ashukumar check this out...
public class Solution {
public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); int rem=0,s=0,t=0; while(n>0) { rem=n%2; n=n/2; if(rem==1) { s++; if(s>=t) t=s; } else{ s=0; } } System.out.println(t); }}
upreti_bhawna Easiest code for the problem. good job!
BansheeGhoul how about this in java .... public class Solution {
public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); int consec1=0; String strBinary = Integer.toString(n, 2); // above is binary of given in in string String[] strparts = strBinary.split("0"); //above we get all strings of ones, below find max from them for(int i=0;i<strparts.length;i++ ){ if (consec1 < strparts[i].length()) {consec1 = strparts[i].length();} } System.out.println(consec1); //result }}
matonte3 That's probably the one that would do better in a tech interview because it actually operates on something that simulates a binary number (a string).
clint_carrion And then they'll ask how to make it more efficient :D
Whilst using split is nifty, it's far less efficient than just looping over the characters yourself.
duchess That's a great idea, I wish I had thought of it. Thanks!
trollol1365 i dont understand how it stops at the maximum consecutive 1
duanjing It does not stop, it goes through all the strings in this sring array such as 1,11,111,1,11,... from the splitting then keep the biggist length.
KrisChow This solution is easy to understand!
gimmick_hina Great!!
abhijit25k String strBinary = Integer.toString(n, 2); Can you please explain this line of code? How 5 is converted to 101 in binary?
almeidah [deleted]almeidah public static void main(String[] args) { int n = scanner.nextInt(); String bin[] = Integer.toBinaryString(n).split("0+"); Arrays.sort(bin); System.out.println(bin[bin.length-1].length()); scanner.close(); }
anirugu can you explain me how 101 is 1 and how 1101 is 2 ?
kevnolf It's asking to print out the largest number of consecutive 1's in a binary number. 101 has at most, 1 consecutive 1's. 1101 has at most 2 consecutive 1's. The binary number 111 will have an output of 3, because there are 3 consecutive 1's. The binary number 111011, will also have an output of 3, because there are AT MOST 3 consecutive 1's.
anirugu Thanks for clerification, now I understand it.
generoustechie Thanks for clarification - but - it does not come out clearly in the way the question is asked.
raheezrahman but still how 101 has atmost 1 consecutive 1's ? ..its 0 ryt?
thakuranikesh191 Binary number 111 will get represented as 8 in decimal not 3 and 1101 has an output of 3 not 2, and that is the reason that 101 has an output 1 cause it has max 1 consecutive 1's. You can also relate it as:-
** Decimal rep = 2^(Max no of consecutive 1's) - 1**
baviskar_pallavi Not sure why your comment is not properly visible to me few of the words are cut short. Can you please explain it agait to me?
h11106298 [deleted]
akashkhobare14 [deleted]
talhaparvez285 CANUPLZZ EXPLAIN THE ABOVE CODE
praneethkumarre1 awesome job mate
VigneshSubu will you pls explain this??
Mtran1092 rem=n%2 checks the state of the bit in the LSB (bit 0). n=n/2 is equivalent to logical bit shift right.
This code is equivalent to the use of left/right bit-shift operators in C++!
himanshusharmah1 Then what is the role of s and t ?
KalyanamKiran t holds maximum s value and s is max no of consecutive 1's. if a 0 occurs then s is reset to 0, but t has highest value of s.
if s is greater than t at anytime during loop then s is assigned to t thus preserving the maximum value of s.
steven_petrov Oh I understand now...the question asks for the maximum number of consecutive ones.
harrybear The best one.....
vshreyasi superb!
VigneshSubu Will You pls explain this ????
rcgonzalezf The same solution with better names:
Scanner in = new Scanner(System.in); int n = in.nextInt(); int counter = 0, max =0; while (n > 0) { int rem = n%2; if (rem==1) counter++; else counter=0; max = Math.max(counter, max); n/=2; } System.out.println(max);
RAhul_Bhatt What is the need of Math.max here?
jerald_fernando He is avoiding the use of if condition.
impex_ua Actually we could do the things a bit more simple here.
Here we totally avoid branching and an extra variable:
while (n > 0) { counter = ++counter * (n%2); max = Math.max(counter, max); n/=2; }
navinxi - *has higher precedence than %, so make it has (n%2)
impex_ua yes, thanks for noticing
zuraassicpark what does it mean
tehwlaknigwnid Brilliant!
dalrawi I really like this solution, I'm trying to figure out why count++ does not work instead of ++count (or count = count + 1)
zykryct ++count increments count before it uses the value. count++ uses the value before it increments count. It can cause errors if you aren't paying attention so I usually just prefix it everytime.
amrinh This solution is really brilliant!
draconiac12 Here is my solution,
String[] binary = Integer.toBinaryString(n).split("0"); int count = 0; for(int i = 0; i < binary.length; i++){ count = binary[i].length() > count ? binary[i].length() : count; } System.out.println(count);
ajay_dayma706 good job bro or sister or whatever you are.
Phamacom80 I like your use of max here. This is called dynamic coding.
alexgiby thanks for the comment
sahilkumark1758 int main(){ int n; int max=0,count=0; cin >> n; int binary[100]; int c=0,m=0; while(n>0){ int i=1; int rem=n%2; n=n/2; if(rem==1){ count++; if(count>max) max=count; } else count=0; }
cout<<max; return 0;}
adarshmr_05 I traced the program but still didn't understand the logic. Can you please explain?
kencluff Nice, I did pretty much same thing but yours is cleaner in terms of putting the max() outside the if/else. Good solution!
elvis_dukaj Ispired to your solution but avoiding
if/elsestatement at all:#include <cmath> #include <vector> #include <iostream> #include <algorithm> using namespace std; int main() { int num; cin >> num; int counter = 0, maxCounter = 0; while (num) { const auto rem = num % 2; counter = (counter + rem) * rem; maxCounter = max(counter, maxCounter); num >>= 1; } cout << maxCounter << endl; return 0; }
ramkumarmichael please explain me this code....
rcgonzalezf It reads the number, checks if it's divisible by 2 since we only have two possiblities 0 or 1, the reminder will be 1 for 1/2 and 0 for 0/2, so since we're counting the max consecutives of '1', the counter is adding itself + 1 every consecutive appeareance of '1', when 0 appears the reminder is 0, and any number * 0 = 0, so that resets the counter, at the end we only save the maxCounter and print the value of the maxCounter. I hope it helps you to understand the code.
irullvandalis If I remove max = Math.max(counter,max); I failed at testcase 2. It result 2 which is the correct answer is 3. anyone can explain me?
virus831 Since the counter is reset after a 0, you save the value of counter in max. otherwise you'll get wrong results. I hope it helps you understand
harrytrandesign So is test case 2 the only one that results in a 0 at the end? I found that without the max the only case that failed was the case for n = 439 which was test case 2.
abhishekraj29011 Thank you,very well explained.
robertv This is probably the best solution here. Good job!
Apollyon2028 counter = (counter + rem) * rem //this to me is beauty;.
Infinite_100p What is const used for in this case? Isn't it normally used to declare constants (i.e., immutable literals)? But you are changing the value of rem with each iteration... I don't understand.
shivamjalkote10 beautiful
gorthiaishwarya what does this line indicate in this code n/=2
elvis_dukaj It means
n = n / 2
harrytrandesign Why did my solution not solve for case 3 without the max = Math.max method called here?
Any idea that would help me learn what the difference of including that check vs not including the check.
zykryct The variable max holds the largest number of ones in a row so far. For example, if n is 11101111, after four loops max will equal 4 for the four ones that are in a row. counter will reset to 0 at the 0 in n and count up to 3 for the three ones in a row but 3 is less than 4 so after eight loops Math.max() will set max to whichever is more, max which is 4 in this example or counter which is only 3.
engineergirl636 OMG my mistake is just to put n greater than 2,not zero thats why test case 2 and 5 are failed ,thanks :),i understood my mistake.
prakriti_k_gand1 [deleted]
boleke What is the difference...
char [] twoBase = Integer.toBinaryString(n).toCharArray(); int counter = 0; int max=0; for(char nums: twoBase){ if(nums =='1'){ counter++; } else{ counter=0; } if(max<counter) max = counter; } System.out.println(max);lampterp You're simply using a built-in function to calculate the binary string. Where's the fun in that? :)
j_keerthana01996 [deleted]robertwilk I would say, if you're going to that, just do:
public class Solution { public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); String[] ones = Integer.toBinaryString(n).split("[0]+"); int max = 0; for (String s : ones) { if (s.length() > max) max = s.length(); } System.out.println(max); } }
aravindputrevu Liked it
anisac Hello, I see that you used the code "for (String s : ones)". Can you please explain what this code does? Thanks
flaviarc1 It is a reduced version of the for loop. Instead of simply iterating through the list, where you'd have to later reference the index to fetch a value, this version directly iterates through the elements of the string.
For example:
List l = ["a", "b", "c"] for (String s : l) print (s);
Output: a b c
tanaymukund HI could you please explain the line String[] ones = Integer.toBinaryString(n).split("[0]+");
rishabhkapri It is spliting the string in terms of zero, i.e, suppose the number was 111011 the the array will be {"111","11"}
chandana204 Hello, I am new to programming. Can you please explain the above program. Thanks
alexgiby good one
alexgiby nice one .
shiprajain1010 hi can you please explain what split("[0]+") does?
shivangi28 That's a commendable code.
shivangi28 Could you explain why did you put [0]+ ? you could have just used "0" String[] ones = Integer.toBinaryString(n).split("[0]+");
janczak_marianna In Python 3 this would be:
n = int(input().strip()) numbers = str(bin(n)[2:]).split('0') lenghts = [len(num) for num in numbers] print(max(lenghts))
haris5 numbers = str("{0:b}".format(n)).split('0')
jappy2002 one line pythonic code:
n = int(input().strip()) print(max(len(length) for length in bin(n)[2:].split('0')))
w8vishal [deleted]devesh1697 [deleted]jagadeesh_py3 count = len(max(str(bin(n))[2:].split('0')))
sancuriousvaibh1 great piece of code.
jae_duk_seo very smart solution.
w8vishal very good logic. thumb up for you.
Dammonoit how about this?
len(bin(int(input()))[2:].split('0'))-1
leocoder Can you please explain these lines? numbers = str(bin(n)[2:]).split('0') lenghts = [len(num) for num in numbers]
Devpatat First, they convert the number to binary. As bin() returns binary numbers but with '0b' as prefix. That's why we only used [2:0]. Now we spilt our number from wherever 0 occurs. e.g. : 1101101110 : [11,11,111] We 'll have a list of this kind, At last we return who has maximum length.
holmes00 Do you mind explaining the second line? numbers = str(bin(n)[2:]).split('0')
kishorjanwade12 can you tell me about this statement ,i mean how it works ...
lenghts = [len(num) for num in numbers]
Devpatat This are one line for loops. It basically returns a list of length of each element in number. e.g. : numbers = [11,1,11,1111,11,1] length = [2,1,2,4,2,1]
It short way to append in a list.
tomazurkiewicz print(len(max("{0:b}".format(int(input())).split('0'), key=len)))
ShixiangWang nice work.
Shi_vam11 can someone explain this code line by line??
Devpatat First, they convert the number to binary. As bin() returns binary numbers but with '0b' as prefix. That's why we only used [2:0]. Now we spilt our number from wherever 0 occurs. e.g. : 1101101110 : [11,11,111] We 'll have a list of this kind, At last we return who has maximum length
pumacens Oh god, such beuty solution... i just complicate myself..
from itertools import groupby max_length = 0 groups = groupby(bin(int(input()))) for group in groups: len_num = len(list(group[1])) if group[0]=='1' and len_num > max_length: max_length = len_num print(max_length)
deepanshubendale whats use of max why its for ? can you give explanation of how this code is executed for string 1111101011 ?
flaviarc1 You need to keep track of the current set of consecutive ones that you are reading, as well as the maximum number ever found. Hence the comparison between max and sum. In your example for 1111101011: sum = 0, max = 0; Reading from right to left you get:
sum = 2, max = 0; // two consecutive 1s is sum > max? Yes it is, set max to sum and reset sum.
sum = 1, max = 2; Is sum > max? No. So max remains as 2.
sum = 5, max = 2; Is sum > max? Yes, set max to sum and reset sum.
Max is now 5 which is the largest amount of consective 1s found.
deepanshubendale thank you for the answer
velzend I was doing the following, but this failed tests >2
110011011100 = [110] +1 (0) [110] +1 [1110] +2 (00) counted 4 consecutive ones. But the answer should be 3.
I really did not get the max of consecutive 1's... Clear now, let me change the code and post it here ;)
You will get 64 bit in two tests.
My code:
int main(){
int n, c, k, current_count, highest_count; current_count = 0; highest_count = 0; scanf("%d",&n); for (c = 63; c >= 0; c--) { k = n >> c; if (k & 1) { current_count++; // printf("1"); } else { // printf("0"); if (current_count > highest_count) highest_count = current_count; current_count = 0; } } // printf("\n"); printf("%d\n", highest_count); return 0;}
avtanshsahai01 sir what does k = n >> c; this statement do?
gvamsi244 Right Shifts 'n' by c times. That is for k=n>>c; // k=n/2^c;
pavn181098 [deleted]
salazar3593 It works only for default test case0. Doesnt work for all. I hava a java solution but also only works for default test case0.
bgseenivasababu [deleted]
deepanshubendale [deleted]
hsultan [deleted]
crick_ Nice One! Awesome!
ryklin why do you need a modulus operator? you should name your variables better so that they are easier to read and understand quickly.
int main(){ int count =0; int max = 0; int n; cin >> n;
while(n){ if (n&1){ count++; } else { count = 0; } if (max < count) max = count; n>>=1; } cout << max; return 0;}
Jinghua Beautiful solution. I love this kind of bit operation.
sxsarkar Awesome solution, liked it
ccarver0 Very nice and elegant.
elsoldollo // slightly modified #include <iostream> using namespace std; int main(){ int n; cin >> n; int cnt = 0, max = 0; while (n) { if (n & 1) { if (++cnt > max) max = cnt; } else cnt = 0; n >>= 1; } cout << max << endl; return 0; }
sindhuchinniah07 elsoldollo! Your code is cool. I can understand. But why have you written this line? if(++cnt>max)
brammi01 can you please explain what n >>=1 means?
shashankcuber i didnt get it why we used this & operator and can u please tell me the concept because i am a beginner coder.cant we do like taking out the remainders and storing it in an array . and then check the no. of consecutive one . please help
RA1611003010504 & was bitwise and here. Your method works in theory but but as seen above, this question can be solved with solutions having far lesser time complexity.
chiranjeet07 [deleted]madhuripatwal08 while(n){ if (n&1){ count++; } else { count = 0; } if (max < count) max = count; n>>=1;// explainnnn plz } cout << max; return 0; }
piyushlionhearts great job
eugine_s Did somebody hear about Java 8 features? See my solution: https://www.hackerrank.com/challenges/30-binary-numbers/forum/comments/159200
CSdisciple I am new to programming and would like to know why do we have the nested if statement assigning s value to t? Couldn't we just print the value of s?
lampterp s is being used to track the current number of consecutive ones. t is being used to track the max. number of consecutive ones. If you simply print s, it wil change in next iteration, and you will end-up printing multiple values. We need to print the final max value. For example: 237 ==> 11101101. Here: s will change in sequence: 0, 1, 0, 1, 2, 0, 1, 2, 3 t will change in sequence: 0, 1, 1, 1, 2, 2, 2, 2, 3
CSdisciple Thank you so much!
j_keerthana01996 [deleted]j_keerthana01996 [deleted]j_keerthana01996 [deleted]ibarry F*cking brilliant M8!
way2gourav91 your program is giving total number of ones. Its not giving highest number of consecutive ones.
lampterp I don't think so. Logic seems correct. s (number of ones) is reset to 0 any time a 0 is seen. Otherwise, if new number of ones (s) is greater than previous highest number (t), t is set to s.
way2gourav91 you can check output by running the program.
Krishna_Yadav Nice Solution ,I tried storing the binary representation of decimal no which is not needed,we just needed to store the higher no of consecutive one's which you did perfectly while calculting the remainders!! Great Job Bud!
vasukapil2196 If the problem was just to display the binary decimals like display 101(5),1101(13) etc.how to store them?
flaviarc1 Not sure what your questions is, but are you just asking how to display binary numbers? Also be careful, there isn't a thing called binary decimals, they're both different bases (base 2 and base 10). Anyhoo, the binary numbers are the actual representation of numbers, so they're naturally stored as binary. If you want to print them out then the easiest way is to use a string, like so:
public static String printBin (int n) { String bin = ""; while (n > 0) { bin = Integer.toString(n % 2) + bin; // store the "bits" in reverse order n /= 2; } return bin; }
tnraghu [deleted]VigneshSubu Will You Please Explain this??
VigneshSubu [deleted]samteck Good approach but can you pleas tell me whats the use of adding this line
if(s>=t) t=s;rahulreddy123 I think for counting purpose.Because every time else block executed s value set to zero.so count value was stored in another variable t.
nitasha beauty :)
btmoulton why doesn't mine work then? Seems the same to me...
int main(){ int n,x,count,max; scanf("%d",&n); x=0; max=0; count=0; while(n){ x = n%2; n = floor(n/2); if(x==1){ count++; } else{ if(count>max){ max=count; } count=0; } } printf("%d",max); return 0; }
vanshika_bhardw1 [deleted]abhinav_maurya7 [deleted]abhinav_maurya7 need some modification. If you watch closely you will find the problem
int main(){ int n,max,x; max=0; int count=0; scanf("%d",&n); while(n>0) { x=n%2; n=floor(n/2); if(x==1) { count++; } else{ if(count>max) { max=count; } count=0; } } if(max>=count){ printf("%d",max); } else { printf("%d",count); } return 0; }
a_lathashree Brilliant
15131A1284_meera int main(){ int n,a[20],b[20],i=0,j=0,k=1; scanf("%d",&n); while(n<=2&&i<20) { if(n%2==0) { a[i]=0; n=n/2; } else { a[i]=1; n=(n-1)/2; } i++; } for(i=19;i>=0;i--) { b[j]=a[i]; j++; } while(j>19) { if((b[j]==1)&&(b[j]==b[j+1])) { k++; } j++; } printf("%d",k); return 0; }
can u help me with my code??
mirna_alkhoreby can any one explain this code please, I think I'm lost in all these conditional statements, why do I need to check if count is greater than maximum twice?! why maxCounter change its value many times? is that thing deals with the compiler and dynamic memory allocation?
maxwell_mckinnon This is exactly what I did. Wondering why this wasn't in the solution.
n%2 n=n/2
Keep track of the biggest rem == 1 streak.
Great job.
praveen954kumar [deleted]shanavas Bit shift version
#include <iostream> using namespace std; int main(){ int maxOnes = 0; int ones = 0; int lastBit = 1; int n; cin >> n; while (n != 0) { if (n & lastBit) { ones++; if (ones > maxOnes) { maxOnes = ones; } } else { ones = 0; } n = n >> 1; } cout << maxOnes; return 0; }
vyom_shah98 In this program what "&" stands for which is in the statement if(n & lastBit)???
tejaskochar95 what does this line mean if (n & lastBit)
skshtripathi Woa!! I am still a beginner and now I am cursing my long code! Thanks alot!
yobibytes Try the toBinaryString function in Java. Here is a scala one-liner:
Integer.toBinaryString(n).split("0+").sorted.last.length
Ambrogio good job! this is simplest program.
shweta_ar Wow this really is the simplest one. Thanks :)
akshay_jangid05 superb
amit_samanta Please, let me know how you were able to pass the Test Case# 2. I am trying to submit the code, it gives a message the test case 2 failed. I check the Expected Input and Output of the Test Case, they are incorrect, means, expected output value is incorrect.
jybaek Reread the problem.
Print a single base-10 integer denoting the maximum number of consecutive 1's in the binary representation of n.
anusha_manne what is test case 2 ?? Against wich value tested? any one help me
jp9573 Great!!
amitcode563 great, most simple code.
muzic_maniac7 Great job! But to print the correct output you need to check if(t>s) then print t, else print s.
subh_007 @ashukumar, Suppose if you just don't have to count the contiguous numbers instead you have to make an method which takes int as input and then returns binary to the input, and somewhere it should also print the trailing occurence of 0s or 1s.
chintareddyavin1 But why this programm can't satisfy the test cases on numbers 439 and 65535.
dcfaber84 In cases where the final continuous series of 1's was the longest (or the binary representation is all 1's) do you have a final check after your loop and before printing which is larger, max or the length of the current sequence?
vijayanand_mit make sure, the max variable is printed. i had similar issue for 439
mpocatko you don't need to hold rem in memory, you can also replace costly % and / operations with a simple & and >> bit operations
pavithra_sri7 I'm new to progarmming..pls explain the code...from s++
steven_petrov I'm having trouble understanding why this work. For example, let's use the number 65. It's greater than 0 so the while loop starts.
rem = 1 n = 32
And then the if statement executes. And because S goes up from 0 to 1, t becomes 1.
But the second time around 32 is divided evenly and REM = 0. Doesn't this mean that the else statement executes and s = 0. So every time there is a 1 it gets stored in T. If there are two 1's then 2 increments by 2.....
Is that correct?
so 101101 Would produce 4?
Forgive me if I'm dense.
Shubha_sundaram [deleted]
sahurishabh969 This code will give wrong output when n=439.
vijayanand_mit did you print the max variable?
leoisyan Man this is complecate! I dont get it!
amarvadla27 in java style
public class Solution { public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); String k = Integer.toBinaryString(n); char[] binary = k.toCharArray(); int count=0,max=0; for(int i=0;i<binary.length;i++){ if(binary[i]=='1') count++; if(count>max) max = count; if(binary[i]=='0') count = 0; } System.out.println(max); } }
d_michael_harris Thanks! This one worked the best at making me understand the solution.
koselev Your code inspired me for the following solution in Groovy:
int n = (new Scanner(System.in)).nextInt() int max,overAllMax = 0 while(n>0){ if(n%2==1){ max++ overAllMax = Integer.max(overAllMax, max) } else { overAllMax = Integer.max(overAllMax, max) max=0 } n=n/2 } print overAllMax
Spiznak Probably should only check
overAllMaxin the increment max branch of youriftree. It doesn't need to be done for every iteration.
hshimanshu73 good job dude you nailed it ..!
presiyang [deleted]Spiznak You could reduce memory slightly by leaving out the declaration and assignments of
remand just use then%2==1condition in the firstifstatment.Also, it would reduce the checks against your max if you nested that check into the increase max branch of your
iftree.Minor changes, but could potentially go a long way in real world complex computations, particularly if you can eliminate this need in multiple areas.
daiict_201712052 M gettine error when input is 439
BansheeGhoul Hello this is the smallest and easiest code in java:::: public class Solution {
public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); int consec1=0; String strBinary = Integer.toString(n, 2); // System.out.println("Binary equivalent: "+Integer.toString(n, 2)); String[] strparts = strBinary.split("0"); for(int i=0;i<strparts.length;i++ ){ if (consec1 < strparts[i].length()) {consec1 = strparts[i].length();} } System.out.println(consec1); }}
vippayne [deleted]Asami Thank you soo much
prasannakandreg1 brilliantly written.
Ajay_EEE19 is that else loop is required??
j_wilson3355 If you want more performant code you should change from using modulo to being a bitwise & operator (it is faster than modulo and will do the same thing).
anupjee608 well done
bdiaconu :) I had same idea. - noticed the count for 1101 is the same as for 1011
n = int(raw_input()) c=0 max=c while n > 0: x=n%2 n=n/2 #print x, if x == 1: c+=1 else: c=0 if c > max: max = c print max116cse_rec explain the code plz.
zuraassicpark timeout...
AishvaryaSivaram i have a doubt ! is this a recursive process or iterative ? how do mod and divide does after each operation ? it goes inside loop fpr one time only ! right
AishvaryaSivaram plz explain ?
aamnasharma112 Nice! Btw how do you think such logics? :p
punjprakash You dont need if(s>=t), only if (s>t) will work ( eliminating "=")
rockey20 Simply!! Great Code. Clean and easy. Nice thinking..!
edrouwendaal single line C#:
Console.WriteLine(Convert.ToString(Convert.ToInt32(Console.ReadLine()), 2).Split('0').Max(m=>m.Length));
niohack So simple! I just adjusted mine, thanks!
anchalesh10 thanks for the help buddy i thought the same logic but implemantation problem as usual to me
osama119786 great!
talhaparvez285 cann u pLZZZ EXPLAIN IT...I CANT GET IT
osama119786 what u didnt get, exactly?
kristalknight18 Python3: for those that don't understand the one liner print(len(max(bin(int(input().strip()))[2:].split('0'))))
for sake of explenation im going to replace input() with '13' and break the code down.
1- int(input().strip()) ==> int('13'.strip()) takes the input of the number and strips any spaces on either side, then converts it from a string to an interger. the result is the interger 13.
2- bin(13)[2:].split('0') ==> the bin() method takes a number and converts it to binary. in this case when you enter bin(13) it returns '0b1101'. the [2:] allows us to omit the '0b' at the beginning of the string. which leaves us with '1101'.split('0'). This string method takes '1101' and splits it into a list. We end up with ['11','1'].
3-len(max(['11','1'])) ==> the max() method is simply going to look for the biggest value. In this case the biggest one is '11'. '11' is passed to the len() method which just returns the length of the object in it. In this case the object is the string '11' which has two characters, so len('11') returns 2. Which in turn is also the longest consecutive amount of ones.
flame233 Thank you.
arnauddesombre The 1 liner gives the correct result, but creates a non satisfactory intermediary list:
"11001".split('0') returns ['11', '', '1']
However, the desired list is the list of all 1s and should be ['11', '1']
we need to split with 1 or more consecutive 0s:
re.split("0+", "11001") returns ['11', '1']
which is a better list (you could use it to answer questions like: how many blocs of consecutive 1s are there in the binary representation?)
the one liner becomes:
print(len(max(re.split("0+",bin(int(input().strip()))[2:]))))
parth83_rawal we can also use "{0:b}".format(n)
andregs Nice! JavaScript version:
Math.max(...Number(n).toString(2).split(/0+/).map(e => e.length))
m0026 nice!
can you explain this?
m0026 [deleted]
stroncis Good answer, but uses spread/rest operator "..." and arrow function "=>", which are supported just from ES6, so this solution have less compatibility without shims. If you want to better understand, how it works, dissect to chained elements: Math.max(
...
.Number(input)
.toString(2)
.split(/0+/)
.map(e => e.length)
)The main idea here is (how i understand, please correct me if wrong):
First to convert input to number, but in case you are sure input is number, no need for Number().
Then toString() with parameter "2", which outputs representation in binary.
Then split output with regex to groups of ones.
Then with map() method creating new array with lengths of ones. This map prototype have less compatibility too.
Finally Math.max is wrapping all this and returns highest number from final array.
Now all the "looping" is done by spread operator and arrow function, which are new in Javascript, they are the main "secret" ingredient here.
thompson0005 trully amazing
d80b2t Explanation (sp.).
jianghaoyv nice code and good explanation. thumb up
atheis4 Beautiful. Love these python3 one liners!
bradywalsh I did mine exactly the same way in Ruby, but I think it is less confusing to read.
puts gets.strip.to_i.to_s(2).split('0').max.length
danielsinferno nice, you can save 2 chars using .size instead of .length ;)
canhascodez If we're golfing it, then:
$><<$_.to_i.to_s(2).split(?0).max.size
run with
ruby -n. Usingstriporchompis unecessary if you're usingto_i. The line noise at the beginning is:$> # synonym for STDOUT << # shovel operator (appends things) $_ # first line of input
Code golf is probably bad for the brain.
arkchib Why are you using split(?0) instead of split('0'). This is an unfamiliar syntax for me.
canhascodez The unary
?operator produces a single character string in Ruby 1.9 and above. In previous versions it would produce the ASCII value for a character, so?d #=> 100. Frankly it's an obscure bit of syntax that has no purpose beyond code golf.
uthap_jhojho Awesome algorithm. Thanks for the share
johannesknopp print(len(max(re.compile("(1+)*").findall(bin(int(input()))))))
My solution
PierceofCake Thank you for this explanation. I'm new to programming and still struggle with coming up with short and simple solutions like this. Now I know there's a method for converting numbers to binary in Python!
My solution is embarrassingly long at 41 lines of code, may not be "Pythonic" or elegant, and may even be considered brute force, but it seems to have passed all of the test cases. I know that Python has a lot of extremely useful things already built into it, but as a beginner, I'm finding it more useful to break down the problem and figure out how to get from A to B using what I already know.
Then, once I've come up with my own solution (inefficient though it may be), I take a look at what others have done and end up discovering new and powerful ways to do things in Python. It's one of my favorite things so far about learning how to program.
If anyone has any advice on how to clean up my code or make it more efficient, I'm all ears. I'm sure I won't be able to produce any of these amazing one-liners anytime soon, but I hope to get there someday.
#!/bin/python3 import sys import math n = int(input().strip()) # create an empty list to hold our binary numbers binary_list = [] # fill the list with 1s and 0s from left to right using Base-Conversion Method (remainders of dividing by 2) while True: if n > 1: if n % 2 == 0: binary_list.append(0) elif n % 2 != 0: binary_list.append(1) elif n == 1: binary_list.append(1) break elif n == 0: binary_list.append(0) break n = math.floor(n / 2) # set a counter and a max variable consec = 0 maximum = 0 # iterate through our list of 1s and 0s to find our max consecutive set of 1s for i in binary_list: if i == 1: consec += 1 if maximum <= consec: maximum = consec else: pass elif i == 0: consec = 0 print(maximum)
kanakidim Shorter way to get the binary list:
n = int(input().strip()) binary = [] while n > 0: remainder = n%2 binary.append(remainder) n = n//2 print(binary)
smartrahul1999k1 Use bin() function......
ritikaupadhyay_1 if maximum <= consec: maximum = consec
I was wondering if you could explain this bit to me. Kinda new to the language and quite lost.
Thank you!
robbiesoho For every '1', 1 gets added to consec, which counts our consecutive 1's. When maximum is less than consec, maximum takes on consec's value. When the function encounters a zero, consec goes back to nil but maximum keeps it's value. Maximum changes value everytime it is less than consec.
vishalsuryavans1 thank you . awesome code with extraordinary explanation ..looking forward for such kind of code explanation thanks in advance. It will be very helpful if you tell me from where did u learn python .
suplex_city1 [deleted]
ytian3 The pythonic way!
hafee_theblue thank you
krhimanshu1996 beautifully done.
prashantchikhal1 For those using C as programming language,
int main(){ int n; scanf("%d",&n);
int count = 0; while (n) { n = (n & (n << 1)); count++; } printf ("%d\n", count); return 0;}
omagasohe This is pretty cleaver. Took me a minute or to to figure out why it works. For those that want to learn it's in how the & operator works
say we start out with 5869
5869 = 1011011101101 <<1 = 0110111011010 & = 0010011001000 = 1224 <<1 = 0100110000000 & 0000010000000 = 128 <<1 = 0000100000000 & = 0000000000000 = 0thats 3 cycles. which is the answer. I love simple elegant solutions. too many of the newer languages have too many steps.
lampterp Thanks for the explanation!
Clever indeed, but intuitive no. :)
aelzeul I like this solution too. It is fast and actually readable. But it is not language-dependant at all. Any normal language has bitwise operations.
The same in python3:
n = int(input()) count = 0 while n: n &= n << 1 count += 1 print(count)
slachz That's super clever, awesome !
kasunv yea its wonderful way..can you tell, how to approach this kind of method??
msidargo THIS IS BEAUTY
riatiger Very good application of base binary logic operations.
sab3awy_meso but that isn't the maximum number of consecutive 1's in n's binary representation !!!!!!!!
kbenriquez Very clever solution!
ali_roustaei Simple way for Python3:
print(len(max(bin(int(input().strip()))[2:].split('0'))))raptor985 Simple, but not much readable. If few lines of code, instead of one, can be more descriptive - there should be few lines. But, yes, one-liners on Python look impressive.
ali_roustaei You're right :)
JKDos This is raptor985
raptor985 cares more about writting readable code than short code.
raptor985 is smart
be more like raptor985
ali_roustaei You are right! :D
tejas3294 def func(num): return num[2:] n = int(input().strip()) a = max(func(bin(n)).split('0')).count('1') print(a)
bhattacharya_pr1 How does the following line work? And what is count('1') used for? a = max(func(bin(n)).split('0')).count('1')
varun_pikachu Using in-built function bin() followed by string processing AND max(iterable) is overkill and inefficient for this problem D:
ali_roustaei just for fun!
wittrup What efficient python solution do you suggest?
dennis_addo i did this in python 3 just one line
print(sorted(list(map(len,'{0:b}'.format(int(input().strip())).split("0"))),reverse=True)[0])
budnikav86 Wow! Great idea to split string into substring. Thanks for sharing it.
yushan Thank you! I did this in python 2;
import sys n = int(raw_input().strip()) print max([len(x) for x in '{0:b}'.format(n).split('0')])
babayaga321 can you explain the code? how does it convert the number to binary?
PS-im new to python. so many functions here!
kurian_benoy What is use of .format.Pls explain?
TMWP01 [deleted]
intelligent_fun1 I can't this to work, what did you do?
yeoman fuck off python :)
Moulick Come join the Python masterrace. huehuehue
tuhinbc2 Why? You mean that creature python, right?
thomasokonkwo91 Hahahahaha you are funny.
thomasokonkwo91 Hahahahaha you are funny.
dennis_addo //python 3 making it readable and less print(sorted(list(map(len,'{0:b}'.format(n).split("0"))),reverse=True)[0])
Moulick I find @ali_roustaei method more easier to read btw.
Please also explain yours @dennis_addo, I would love to understand it
dimm_ddr I think max() is better then sorted(list()). Sort is usually O(n log(n)) and can be better only in very specific cases, while max is O(n) always.
Moulick using format(input(), 'b') would have directly given binary without 0b.
Awesome job.
lukewrites Another one-liner:
print(max(bin(n).strip('0b').split('0')).count('1'))Not very readable, but: Use
bin(n)to turn it into binary,strip('0b')from the front,splitthe number at each 0, leaving you with just strings of 1's.
Take themax(biggest) string of 1's, and thencounthow many 1's are in that string.
rhymefororange Also, you can use len() to count ones. Since we are sure that the string only consists of ones, we can count it’s length, because it’s more generic.
print len(max(bin(int(raw_input())).strip('0b').split('0')))
henryjahja import sys print( len( max( bin( int( input().strip() ) )[2:].split('0') ) ) )
Haha. Also, impressive one-liner! Great job!
TMWP01 wow. there was another one on here that needed a list comprehension to do this. Your answer is cleaner and simpler. I did not think of this combo and did it with loops and counters:
import sys n = int(input().strip()) tst = str(bin(n)) tst = tst[2:] ones = 0 maxOnes = 0 for i in tst: if i == '1': ones += 1 if maxOnes < ones: maxOnes = ones else: ones = 0 # reset ones when 0 encountered print(maxOnes)
tmafonja1 brilliant!
joshisanket126 the ordering of the if statements must be changed.
if i =='1': ones=ones+1 else: ones=0 if maxones<ones: maxones=ones print(maxones)
ahmettortumlu25 Brillant!
edlaierii C# like most, but just transform the array to one of lengths and take max.
static void Main(String[] args) { int n = Convert.ToInt32(Console.ReadLine()); var b = Convert.ToString(n,2); string[] arr = b.Split('0').ToArray(); int c = arr.Select(x => x.Length).Max(); Console.WriteLine(c); }
sadatshahriar can u please explain string[] arr = b.Split('0').ToArray(); int c = arr.Select(x => x.Length).Max(); part .
edlaierii my comment wasn't enough to explain? The split separates all the numbers, discarding the 0s. there using the Select method, which transforms, to create a list of ints based on length. finally taking the max of those numbers.
salazar3593 Not readable. Not elegant and not a single comment. Thats why it needs explanation.
edlaierii First off if you need comments for what each line does you need to go back to programming 101, because you have no clue what anything is doing. Comments are for keeping track of processes you are doing within a program so someone coming in after you knows what it is the lines are of code are there for. The only reason I post my solutions is for others to compare their "working" solutions, or figure out why their solution is failing.
salazar3593 Well if i dont know the language your using then maybe a comment would make me wanna be interested in reading that persons code. Just an idea im passing onon please dont bite my head off again.
broodwar1998 I code in C# so I fully understand this. Other languages unfortunately do not get the luxury of LINQ. I started with Python 3 and laded my journey with C# recently (2 years ago). Others may imply things differently, we cannot discriminate between views here. If they are new and do not understand coding, it is still helpful in their learning process to have been explained why something was done this way. In most languages you would have to do the logic yourself where as luckily in C# we've been given libraries to assist in this. Please be kind even when you feel others don't deserve it, not for them, but as a relection of yourself.
allan_registos The confusing line here is this:
int c = arr.Select(x => x.Length).Max();
The arr.Select needs explanation to new or non C# programmers.
j0etk A long but easier understand approach , perhaps ...
static void Main(String[] args) { int n = Convert.ToInt32(Console.ReadLine()); int Quotient = n; int Remainder = 0; string BinaryValue = ""; while (Quotient > 0){ Remainder = Quotient % 2; BinaryValue = Remainder.ToString() + BinaryValue; Quotient = Quotient / 2; } Console.WriteLine (CheckConsecutive(BinaryValue)); } static string CheckConsecutive(string BinValue){ int HighestConsecutive = 0; int CurrentConsecutive = 0; for (int i = 0; i < BinValue.Length; i++){ if ( BinValue.Substring(i , 1) == "1" && i != BinValue.Length - 1){ CurrentConsecutive++; }else { if (i == BinValue.Length - 1 && BinValue.Substring(i , 1) == "1"){ CurrentConsecutive ++; } if (CurrentConsecutive > HighestConsecutive){ HighestConsecutive = CurrentConsecutive; } CurrentConsecutive = 0; } } return HighestConsecutive.ToString(); }
somdipdey amazing logic, mate! cheers
somdipdey The same logical implementation in scala but without using linq (scala doesn't have linq though) and lambda :
object Solution { def main(args: Array[String]) { val sc = new java.util.Scanner (System.in); var n = sc.nextInt(); var temp = n.toBinaryString.toInt var listOfOnes = temp.toString.split("0").toList println(listOfOnes.max.size) } }
broodwar1998 [deleted]
starglider Same thing, written in a shorter way:
static void Main(string[] args) { int n = Convert.ToInt32(Console.ReadLine()); Console.WriteLine(Convert.ToString(n,2).Split('0').Max(s=>s.Length)); }
BinaryTrance Unfortunately, I don't understand the meaning of "consecutive 1s". Doesn't consecutive 1s mean occurence of a 1 right after another 1? for example, If the number is 101, shouldn't the number of consecutive 1s be 0 since there are only two ones and they are separated by a 0?
lampterp Confusing indeed, but here "consecutive 1's" simply means a series of "one or more 1's with no 0 in between".
Hence, max. no. of consecutive 1's in 101 is said to be 1.
dzkangshu my solution:
n = int(input().strip()) cons_one = bin(n)[2:].split('0') print(len(max(cons_one)))
venkatesh_manoh1 public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); sc.close(); int count = 0; int tempCount = 0; while (n>0){ int remainder = n%2; n= n/2; if(remainder ==1){ tempCount++; if(tempCount>count){ count = tempCount; } }else{ tempCount = 0; } } System.out.println(count); }
Ramanuja_08 why should we use if(tempCount>count){ count = tempCount;
coder_aky 100 % working ,Simple and easy :-)
Here's in Python 3
print(len(max(bin(int(input().strip()))[2:].split('0'))))
working : let input :13 then
print(bin(int(input().strip()))) :gives: 0b1101
print(bin(int(input().strip()))[2:]) :gives: 1101
print(bin(int(input().strip()))[2:].split('0')) :gives: ['11', '1']
print(max(bin(int(input().strip()))[2:].split('0'))) :gives: 11
print(len(max(bin(int(input().strip()))[2:].split('0')))) :gives: 2
adhikari_riya Using JavaScript we can do it fairly simply.
function main() { var n = parseInt(readLine()); var count = 0; // to give an array of 1s var BinArr = n.toString(2).split('0'); // if you are not using ES6 the you can also do this // var max = Math.max.apply(null, BinArr) var max = Math.max(...BinArr); console.log(max.toString().length); }
arninho Don't need to use the line:
var count = 0;
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