JoshuaLamusga I don't think that this problem needs to exist because it's redundant with the simple array sum challenge. All I did was change
sum's type frominttolongin Java, and the challenge even told me how.
diegovicen I completely agree with you. I am using Python, and all I had to do was copy and paste.
VRatr This was not the case in C++ if you're using accumulate().
long long int total = accumulate(arr.begin(),arr.end(), 0);which appears to overflow. I just iterated through the elements in a loop and summed the total instead.
gautam11681 Have you figured out why this happens? I even tried passing a custom function to do the addition and still it overflows!
razor123 The problem isn't meant to be solved using long integer. Use integer datatype to solve it. You may divide the bits and then add them seperately.
gautam11681 well i think you are forgetting about kiss
havoklord It is a problem that can be solved however you want. But if you look at the hint "When we add several integer values, the resulting sum might exceed the above range. You might need to use long long int in C/C++ or long data type in Java to store such sums. " It would contradict what you said.
alextaylor Because the type of the accumulator that will be used to determine the sum is based on the type of the third input argument. The literal 0 is not being interpreted as long long int. If you cast the initial value to accumulate appropriately, you get the right answer.
accumulate(arr.begin(),arr.end(),static_cast<long long int>(0))alextaylor From http://stackoverflow.com/questions/8108642/type-of-integer-literals-not-int-by-default
"The type of an integer literal is the first of the corresponding list in Table 6 in which its value can be represented."
And Table 6, for literals without suffixes and decimal constants, gives:
int long int long long intSo, without the cast, the literal 0 can be represented as int, so accumulate uses int as the type for accumulation.
geodoom I think there is another way , to avoid the static_cast(0) , and do it by simply accumulate(....,0L); If I remember correct (I am too lazy to search in books or google now to verify!) the L forces the number to be interpreted as long long.
Gamenot L is the suffix for long just like LL is the suffix for long long. Weird but not confusing.
accumulate(....,0LL)avoids the static cast.
C_jain or we can do it more simply like this..
accumulate(arr.begin, arr.end(), (long long int)0);
trungskigoldberg Hi, I understand the 3rd argument of the function accumulate(), which indicates the type of integer literal in this case. But why we need to cast statically as
.....static_cast<long long int>(0))
for the long long integer?
C_jain i also don't know that why i cast it explicitly
dinaelhanan I am having trouble grasping a clear definition of initial value. What would that mean?
Kanahaiya you can check out the below link for video explanation :)
dinaelhanan thanks!
getarqamnow Thanks
Kanahaiya most welcome..:)
Kanahaiya most welcome..:)
Vidya35 long int result=0; cout<
This works for me in C++. No overflow.
msaad1200 return accumulate(ar.begin(), ar.end(), 0ll);
notice the ll after 0
dinaelhanan just wondering, why is the initial value 0ll? What does that mean? I have done a search on it and all I am understanding is that the double L means long long. Also, I am having trouble understading a clear definition of initial value. From the tutorials I see, it looks like the value before the first value in the array or vector. Is that wrong?
QuantumTourist You can solve this issue with ease. The pitfall with accumulate is that it assumes the return type to be the type of the initial value of the sum ( the third argument passed to accumulate ) so , this would work :
long long int total = accumulate(arr.begin(),arr.end(), long long 0); or long long int total = accumulate(arr.begin(),arr.end(), 0LL );
terenceponce Same here with Ruby. I had to re-read the problem just to make sure that I wasn't reading the same thing.
mraemiller I tried it in pure C ...a world of pain! But here's the answer
int main(){ int n; long bign = 0; long bignn; scanf("%d",&n); long arr[n]; for(int arr_i = 0; arr_i < n; arr_i++){ scanf("%li",&arr[arr_i]); } for(int arr_i = 0; arr_i < n; arr_i++){ bign = bign + (arr[arr_i]) ; } printf("%ld\n", bign); return 0; }
ranju73 wow!
tej005 cool!! was missing 'li' and 'ld' in the scanf statements...'l' for long..!! thank you.
amantoor Thanks!
mickey_sweety not working
somayaji What's the reason for using two loops and an array? I feel like that just takes too much time and too much space. Here's my take in C if anyone's interested:
#include <stdio.h> int main(void){ int n; long sum=0; scanf("%d", &n); long value; //long arr[n]; for (int i=0; i < n; i++) { scanf("%li", &value); sum += value; } printf("%li", sum); return 0; }
apschauhan700 see full and easy to understand code on:
https://github.com/akkshaychauhan/hacckerank-code/blob/master/Algorithms:A%20Very%20Big%20Sum
thatsmemohit Not working ...is there any place where I can see answers ?
apschauhan700 Try long long int in place of int if you are using c
satyamskillz take value as value[] it will surly work.
Kanahaiya you can check out the below link for video explanation :)
158r1a04g3 thanks buddy , i learned something from your program :-)
Kanahaiya I am glad to know that my work helped you in your learning.
vaasishteja thank you it worked
uniyalhimanshu08 but if we intializing array in long type after then we are inputing it and summing it then it is showing runtime error.. can you tell me why this happening or i am wrong??
180330049_CSE_A I want to use functions in it . Can you give me the idea of it.
Kanahaiya you can check out the below link for video explanation :)
avinashraj2109 It will only run for numbers less than 10 digit not more than that.
NiharPawade "a world of pain" - completely agree with you.
nikhil_lagwanka1 Does this work if you put the sum part under that function they have provided
akshaya1833 THanks dude
eavestn I'm sure there's some fancy "stuff" you could do in a strongly typed language to determine the type of the result; however, I wonder what the performance implications of that would be versus just starting with type long. Don't know why you got downvoted (I don't write in Python).
ggiesawilson Yeah, it seems like the utility of the problem is language dependent. Python 3 doesn't differentiate between int and long types; they're handled exactly the same way from the users perspective.
scotmatson Yeah but your missing the point. Firstly a number of people are coming here with little to no experience and this is great practice for them.
The problem is clearly labeled as being easy, however maybe that didn't exist 2 years ago when this post was made.
And for people with more experience, it is an opportunity to play around.
Case in point:
def aVeryBigSum(n, ar): return reduce(lambda x, y: x + y, ar, 0) def reduce(func, arr, s): for v in arr: s = func(s, v) return s
mohankrishnann61 please !!! can you explain the code. which you provided here.
sravanamrajesh1 super
tarunbinwal805 sir can you plz help me in this my code is not running it is showing indentation error at the if--main--- line but i think the indentation are correct ............
DavonJG I didn't know long existed until this challenge...my teacher seemed to just have skipped right over it.
tanuj22333 [deleted]
tobywhughes I think it is useful at a basic cs level. The size of domains for different data types seems to be largely skimmed over in introductory cs classes.
Edit: Granted, in python int and long have been unified since python 2.4 so it was the same code
cli__ Yeah, I use bash shell and in bash variable has no type and can always use the largest integer.
nishant021088 could you please let me know how you did it? i am trying in bash,no success yet.
juan_villgs yep, just remove it..
mithuntnt Python 3 automagically supports indefinitely large interger operations.
rk235927 long result=0; long value=0; int n; Scanner scan=new Scanner(System.in); n=scan.nextInt(); for(int i=0;i
System.out.println(+result); } }
kesarims1 This challenge should be the very first challenge in the series.
sohamzemse Yea, in Swift I just had to use reduce property of an array and just returned it as a one liner.
return theArray.reduce(0,+)
righteouschica2 This depends entirely on what language you're using.
Ani_singh yeah...just had to change the datatype.... anyways if any1 wants.....
// Complete the aVeryBigSum function below. static long aVeryBigSum(long[] ar,int arCount) { long sum = 0; for (int i = 0; i < arCount; i++) { sum+=ar[i]; } return sum; }
petartopvn same code, throws java.lang.NullPointerException ((
Kanahaiya Hello Coding Lover,
If you are looking for solution of hackerrank problems you can checkout the below link https://github.com/Java-aid/Hackerrank-Solutions.
It contains text solution as well as video explaination. Still there are many more solutions are in queue which needs to be added.
And if you are preparing for coding interview feel free to join out community here https://www.facebook.com/groups/codingip
Regards,
Kanahaiya Gupta
Git Hub URL | https://github.com/Java-aid/
LIKE US | https://www.facebook.com/javaaid/
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_JSon Exactly, the sum method in python does the same thing. I just typed return sum(...)
gangavaram123 with open('D:/INC/R/Python/long_num.txt') as a: d=0 b = a.read() e = b.split(" " )
for i in e: e1 = int(i) d = d + e1 print(d)
H4DH1 For people posting their codes, hit enter and tab the first line so it would look coherent.
{ CODE Like this }{ not like
this}
mramitkumar95 well, H4DH1 Although it might be your personal preference but the way
{not like
this} is industry standerd. So you should follow that, bcoz that will make ur life easier.MandoPelando That's not industry standard. H4D1 is correct. The way you have it gets really ugly and hard to read, so I would recommend you follow H4D1's recommendation; It could save you a lot of frustration.
sumitrai01 I agree, H4D1 is right. Properly indented code is more readable and maintainable. Now as far as standards are concerned, the classic The C Programming Language (Ansi C Version) by Kernighan and Ritchie recommends H4DH1's style.
eavestn It's not "industry" standard: it is language, company, and - sometimes - even product influenced (notice I didn't say determined). The spacing of a language's brackets is entirely preference-based, even if coding conventions are encouraged by documentation (such as MSDN, Oracle, etc.). I've seen some bad stylings in my short time as a programmer.
MobilityWins This is actually worse and should not be an industry standard, this is how you get whats called "spaghetti code" because havign a lot of lines in this fashion will just look to jumbled and harder to debug.
tricerabottoms "Spaghetti code" refers to the look of the dependency graph, not the code.
MobilityWins Actually it's both.
waspnx [deleted]
misoknr One thing is there is similar "challenge" already, although in this case number may be large, that's fine. It is EASY, but why would you give solver a hint about using specific type? Isn't it a point of a challange to find out for yourself that you need to use type that can hold large number? By revealing this in note, solving it is pointless. And this plagues many of the challenges here. Why give solver all the necessary hints right away is beyond me.
benjamin_van_ng1 My python 3 solution:
def aVeryBigSum(ar): res = 0 for i in range(len(ar)): res += ar[i] return resvitaliis This prints only a list. Input 2 111 222 Output: 111 333
Pradi_smg7 return sum(ar) is suffice.
kushal14822 python 3:
def aVeryBigSum(ar):
return(sum(ar))
KeshaCoder I'm new to HackerRank--why is there already code in the solution window? Shouldn't we be coding things from scratch?
zazaalaza I think it's because of how you get the data from the input, instead of you declaring it?
tgamerkle The code in the window is what the HackerRank server runs. You will write your code in the important-looking function that's mostly empty. ("main", or something). There might already be code there that declares some variables for you to use (like "arr" for an array of the numbers).
marinskiy Here is Python 3 solution from my HackerrankPractice repository:
n = int(input()) ar = list(map(int, input().split())) print(sum(ar))
Feel free to ask if you have any questions :)
dariolionel gives me error don't know why
marinskiy probably you using Python 2 instead of Python 3
adarshkumar9610 int object is not callable
Zystx JS has a pretty one liner for this.
let result = arr.reduce((previous, current) => previous + current , 0); console.log(result);alexmeneses90 I had a very similiar answer.
console.log(arr.reduce((prev, curr) => prev + curr));
k_bazaraly This is awesome. Can you hint me where I can read more about operator
=>? Googling is not helpfulalexmeneses90 It's part of the ES6 standard you can check out some documentation and examples here MDN LINK
gene68 Same in C# LINQ: var sum = arr.Sum(a => (long) a);
charlie861i You can cut this down evern further, simply
static long aVeryBigSum(int n, long[] ar) { return ar.Sum(); }
tommasobertagnin Yes in JS it is a breeze to solve. These problems are really concerning those low level languages, like C, where even doing the most simple thing requires skills :)
navindrenjr Can be done in python as well
print reduce((lambda x, y: x + y ), arr)zyanting18 could you explain what this line is doing please? Thanks
baojianfei1208 at python3, you net add import as follow: from functools import reduce
jamesanon00000 [deleted]saimadhukar print sum(ar)
tricerabottoms That's neither a one-liner nor a correct solution.
5 9007199254740992 1 1 1 1
subas113 Solve in C#
using System; using System.Collections.Generic; using System.IO; using System.Linq; class Solution {
static long aVeryBigSum(int n, long[] ar) { // Complete this function Int64 total = 0; for(int i=0; i < n; i++) { total +=ar[i]; } return total; } static void Main(String[] args) { int n = Convert.ToInt32(Console.ReadLine()); string[] ar_temp = Console.ReadLine().Split(' '); long[] ar = Array.ConvertAll(ar_temp,Int64.Parse); long result = aVeryBigSum(n, ar); Console.WriteLine(result); }}
hamann_james87 For the test cases privided it does, but what if the integers are incredibly long? JS can't handle integers with more than 15 characters, and returns approximations. You need to import a library like big-num or write a very complicated workaround to deal with large integers.
brian___96 [deleted]
chaitu532462 include
int main() { long int arr[20],sum=0; int i,n; scanf("%d",&n); for(i=0;i
bryank Just works in javascript...
function aVeryBigSum(ar) { return ar.reduce((c, i) => c + i, 0); }
apolo4pena [deleted]
abaklanov Just a small note. You can skip the last param for reduce():
function aVeryBigSum(ar) { return ar.reduce((acc, cur) => acc + cur); }bryank Indeed, but I've found in certain challenges the zero needs to be there or the reduce doesn't work properly. I haven't quite wrapped my head around what causes that so I've probably developed a habit of putting it in every time just to be explicit.
paladintakeo Another proposal with a forEach (like for the simple array challenge) :
let result = 0; ar.forEach((value) => result += value) return result;
001SID C:
#include<stdio.h> int main() { int length; scanf("%d",&length); long int num[length],sum = 0; for(int i = 0 ; i< length; i++) { scanf("%ld",&num[i]); sum += num[i]; } printf("%ld",sum); return 0; }
muh_fouadalharo1 Did you meet any difficulties when submitting your code in C ? Because I have a problem in mine when submitting !!
bhuvansingh05 Just remove all the existing code in the window and copy paste what is posted above. The existing main function etc make it unnecessarily tougher imo.
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