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Great solution. You could also do away with the 'i' variable and the while loop by replacing them with a for loop.
n = int(input())
arr = list(map(int, input().split()))
largest = max(arr)
for i in range(n):
if largest == max(arr):
arr.remove(max(arr))
print(max(arr))
Your code will show error because when largest number is removed in one iteration, then the next number will be assigned it's index and thus it will become a mess. you could try this
n = int(input())
arr = list(map(int, input().split()))
a = max(arr)
for x in range(len(arr)-1,-1,-1):
if arr[x] == a:
arr.remove(arr[x])
print(max(arr))
n = int(input())
arr = list(map(int, input().split()))
listnew=[]
for i in arr:
if i not in listnew:
listnew.append(i)
listnew.sort(reverse=True)
print(listnew[1])
When I tested a few custom test cases with multiple custom values and they passed. Unless, you think there's a test case I missed? If so, I'm curious which test case would this fail?
n = int(input())
arr = list(map(int, input().split()))
listnew=[]
for i in arr:
if i not in listnew:
listnew.append(i)
listnew.sort(reverse=True)
print(listnew[1])
n = int(input())
arr = list(map(int, input().split()))
listnew=[]
for i in arr:
if i not in listnew:
listnew.append(i)
listnew.sort(reverse=True)
print(listnew[1])**
1st we are getting size of the array from the user (but we re not gonna use it anyway) then we are getting the elements of the array it is to be noted that all the elements are in a single line seperated by "space"
arr=list(map(int, input().split()))
what this code does is that it takes the input and by default ".split()" method split the input with respect to space if you want any other insted like comma "," of spce you can specify it like this " input().split(",") " .since the input function always returns a string to convert the string to int we use map . map is just like a loop it takes value after comma and force it to change it type with what we specify before comma. "map(what to do the value,value)" .finally we are taking all those mappped int value and putting it inside a list.
**
listnew=[]
for i in arr:
if i not in listnew:
listnew.append(i)
listnew.sort(reverse=True)
print(listnew[1]) **
we are creating a new list "listnew" you will know why we have created it later . now we are taking all the values in arr and assaigning it to i from begning using a for loop now if i is not in new list we are appending the value of i to new list we are doing this to eliminate duplicate values
the last two lines are used to reverse the list so that the 1st number will be the winner score and we print " listnew[1] " which is the runner up score
how the maximum value comes first in the new list? I meant how it arranged itself in ascending order before you reversed it use listnew.sort(reverse=True)
n = int(input())
arr = list(map(int, input().split()))
listnew=[]
for i in arr:
if i not in listnew:
listnew.append(i)
listnew.sort(reverse=True)
print(listnew[1])**
1st we are getting size of the array from the user (but we re not gonna use it anyway) then we are getting the elements of the array it is to be noted that all the elements are in a single line seperated by "space"
arr=list(map(int, input().split()))
what this code does is that it takes the input and by default ".split()" method split the input with respect to space if you want any other insted like comma "," of spce you can specify it like this " input().split(",") " .since the input function always returns a string to convert the string to int we use map . map is just like a loop it takes value after comma and force it to change it type with what we specify before comma. "map(what to do the value,value)" .finally we are taking all those mappped int value and putting it inside a list.
**
listnew=[]
for i in arr:
if i not in listnew:
listnew.append(i)
listnew.sort(reverse=True)
print(listnew[1]) **
we are creating a new list "listnew" you will know why we have created it later . now we are taking all the values in arr and assaigning it to i from begning using a for loop now if i is not in new list we are appending the value of i to new list we are doing this to eliminate duplicate values
the last two lines are used to reverse the list so that the 1st number will be the winner score and we print " listnew[1] " which is the runner up score
First you are running for loop on arr, so best case complexity is O(n). Then there are check on entire new list for each iteration, which will make your algo ~ O(n^2)
i had a doubt in map function in the above program.
While iam trying the liist through map function in our IDLE it is giving only one value.I cant rectify the problem. Can you please explain?
n = int(input())
arr = list(map(int, input().split()))
listnew=[]
for i in arr:
if i not in listnew:
listnew.append(i)
listnew.sort(reverse=True)
print(listnew[1])**
1st we are getting size of the array from the user (but we re not gonna use it anyway) then we are getting the elements of the array it is to be noted that all the elements are in a single line seperated by "space"
arr=list(map(int, input().split()))
what this code does is that it takes the input and by default ".split()" method split the input with respect to space if you want any other insted like comma "," of spce you can specify it like this " input().split(",") " .since the input function always returns a string to convert the string to int we use map . map is just like a loop it takes value after comma and force it to change it type with what we specify before comma. "map(what to do the value,value)" .finally we are taking all those mappped int value and putting it inside a list.
**
listnew=[]
for i in arr:
if i not in listnew:
listnew.append(i)
listnew.sort(reverse=True)
print(listnew[1]) **
we are creating a new list "listnew" you will know why we have created it later . now we are taking all the values in arr and assaigning it to i from begning using a for loop now if i is not in new list we are appending the value of i to new list we are doing this to eliminate duplicate values
the last two lines are used to reverse the list so that the 1st number will be the winner score and we print " listnew[1] " which is the runner up score
It seems to me that your code is O(n^2) in the worst case due to the following reasoning:
-Assume we have the worst case like [5,6,6,6,...,6]- an array consisting almost fully out of sixs.
-Then your for-loop will work n-times calling max(arr)-function, which takes O(n).
-So we can say that it's O(n^2) in the worst case, while I can provide the solution with O(n) in this case, even though it's less elegant and requires the creation of some more temporary variables to store the max and second highest value.
-Then can you still claim that your code is the most effective? Please, correct me if I'm wrong, I would really appreciate that.
i am not adding any list just created a list and inserted value inside it to avoid duplicate element you can also use set over there but you cant find max element in it
this code willl get error remove function remove the index values not the max value to remove you want to caluclate the max value index and we want to remove it.
Find the Runner-Up Score!
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you do have a point, max() is O(n), it's not very efficient if there are many duplicated max values
@tao_zhang, here it is for many duplicated max values -
first=arr[0] second=0 for i in range(1,n): if first
max and remove both are O(n)
Use a set to get O(1) complexity.
Great solution. You could also do away with the 'i' variable and the while loop by replacing them with a for loop.
edit: fixed logical error
Your code looks fine but there is a mistake. Try to figure out what it is.
oops, nice catch. I must have copied and pasted the code I was messing with rather than the finished code. It's fixed now.
ok good kuck
Can you share the fixed code?
he figured out that
Your code will show error because when largest number is removed in one iteration, then the next number will be assigned it's index and thus it will become a mess. you could try this
What were the examples that you used that raised an error? I'd like to check it out.
your error wont occurs here
if name == 'main':
hey I am new to python here.can u tell me what is significance of map keyword while taking inputs.
python map() is an iterator.so that we can iterate over elements. can be converted to tuple ,lists
map is also very usefull to use lambda functinons and it applies function to all items in the input list
yes!!one more point!!
Thanks ! Was very helpful
it wont work for multiple max value...
When I tested a few custom test cases with multiple custom values and they passed. Unless, you think there's a test case I missed? If so, I'm curious which test case would this fail?
for every element you are checking the list for its existance which iterates list every time. so it may not so efficient.
yes, thats why you should try this
n=int(input()) l1=list(map((int),input().split())) l2=sorted(list(set(l1))) print(l2[-2])
Hello , can you expain it clearly cause i want to understand how to write in a single line like you.
Amazing!! Simplicity at its best
Wow did not understand this for a hot second. S/o you though, this is good stuff imo even though my opinion as a noob isn't much.
nusta indentation error...
This code will fail if largest number occures multiple time.
You'll get the wrong anwser if we have the list with all same values. Ex: [1, 1]
List with same numbers wont have second largest number.
goog job ! really helpful , Danke schön...
thnaks bro good job
haha if name='main' good luck
very nice code . Thanks
can you pls explain why -1,-1,-1 ??
thats nothing just for counting the nums from reverse...
no need to find largest number n=int(input()) l1=list(map((int),input().split())) l2=sorted(list(set(l1))) print(l2[-2])
could u elaborate the 4th and 5th line?
can you plz, tell me what was the error in your code before fixing it.
Thanks for this! Very clear
use it
if name == 'main':
Simple and super
can u please explain it to me
**
1st we are getting size of the array from the user (but we re not gonna use it anyway) then we are getting the elements of the array it is to be noted that all the elements are in a single line seperated by "space"
arr=list(map(int, input().split()))
what this code does is that it takes the input and by default ".split()" method split the input with respect to space if you want any other insted like comma "," of spce you can specify it like this " input().split(",") " .since the input function always returns a string to convert the string to int we use map . map is just like a loop it takes value after comma and force it to change it type with what we specify before comma. "map(what to do the value,value)" .finally we are taking all those mappped int value and putting it inside a list.
**
listnew.sort(reverse=True)
print(listnew[1]) **
we are creating a new list "listnew" you will know why we have created it later . now we are taking all the values in arr and assaigning it to i from begning using a for loop now if i is not in new list we are appending the value of i to new list we are doing this to eliminate duplicate values the last two lines are used to reverse the list so that the 1st number will be the winner score and we print " listnew[1] " which is the runner up score
Thanks
Great!!
how the maximum value comes first in the new list? I meant how it arranged itself in ascending order before you reversed it use listnew.sort(reverse=True)
great help
this is called perfect lecture with handson.
Why are we using not in?
**
1st we are getting size of the array from the user (but we re not gonna use it anyway) then we are getting the elements of the array it is to be noted that all the elements are in a single line seperated by "space"
arr=list(map(int, input().split()))
what this code does is that it takes the input and by default ".split()" method split the input with respect to space if you want any other insted like comma "," of spce you can specify it like this " input().split(",") " .since the input function always returns a string to convert the string to int we use map . map is just like a loop it takes value after comma and force it to change it type with what we specify before comma. "map(what to do the value,value)" .finally we are taking all those mappped int value and putting it inside a list.
**
listnew.sort(reverse=True)
print(listnew[1]) **
we are creating a new list "listnew" you will know why we have created it later . now we are taking all the values in arr and assaigning it to i from begning using a for loop now if i is not in new list we are appending the value of i to new list we are doing this to eliminate duplicate values the last two lines are used to reverse the list so that the 1st number will be the winner score and we print " listnew[1] " which is the runner up score
First you are running for loop on arr, so best case complexity is O(n). Then there are check on entire new list for each iteration, which will make your algo ~ O(n^2)
But If you have same elemensts in first two indexs this code won't work
he eliminating the duplicacy, so his code works. he wrote very simple and proper code.
i had a doubt in map function in the above program. While iam trying the liist through map function in our IDLE it is giving only one value.I cant rectify the problem. Can you please explain?
can anyone please explain this code
**
1st we are getting size of the array from the user (but we re not gonna use it anyway) then we are getting the elements of the array it is to be noted that all the elements are in a single line seperated by "space"
arr=list(map(int, input().split()))
what this code does is that it takes the input and by default ".split()" method split the input with respect to space if you want any other insted like comma "," of spce you can specify it like this " input().split(",") " .since the input function always returns a string to convert the string to int we use map . map is just like a loop it takes value after comma and force it to change it type with what we specify before comma. "map(what to do the value,value)" .finally we are taking all those mappped int value and putting it inside a list.
**
listnew.sort(reverse=True)
print(listnew[1]) **
we are creating a new list "listnew" you will know why we have created it later . now we are taking all the values in arr and assaigning it to i from begning using a for loop now if i is not in new list we are appending the value of i to new list we are doing this to eliminate duplicate values the last two lines are used to reverse the list so that the 1st number will be the winner score and we print " listnew[1] " which is the runner up score
It seems to me that your code is O(n^2) in the worst case due to the following reasoning: -Assume we have the worst case like [5,6,6,6,...,6]- an array consisting almost fully out of sixs. -Then your for-loop will work n-times calling max(arr)-function, which takes O(n). -So we can say that it's O(n^2) in the worst case, while I can provide the solution with O(n) in this case, even though it's less elegant and requires the creation of some more temporary variables to store the max and second highest value. -Then can you still claim that your code is the most effective? Please, correct me if I'm wrong, I would really appreciate that.
why did you add list here?
i am not adding any list just created a list and inserted value inside it to avoid duplicate element you can also use set over there but you cant find max element in it
If i replace max(arr) to arr(i) inside the for loop , i don't get the expected output.
@DeerFace, good tip! cheers!
n=int(input()) l1=list(map((int),input().split())) l2=sorted(list(set(l1))) print(l2[-2])
@DeerFace I am not getting the second line, can you please explain?
the line 6 is error
Same to my bro
Traceback (most recent call last): File "solution.py", line 7, in res=max(arr) ValueError: max() arg is an empty sequence
I am also getting same error. however its res==max(arr)
this code willl get error remove function remove the index values not the max value to remove you want to caluclate the max value index and we want to remove it.
can u plz keep the snippet of ur code?
can anyone explain this code
use set instead of list
Thank u for your solution...It is very helpful for python beginner like me
n=int(input()) l1=list(map((int),input().split())) l2=sorted(list(set(l1))) print(l2[-2])
can you please explain the while loop here.why are you not using 'i' in if condition.I dint understand how zes==max(arr) is working without using i
Your cont won't work on input of 0 0 0 0 0
You would need to add below condition
in this case it dosent need
hey... i m new to python, we can directly take the input thn why are we applying aplit adn map functions
Hmm i am beginner but i wrote code in 6 lines
Could you not turn the list into a set to deal with multiple values?
Can u pls explain why did u used list here
Yes, alternatively you can use sort function at start and then pop elements until it is not equal to first popped element.
just use set instead of list...it will save only one value for multiple values ..
we can use count() to check number of occurances of max value:
n = int(input())
arr = map(int, input().split())
list1=list(arr)
max1=max(list1)
max_no=list1.count(max1)
[list1.remove(max1) for i in range(0,max_no)]
print(max(list1))