Please See this Question of codeforces?

#1

Question:
https://codeforces.com/problemset/problem/459/B

My approach:

#2

@dhruvilcodes there are 2 errors in your code
1, over flow in line no 17 use (long long) in front of count as its return type is int
2. write (n*(n+1))/2 carefully you are writing it as (n+1)*n/2 which is different if divides by 2 before multiplying n and n+1


this is the changed code
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#3

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