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question link : https://codeforces.me/problemset/problem/459/D solution link: https://codeforces.me/contest/459/submission/103579274
here if i am using arr[i]=upper_bound(arr1.begin(),arr1.begin()+n1,arr[i])-arr1.begin(); than it is showing wrong answer . why?
pls help.
lower_bound finds the first element (or position of element) that is not less than X
upper_bound finds the first element (or position of element) that is strictly more than X