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483B-Friends and Presents O(1) solution.
By vector96, 10 years ago, In English

Problem: http://mirror.codeforces.com/problemset/problem/483/B

I understood how to solve this problem in binary search but came across this O(1)solution but couldn't understand can someone explain.....

Solution: http://pastebin.com/tGmxbM6N

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Solution link: http://pastebin.com/tGmxbM6N

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