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dsu on tree (http://codeforces.com/contest/208/problem/E) int divide by int without HLD range Quey can be handled by just using segment tree on the FLATTENED TREE (euler tour) can be zero perimetar na triagolnik On Off KMP substring search Havel Hakimi UVA-12786 Friendship Networks Generating π from 1,000 random numbers MyStringv2