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Codeforces 455D - Serega and Fun (Solved by Square Root Decomposition) Codeforces 888F - Connecting Vertices Codeforces 932F - Escape Through Leaf
Codeforces 455D - Serega and Fun (Solved by Square Root Decomposition)
Codeforces 888F - Connecting Vertices
Codeforces 932F - Escape Through Leaf