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Given an integer num, find the closest two integers in absolute difference whose product equals num + 1 or num + 2. Return the two integers in any ord ......

给出一棵树的 dfs 序，求可能的构成方案数。 A______A_______ f[l ][ r] =sum{ f[l+1][k-1] *f[k][j] } #include <iostream> #include <cstring> #include <sstream> using namespa ......