18寒假第四测

problem 4 full 第一题：裸的树状数组 #include <cstdio> const int N = 100010; const int M = N + N; int n, q; int aa[N]; int head[N], dest[M], last[M], etot; int in[N], out[N], seq[N], idc; long long bit[N]; vo

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