[HAOI2009]逆序對數列

腦殘題，過c++ #include<bits/stdc++.h> #define MAXN 2005 typedef long long ll; using namespace std; int n,k,f[MAXN][MAXN],g[MAXN]; int main(){ memset(f , 0 , sizeof(f)); cin>>n>>k; f[0][0] = 1; g[0] =

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