【題解】[牛客網NOIP賽前集訓營-提高組（第六場）]B.選擇題 期望DP

#include<cstdio> #include<algorithm> using namespace std; const int N=2e3+10; const int mod=998244353; int n,p[N][4],w[4][4],pre[N][N],suf[N][N],ans[N]; int main() { //freopen("in.txt","r",stdin); s

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