hdu 5570 balls（高效）

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题目链接：hdu 5570 balls

代码

#include <cstdio>
#include <cstring>
#include <algorithm>using namespace std;
const int maxn = 1005;int N, M;
double A[maxn][maxn];int main () {while (scanf("%d%d", &N, &M) == 2) {for (int i = 1; i <= N; i++) {double sm = 0;for (int j = 1; j <= M; j++) {scanf("%lf", &A[i][j]);sm += A[i][j];}for (int j = 1; j <= M; j++) A[i][j] /= sm;}double ans = 0;for (int j = 1; j <= M; j++) {double mv = 0;for (int i = 1; i <= N; i++) {ans += A[i][j] * mv * 2 + A[i][j];mv += A[i][j];}}printf("%.2lf\n", ans);}return 0;
}

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