i need a office

二维。 滚动数组。。

93ms 444kb
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <algorithm>

using namespace std;

int main( )
{
    int n, m, i, j;
    double dp[3][10010];
    int mo[1010];
    double p[1010];

    while (scanf("%d%d", &n, &m), n || m )
    {
        for (i = 0; i <= 2; i++)
          for (j = 0; j <= n; j++)
            dp[i][j] = 1;
        memset(p, 0,sizeof(p));
        memset(mo,0,sizeof(mo));

        for (i = 1; i <= m; i++)
            scanf("%d%lf", &mo[i], &p[i]);
        for (i = 1; i <= m; i++)
             for (j = 0; j <= n; j++) {
                if (j >= mo[i])
                    dp[i%3][j] = min(dp[(i-1) % 3][j],dp[(i-1) % 3][ j - mo[i] ] * (1 - p[i]) );
                 else
                    dp[i%3][j] = dp[(i-1) % 3][j];
            }
        printf("%.1lf%%\n",(1 - dp[m % 3][n] )* 100);
    }
        return 0;
}