zoj2972 Hurdles of 110m

当时练习的时候，没有想清楚。  （#－.－）

这题挺水的，把状态转移方程推出来就知道写了。

Code:

#include <stdio.h>
#include <string.h>
#define min(a,b)  a<b  ?  a:b

const int maxn = 115;
const int INF = 1000000000;
int f[maxn][maxn];//f[i][j]表示第i个阶段耗费j点力量时,的最小耗时。

int main()
{
    int i, j, t, n, m, t1, t2, t3, f1, f2;
    scanf("%d", &t);
    while (t--) {
        scanf("%d%d", &n, &m);
        for (i = 0; i <= n; i++)
            for (j = 0; j <= m; j++)
                f[i][j] = INF;
        f[0][m]  = 0;
        for (i = 1; i <= n; i++) {
            scanf("%d%d%d%d%d", &t1, &t2, &t3, &f1, &f2);
            for (j = 0; j <= m; j++) {
                if (j >= f1)
                    f[i][j - f1] = min(f[i][j - f1], f[i - 1][j] + t1);
                f[i][j] = min(f[i][j], f[i - 1][j] + t2);
                if (j + f2 <= m)
                    f[i][j + f2] = min(f[i][j + f2], f[i - 1][j] + t3);
                else
                    f[i][m] = min(f[i][m], f[i - 1][j] + t3);
            }
        }

        int minn = INF;
        for (i = 0; i <= m; i++)
            if (f[n][i] < minn) minn = f[n][i];
        printf("%d
", minn);
    }
    return 0;
}