【HDOJ】3496 Watch The Movie

二维费用背包。
 1 #include <stdio.h>
 2 #include <string.h>
 3 
 4 #define mymax(a, b) (a>b) ? a:b
 5 
 6 int dp[105][1005];
 7 int time[105], val[105];
 8 
 9 int main() {
10     int case_n;
11     int n, m, l;
12     int i, j, k;
13 
14     scanf("%d", &case_n);
15 
16     while (case_n--) {
17         scanf("%d%d%d", &n, &m, &l);
18         for (i=1; i<=n; ++i)
19             scanf("%d %d", &time[i], &val[i]);
20         memset(dp, 0xff, sizeof(dp));
21         dp[0][0] = 0;
22         for (i=1; i<=n; ++i) {
23             for (k=m; k>0; --k) {
24                 for (j=l; j>=time[i]; --j) {
25                     if (dp[k-1][j-time[i]] != -1) {
26                         dp[k][j] = mymax(dp[k][j], dp[k-1][j-time[i]]+val[i]); 
27                     }
28                 }
29             }
30         }
31         k = 0;
32         for (i=0; i<=l; ++i) {
33             if (dp[m][i] > k)
34                 k = dp[m][i];
35         }
36         printf("%d
", k);
37     }
38 
39     return 0;
40 }