【HDOJ】2571 命运

DP。

 1 /* 2571 */
 2 #include <cstdio>
 3 #include <cstring>
 4 #include <cstdlib>
 5
 6 #define MAXN 25
 7 #define MAXM 1005
 8 #define INF -999999
 9
10 int map[MAXN][MAXM];
11 int dp[MAXN][MAXM];
12
13 int max(int a, int b) {
14     return a>b ? a:b;
15 }
16
17 int main() {
18     int t, n, m;
19     int i, j, k;
20
21     #ifndef ONLINE_JUDGE
22         freopen("data.in", "r", stdin);
23     #endif
24
25     scanf("%d", &t);
26     while (t--) {
27         scanf("%d %d", &n, &m);
28         for (i=1; i<=n; ++i)
29             for (j=1; j<=m; ++j)
30                 scanf("%d", &map[i][j]);
31
32         for (j=0; j<=m; ++j)
33             dp[0][j] = INF;
34         for (i=0; i<=n; ++i)
35             dp[i][0] = INF;
36         dp[0][1] = dp[1][0] = 0;
37         for (i=1; i<=n; ++i) {
38             for (j=1; j<=m; ++j) {
39                 dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
40                 k = 1;
41                 while (j >= k) {
42                     if (j%k == 0)
43                         dp[i][j] = max(dp[i][j], dp[i][j/k]);
44                     ++k;
45                 }
46                 dp[i][j] += map[i][j];
47             }
48         }
49         printf("%d\n", dp[n][m]);
50     }
51
52     return 0;
53 }