[luoguP1507] NASA的食物计划（DP）

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二位费用背包

 

——代码

 1 #include <cstdio>
 2 #include <iostream>
 3 
 4 int n, maxv, maxw;
 5 int f[410][410];
 6 
 7 inline int read()
 8 {
 9     int x = 0, f = 1;
10     char ch = getchar();
11     for(; !isdigit(ch); ch = getchar()) if(ch == '-') f = -1;
12     for(; isdigit(ch); ch = getchar()) x = (x << 1) + (x << 3) + ch - '0';
13     return x * f;
14 }
15 
16 inline int max(int x, int y)
17 {
18     return x > y ? x : y;
19 }
20 
21 int main()
22 {
23     int i, j, k, v, w, val;
24     maxv = read();
25     maxw = read();
26     n = read();
27     for(i = 1; i <= n; i++)
28     {
29         v = read();
30         w = read();
31         val = read();
32         for(j = maxv; j >= v; j--)
33             for(k = maxw; k >= w; k--)
34                 f[j][k] = max(f[j][k], f[j - v][k - w] + val);
35     }
36     printf("%d\n", f[maxv][maxw]);
37     return 0;
38 }
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posted @ 2017-05-26 19:15  zht467  阅读(119)  评论(0)    收藏  举报