bzoj1222: [HNOI2001]产品加工

注意时间都是 <= 5的。。

 1 #include<cstdio>
 2 #include<cstring>
 3 #include<cstdlib>
 4 #include<algorithm>
 5 #include<iostream>
 6
 7 using namespace std;
 8
 9 template<typename Q> Q read(Q& x) {
10     static char c, f;
11     for(f = 0; c = getchar(), !isdigit(c); ) if(c == ‘-‘) f = 1;
12     for(x = 0; isdigit(c); c = getchar()) x = x * 10 + c - ‘0‘;
13     if(f) x = -x;
14     return x;
15 }
16 template<typename Q> Q read() {
17     static Q x; read(x); return x;
18 }
19
20 const int N = 6000 + 10, INF = 6000 * 5 + 10;
21 int a[N], b[N], c[N];
22 int f[N * 5];
23
24 int main() {
25 #ifdef DEBUG
26     freopen("in.txt", "r", stdin);
27     freopen("out.txt", "w", stdout);
28 #endif
29
30     int n, maxw = 0;
31     scanf("%d", &n);
32     for(int i = 1; i <= n; i++) {
33         scanf("%d%d%d", a + i, b + i, c + i);
34         if(!a[i]) a[i] = INF;
35         if(!b[i]) b[i] = INF;
36         if(!c[i]) c[i] = INF;
37         maxw += min(min(a[i], b[i]), c[i]);
38     }
39     memset(f, 0x3f, sizeof f);
40     f[0] = 0;
41     for(int i = 1; i <= n; i++) {
42         for(int j = maxw; j >= 0; j--) {
43             f[j] += b[i];
44             if(j >= a[i]) f[j] = min(f[j], f[j - a[i]]);
45             if(j >= c[i]) f[j] = min(f[j], f[j - c[i]] + c[i]);
46         }
47     }
48     int ans = INF;
49     for(int i = 0; i <= maxw; i++) ans = min(ans, max(i, f[i]));
50     printf("%d\n", ans);
51
52     return 0;
53 }