hdu1059 Dividing ——多重背包

link:http://acm.hdu.edu.cn/showproblem.php?pid=1059

最简单的那种

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cstdlib>
 4 #include <cstring>
 5 #include <cmath>
 6 #include <cctype>
 7 #include <algorithm>
 8 #include <queue>
 9 #include <deque>
10 #include <queue>
11 #include <list>
12 #include <map>
13 #include <set>
14 #include <vector>
15 #include <utility>
16 #include <functional>
17 #include <fstream>
18 #include <iomanip>
19 #include <sstream>
20 #include <numeric>
21 #include <cassert>
22 #include <ctime>
23 #include <iterator>
24 const int INF = 0x3f3f3f3f;
25 const int dir[8][2] = {{-1,0},{1,0},{0,-1},{0,1},{-1,-1},{-1,1},{1,-1},{1,1}};
26 using namespace std;
27 int V,m[6],c[6],w[6],f[66666];
28 void zeropack(int c, int w)
29 {
30     for (int v=V;v>=c;--v) f[v]=max(f[v],f[v-c]+w);
31     return;
32 }
33 void completepack(int c,int w)
34 {
35     for(int v=c;v<=V;++v) f[v]=max(f[v],f[v-c]+w);
36     return;
37 }
38 void multipack(int c,int w,int m)
39 {
40     if(c*m>=V)
41     {
42         completepack(c,w); return;
43     }
44     int k=1;
45     while (k<m)
46     {
47         zeropack(k*c,k*w); m-=k; k*=2;
48     }
49     zeropack(c*m,w*m);
50     return;
51 }
52 int main(void)
53 {
54     ios::sync_with_stdio(false);
55     #ifndef ONLINE_JUDGE
56     freopen("in.txt", "r", stdin);
57     #endif // ONLINE_JUDGE
58     int t=1; for(int i=0;i<6;++i) c[i]=w[i]=i+1;
59     while (1)
60     {
61         int sum=0;
62         for(int i=0;i<6;++i) cin>>m[i], sum+=m[i]*(i+1);
63         if(!sum) break;
64 //        if(t!=1) cout<<endl;
65         cout<< "Collection #"<<t<<":\n";
66         t++;
67         if(sum&1) {cout<< "Can't be divided."<<endl<<endl; continue;}
68         V=sum/2;
69         memset(f,-INF,sizeof(f)); f[0]=0;
70         for(int i=0;i<6;++i) multipack(c[i],w[i],m[i]);
71         if(f[V]<0) cout<< "Can't be divided."<<endl;
72         else cout<< "Can be divided."<<endl;
73         cout<<endl;
74     }
75     return 0;
76 }

其实还是要理解一下这个思想……
不能单靠记忆

posted on 2013-08-15 17:51  aries__liu  阅读(162)  评论(0编辑  收藏  举报