标签:des style blog class code tar
Time Limit: 1000MS | Memory Limit: 10000K | |
Total Submissions: 57229 | Accepted: 14680 |
Description
Input
Output
Sample Input
1 0 1 2 0 0 1 0 0 0 1 1 0 0 0 0 0 0
Sample Output
Collection #1: Can‘t be divided. Collection #2: Can be divided.
用多重背包可以做,貌似搜索也行,但要从大往小的地方搜。
#include"stdio.h" #include"string.h" #define N 120005 int num[10],w[10]; int v; int f[N]; int max(int a,int b) { return a>b?a:b; } void zero(int c,int w) { int i; for(i=v;i>=c;i--) f[i]=max(f[i],f[i-c]+w); } void comple(int c,int w) { int i; for(i=c;i<=v;i++) f[i]=max(f[i],f[i-c]+w); } void multi(int c,int w,int num) { if(c*num>=v) comple(c,w); else { int k=1; while(k<num) { zero(k*c,k*w); num-=k; k*=2; } zero(num*c,num*w); } } int main() { int i,Case=1; while(scanf("%d",&num[1])) { v=num[1]; for(i=2;i<=6;i++) { scanf("%d",&num[i]); v+=num[i]*i; } if(v==0) break; printf("Collection #%d:\n",Case++); if(v%2==1) { printf("Can‘t be divided.\n\n"); continue; } v/=2; memset(f,0,sizeof(f)); for(i=1;i<7;i++) { if(num[i]==0) continue; multi(i,i,num[i]); } int flag=0; if(f[v]==v) printf("Can be divided.\n\n"); else printf("Can‘t be divided.\n\n"); } return 0; }
dfs代码:
#include"stdio.h" #include"string.h" #define N 7 int num[N],v,flag; void dfs(int i,int sum) { if(flag) return ; if(sum==v) { flag=1; return ; } for(;i>0;i--) { if(num[i]) //开始用while竟然出不来了!! { if(sum+i<=v) { num[i]--; //先改变值,再进行下一层搜索 dfs(i,sum+i); if(flag) //剪枝 return ; } } } return ; } int main() { int i,Case=1; while(scanf("%d",&num[1])) { v=num[1]; for(i=2;i<N;i++) { scanf("%d",&num[i]); v+=num[i]*i; } if(v==0) break; printf("Collection #%d:\n",Case++); flag=0; if(v%2==0) { v/=2; dfs(6,0); } if(flag) printf("Can be divided.\n\n"); else printf("Can‘t be divided.\n\n"); } return 0; }
poj 1014 Dividing,布布扣,bubuko.com
标签:des style blog class code tar
原文地址:http://blog.csdn.net/u011721440/article/details/24926625