acwing 318. 划分大理石

 

 

多重背包及优化

#include <bits/stdc++.h>
using namespace std ;
 const int N=5e5+10;
 int c[N],S,n,f[N];
 
 int solve(){
 	int i,j;
 	S=0;
 	memset(f,0,sizeof f);
 	int flag=0;
 	for(i=1;i<=6;i++){
 		cin>>c[i]; S+=i*c[i]; if(c[i]) flag=1;
 	}
 	if(flag==0) return 0;
 	
 	if(S%2){
 		cout<<"Can't\n";return 1;
 	}
 	f[0]=1;
 	
 	for(i=1;i<=6;i++){
 		int t=c[i];
 		for(int k=1;k<=t;k<<=1){
 			for(j=S;j>=k*i;j--){
 				f[j]|=f[j-k*i];
 			}
 			t-=k;
 		}
 		if(t)
 		 for(j=S;j>=t*i;j--)
 		  f[j]|=f[j-t*i];
 	}
 	
 	 if(f[S/2]) cout<<"Can"; else cout<<"Can't";cout<<endl;
 	 
 	 return 1;
 }

 signed main(){
 	while(solve());
 }