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大牛好,大牛您的剪枝不够强!

Posted by Sempr at 2007-01-20 22:09:36 on Problem 1011
In Reply To:help!!why tle?? Posted by:shenfangyi at 2007-01-20 20:07:08
> #include<stdio.h>
> #include<string.h>
> #include<algorithm>
> using namespace std;
> int a[70],s[70],m,t,n;
> bool dfs(int x,int y,int max)
> {
> 	if(x<0)return true;
> 	int i=0;
> 	if(x<n-1&&s[x]==s[x+1])i=y-1;
> 	for(;i<=max&&i<t/m;i++)if(a[i]+s[x]<=m)
> 	{
> 		a[i]+=s[x];
> 		if(dfs(x-1,i+1,(i+1>max)?i+1:max))return true;
> 		a[i]-=s[x];
> 	}
> 	return false;
> }
> int main()
> {
> 	scanf("%d",&n);
> 	while(n)
> 	{
> 		t=0;
> 		for(int i=0;i<n;i++)scanf("%d",s+i),t+=s[i];
> 		sort(s,s+n);
> 		for(m=s[n-1];m<t;m++)if(t%m==0)
> 		{
> 			memset(a,0,sizeof(a));
> 			if(dfs(n-1,0,0))break;
> 		}
> 		printf("%d\n",m);
> 		scanf("%d",&n);
> 	}
> }

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