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大侠们! 指导一下小弟吧!我用的算法依然是排序加回溯,但都超时了N次了。(附上程序)

Posted by team7 at 2005-11-03 21:41:54 on Problem 1011
#include "stdio.h"
#include "stdlib.h“

void bol(int a[],int T)
{
	int i,j,change,t;
	for(i=T-1,change=1;i>=1&&change;i--)
	{
		change=0;
		for(j=0;j<i;j++)
		{
			if(a[j]<a[j+1])
			{
				t=a[j];
				a[j]=a[j+1];
				a[j+1]=t;
				change=1;
			}
		}
	}
}

int T;
int huisu(int k,int b[],int a[]);

int main()
{
	int i,k,b[70];
	int num,a[70],sum,n,n2;
	scanf("%d",&T);
	while(T)
	{
		num=0;
			sum=0;
			n2=0;
		for(i=0;i<T;i++)
		{		
			scanf("%d",&a[i]);
			if(a[i]>50)  {a[i]=0;n2++;}
			sum+=a[i];
		}
		bol(a,T);
		
		if(a[0]==0) {printf("0\n");continue;}
		 k=sum/a[0];
		 printf("%d\n",a[0]);
		for(;k>=1;k--)
		{
			if(sum%k==0)  
			{
				n=sum/k;
				if(a[k]+a[k-1]>n) continue;
				for(i=0;i<k;i++)
				{
					b[i]=n;
					
				}
				num=huisu(k,b,a);
			}
		   if(num==1) break;
		}
				printf("%d\n",sum/k);
		
		scanf("%d",&T);
	}
	return 0;
}

int huisu(int k,int b[],int a[])
{
	int i,j;
	int n,m,num;
	int flag;
	n=0;
	m=0;

	for(i=0;i<k;i++)
	{
	
		if(b[i]!=0)
		{
			for(j=0;j<T;j++)
			{	
				
				flag=0;
				if(a[j]==m) continue;

				if(a[j]!=0&&a[j]<=b[i])
				{
					
					n=b[i];
					flag=1;
					b[i]=b[i]-a[j];
					m=a[j];
					a[j]=0;
					if(i==(k-1)&&b[i]==0)
						return 1;
					else
					num=huisu(k,b,a);
				}
				if(flag==1)
				{
				   if(num==1) return 1;
                   else {b[i]=n;a[j]=m;}
				}
				
			}
			if(b[i]!=0)  return 0;
		}
	}
	return 0;
}

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