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这个是随机乱搞,不只是随机

Posted by frkstyc at 2005-08-06 15:43:00 on Problem 2531
In Reply To:不知道随机化是不是这么做,老WA啊!!! Posted by:IamI at 2005-08-06 15:42:00
> #include<iostream.h>
> #include<stdlib.h>
> 
> void main(){
> 	int i,j,n,n2,time,a[20],t[20][20];
> 	long sum,max;
> 
> 	cin>>n;  max=-1; n2=(n+1)/2;
> 	for(i=0;i<n;i++)
> 		for(j=0;j<n;j++)
> 			cin>>t[i][j];
> 
> 	time=200000;
> 
> 	while(time--){
> 		sum=0;
> 
> 		for(i=0;i<n;i++) a[i]=0;
> 
> 		for(i=0;i<n2;i++) a[rand()%n]=1;
> 
> 		for(i=0;i<n;i++)
> 			for(j=0;j<n;j++)
> 			if(  (a[i]) && (!a[j])  ) sum+=t[i][j];
> 
> 		if(sum>max) max=sum;
> 	}
> 
> 	cout<<max<<endl;
> }

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