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不知道随机化是不是这么做,老WA啊!!!#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; } Followed by:
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