CE求助

#include<bits/stdc++.h>
#define N 21
using namespace std;

double f[1<<N]={1},a[N][N];
int n,cnt[1<<N];

int main(){
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
		for(int j=1;j<=n;j++)
			scanf("%lf",&a[i][j]),a[i][j]/=100;
	for(int i=1;i<1<<n;i++)
		cnt[i]=cnt[i-(i&(-i))]+1;
	for(int i=1;i<1<<n;i++)
		for(int j=1;j<=n;j++)
			if(i&(1<<(j-1)))
				f[i]=max(f[i],f[i-(1<<(j-1))]*a[cnt[i]][j]);
	printf("%lf",f[(1<<n)-1]*100);
	
}