c语言/c++ 计算品牌价值

请问这题怎么做啊 求代码

#include<bits/stdc++.h>
using namespace std;
int n,sum,minn=1000000;
char a[105][24];
int b[105][24];
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=23;j++){
            cin>>a[i][j];
            b[i][j]=a[i][j]-'0';
            sum+=b[i][j];
            if(b[i][j]<=minn) minn=b[i][j];
        }
    }
    cout<<sum*minn;
    return 0;
}