SumMin_XI

#include <fstream>
using namespace std;

int  main()
{
    int n;
    ifstream f("summin_xi.in");
    f>>n;
    int a[n][n];
    for(int i=0;i<n;++i)
        for(int j=0;j<n;++j)
            f>>a[i][j];
    long long int s=0;
    int M[n];
    ofstream g("summin_xi.out");
    for(int j=0;j<n;++j)
    {
        M[j]=2000000000;
        for(int i=0;i<n;++i)
            if(a[i][j]<M[j])
                M[j]=a[i][j];
    }
    for(int i=0;i<n;++i)
        s+=M[i];
    g<<s;
    return 0;
}