GYM - 5

#include <iostream>
#include <vector>
#include <cmath>
using namespace std;
ostream & operator<<(ostream & out, vector<long long int> const & v)
{
    for (int el:v)
        out<<el<<" ";
    return out;
}

int main()
{
    long long int n,i,j,m,ma,c;
    cin >> n >> m;
    vector < vector<long long int>> a(n, vector<long long int>(m));
    vector<long long int> k;
    ma=0;
    c=0;
    for (i=0;i<n;++i)
        for(j=0;j<m;++j){
            cin >> a[i][j];
            if (a[i][j]>ma)
                ma=a[i][j];
        }
    for (i=0;i<n;++i){
        for (j=0;j<m;++j)
        {
            if (a[i][j]==ma)
            {
                ++c;
                k.push_back(i);
                break;
            }
        }
    }
    cout<<c<<endl;
    cout<<k;
    return 0;
}