PYTHON

#include <iostream>
#include <vector>
#include <cmath>
using namespace std;
int main()
{
    long long int n,i,j,m;
    cin >> n >> m;
    vector < vector<long long int>> a(n, vector<long long int>(m,1));
    for(i=0;i<n;++i){
        if (i>0){
            a[i][0]=a[i-1][0]+1;
            a[i][m-1]=a[i-1][m-1]+1;}
        if (i%2==0)
            for (j=0;j<m-1;++j)
                a[i][j+1]=a[i][j]+1;
        else
            for (j=m-1;j>0;j-=1)
                a[i][j-1]=a[i][j]+1;
    }
    for (i=0;i<n;++i){
        for (j=0;j<m;++j)
            cout<<a[i][j]<<" ";
        cout<<endl;
    }

    return 0;
}