tri par variance

import java.util.*;
import java.io.*;
import java.math.*;

class Solution {

    public static void main(String args[])
    {
        Scanner in = new Scanner(System.in);
        Map<Integer, Double> map = new HashMap<>();
        int N = in.nextInt();
        int M = in.nextInt();
        for (int i = 0; i < N; i++) {
            int[] tab = new int[M];
            for (int j = 0; j < M; j++) {
                tab[j] = in.nextInt();

            }
            map.put(i+1,variance(tab));
        }
        double min = -1;
        int indiceMin = 1;
        for(int x : map.keySet())
        {
            double y = map.get(x);
            if(min == -1)
                min = y;
            else
            {
                if(y < min)
                {
                    min = y;
                    indiceMin = x;
                }
            }
        }
        System.out.println(indiceMin);
    }
    public static double variance(int[] tab)
    {
        double moy = 0.0;
        for(int x : tab)
            moy += x;
        moy /= tab.length;
        double variance = 0.0;
        for(int x : tab)
        {
            double y = Math.pow(x-moy,2);
            variance += y;
        }
        return variance;
    }
}