using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Diagnostics;
//using System.Numerics;
using Enu = System.Linq.Enumerable;

public class Program
{
    static readonly int INF = int.MaxValue;

    public void Solve()
    {
        int V = Reader.Int(), E = Reader.Int();
        var dist = new int[V, V];

        for (int a = 0; a < V; a++)
            for (int b = 0; b < V; b++)
                dist[a, b] = a == b ? 0 : INF;
        for (int i = 0; i < E; i++)
        {
            int a = Reader.Int(), b = Reader.Int(), c = Reader.Int();
            CheckMin(ref dist[a, b], c);
        }
        for (int c = 0; c < V; c++)
            for (int a = 0; a < V; a++)
                for (int b = 0; b < V; b++)
                    if (dist[a, c] < INF && dist[c, b] < INF)
                        CheckMin(ref dist[a, b], dist[a, c] + dist[c, b]);
        for (int c = 0; c < V; c++)
            for (int a = 0; a < V; a++)
                for (int b = 0; b < V; b++)
                    if (dist[a, c] < INF && dist[c, b] < INF && dist[a, c] + dist[c, b] < dist[a, b])
                    {
                        Console.WriteLine("NEGATIVE CYCLE");
                        return;
                    }
        for (int a = 0; a < V; a++)
        {
            for (int b = 0; b < V; b++)
            {
                Console.Write(dist[a, b] == INF ? "INF" : dist[a, b] + "");
                if (b < V - 1) Console.Write(" ");
            }
            Console.WriteLine();
        }
        Console.ReadLine();
    }

    bool CheckMin(ref int a, int b) { if (b < a) { a = b; return true; } return false; }
}


class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    static TextReader reader = Console.In;
    static readonly char[] separator = { ' ' };
    static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    static string[] A = new string[0];
    static int i;
    static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Range(N, Int); }
    public static int[][] IntTable(int H) { return Range(H, IntLine); }
    public static string[] StringArray(int N) { return Range(N, Next); }
    public static string[][] StringTable(int N) { return Range(N, () => Split(Line())); }
    public static string Line() { return reader.ReadLine().Trim(); }
    static T[] Range<T>(int N, Func<T> f) { return Enu.Range(0, N).Select(i => f()).ToArray(); }
    static string[] Split(string s) { return s.Split(separator, op); }
    static string Next() { CheckNext(); return A[i++]; }
    static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}

Measured memory_bytes: 9624