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#include <iostream>
#include <cstring>
#include <fstream>
#include <vector>
using namespace std;

int graph[555][555];
int shortest_path[555][555];
const int INF = 1e9;
int main()
{
    int n, m;
    cin >> n >> m;
    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= n; j++) {
            if(i == j) {
                graph[i][j] = 0;
            }
            else {
                graph[i][j] = 1e9;
            }
        }
    }
    for(int i = 0; i < m; i++) {
        int a, b, c;
        cin >> a >> b >> c;
        graph[a][b] = c;
    }
    
    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= n; j++) {
            shortest_path[i][j] = graph[i][j];
        }
    }
    cout << endl;
    
    for(int k = 1; k <= n; k++) {
        for(int i = 1; i <= n; i++) {
            for(int j = 1; j <= n; j++) {
                if(shortest_path[i][k] != INF and shortest_path[k][j] != INF) {
                    shortest_path[i][j] = min(shortest_path[i][j], shortest_path[i][k] + shortest_path[k][j]);
                }
            }
        }
    }
    
    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= n; j++) {
            cout << shortest_path[i][j] << " ";
        }
        cout << endl;
    }
    return 0;
}