#include <iostream>
#include <fstream>
#include <vector>

using namespace std;

int main() {
    ifstream inp("input.txt");
    int n, m, x, y;
    inp >> n >> m;

    vector<vector<int>> table (n, vector<int>(n, 1001));
    for (int i = 0; i < m; ++i) {
        inp >> x >> y >> table[x - 1][y - 1];
    }
    inp.close();

    for (int k = 0; k < n; ++k) {
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j < n; ++j) {
                if (table[i][k] < 1001 && table[k][j] < 1001) {
                    table[i][j] = min(table[i][j], table[i][k] + table[k][j]);

                }
            }
        }
    }

    ofstream out("output.txt");
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            if (i == j) {
                out << 0;
            }
            else if (table[i][j] != 1001) {
                out << table[i][j];
            }
            else {
                out << " ";
            }

            if (j < n - 1) {
                out << " ";
            }
        }
        out << "\n";
    }
    out.close();
    return 0;
}