static int[][] array;

public static void main(String[] args)throws IOException {

BufferedReader buffer = new BufferedReader(new InputStreamReader(System.in));

int city = Integer.parseInt(buffer.readLine());

int n = Integer.parseInt(buffer.readLine());

array = new int[city+1][city+1];

for(int i = 1; i<= city; i++) {

for (int j = 1; j <= city; j++) {

if(i == j) array[i][j] = 0;

else array[i][j] = 9999999;

}

}

for(int i = 1; i <= n; i++){

String input [] = buffer.readLine().split(" ");

int start = Integer.parseInt(input[0]);

int end = Integer.parseInt(input[1]);

int weight = Integer.parseInt(input[2]);

array[start][end] = Math.min(array[start][end], weight);

}

for(int k = 1; k<= city; k++){

for(int s = 1; s<= city; s++){

for(int e = 1; e<= city; e++){

array[s][e] = Math.min(array[s][e], array[s][k]+array[k][e]);

}

}

}

for(int i = 1; i<= city; i++) {

for (int j = 1; j <= city; j++) {

if (array[i][j] == 9999999) System.out.print("0" + " ");

else System.out.print(array[i][j]+ " ");

}

System.out.println();

}

}