#include <iostream>
#include <fstream>
using namespace std;
ifstream f("roy-floyd.in");
ofstream g("roy-floyd.out");
int i,j,k,n,c,m,a[1000][1000];
void rf(int i,int j, int k)
{
        for (k=1;k<=n;k++)
            for (i=1;i<=n;i++)
                for (j=1;j<=n;j++)
            if(a[i][k]!=0 && a[k][j]!=0 && i != j && (a[i][j] > a[i][k] + a[k][j] || a[i][j]==0))
                a[i][j] = a[i][k] + a[k][j];
}
  int main()
{
        f>>n>>m;
        while (f>>i>>j>>k)
            {
                a[i][j]=k;
                rf(i,j,k);
            }
        for (int i=1;i<=n;i++)
            {
                for (int j=1;j<=n;j++)
                {
                if (i==j)
                    g<<"0"<<" ";
            else
                if(a[i][j]==0)
                g<<"-1"<<" ";
                    else
                    g<<a[i][j]<<" ";
                }
                    g<<endl;
            }

}