// running main logic of the algorithm
for(int i = 0; i < n; i++) {
    for(int j = 0; j < n; j++) {
        for(int k = 0; k < n; k++) {
            if(d[i][k] == INF or d[k][j] == INF) continue;
            if(d[i][k] + d[k][j] < d[i][j]) {
                d[i][j] = d[i][k] + d[k][j];
            }
        }
    }
}