foo.cpp: In function 'void floyd()':
foo.cpp:33:33: error: 's' was not declared in this scope
    for (int j = 0; j < n; j++) {s
                                 ^
foo.cpp:34:5: error: expected ';' before 'dist'
     dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j]);
     ^