Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:46:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < v[ k ].size(); ++i ){ ^ user.cpp: In function ‘int main()’: user.cpp:55:18: warning: unused variable ‘s’ [-Wunused-variable] int m, i, j, s, t, d, x, y, c, st, dr; ^ user.cpp:55:21: warning: unused variable ‘t’ [-Wunused-variable] int m, i, j, s, t, d, x, y, c, st, dr; ^ user.cpp:55:24: warning: unused variable ‘d’ [-Wunused-variable] int m, i, j, s, t, d, x, y, c, st, dr; ^ user.cpp:85:14: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << i; ^