Compilare: user.cpp: In function ‘void bfs()’: user.cpp:18:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < vf_transpus[x].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:52:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < vec.size(); i++){ ^ user.cpp:32:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y; ^