Compilare: user.cpp: In function ‘int bfs()’: user.cpp:25:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<v[nod].size(); k++) ^ user.cpp: In function ‘void bf(int)’: user.cpp:49:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0; k<v[nod].size(); k++) ^ user.cpp: In function ‘int main()’: user.cpp:74:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<v[n].size(); k++) ^ user.cpp:92:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<v[i].size(); k++) ^ user.cpp:96:21: warning: unused variable ‘vertex’ [-Wunused-variable] int vertex=v[i][k]; ^ user.cpp:108:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<sol.size(); i++) ^