Compilare: user.cpp: In function ‘void BFS(long int, long int&)’: user.cpp:41:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<coada.size()) ^ user.cpp:43:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long j=0;j<graf[coada[i]].size();j++) ^ user.cpp: In function ‘void BFS(long int, long int, std::vector<long int>&)’: user.cpp:67:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<coada.size()) ^ user.cpp:69:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (long j=0;j<graf[coada[i]].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:93:16: warning: unused variable ‘dist’ [-Wunused-variable] long c1,c2,dist=0; ^