Compilare: main.cpp: In function 'void BFS1(int, int)': main.cpp:14:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A[c].size();i++){ ~^~~~~~~~~~~~ main.cpp: In function 'void BFS2(int, int)': main.cpp:32:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A[c].size();i++){ ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:60:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S.size();i++)cout<<S[i]<<' '; ~^~~~~~~~~