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:31:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<A[c].size();i++){ ~^~~~~~~~~~~~ main.cpp:30:19: warning: variable 'ind' set but not used [-Wunused-but-set-variable] int c=q.front(),ind,nc=0; ^~~ main.cpp:30:23: warning: unused variable 'nc' [-Wunused-variable] int c=q.front(),ind,nc=0; ^~ main.cpp: In function 'int main()': main.cpp:62:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++)cout<<s[i]<<' '; ~^~~~~~~~~