Compilare: main.cpp: In function 'int BFS(int, int, int)': main.cpp:29:12: warning: unused variable 'j' [-Wunused-variable] int i, j; ^ main.cpp: In function 'int main()': main.cpp:114:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=1;k<sd.size();k++) ~^~~~~~~~~~ main.cpp:134:33: warning: 'finalj' may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<finali<<" "<<finalj<<" "<<smax<<"\n"; ^~~ main.cpp:134:20: warning: 'finali' may be used uninitialized in this function [-Wmaybe-uninitialized] fout<<finali<<" "<<finalj<<" "<<smax<<"\n"; ^~~