Compilare: main.cpp: In function 'void BFS(int, int, int&)': main.cpp:26:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[a].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sir.size();i++) ~^~~~~~~~~~~ main.cpp:58:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[inund].size();j++) ~^~~~~~~~~~~~~~~~ main.cpp:71:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();i++) fout<<sol[i]<<'\n'; ~^~~~~~~~~~~