Compilare: main.cpp: In function 'void bfs(int, int)': main.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[p].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:81:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<conc.size() and extra[j])j++; ~^~~~~~~~~~~~ main.cpp:83:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==conc.size()){ ~^~~~~~~~~~~~~