Compilare: main.cpp: In function 'void bt(int, int)': main.cpp:28:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<C.size();j++) ~^~~~~~~~~ main.cpp: In function 'void DFS(int)': main.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[k].size();i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:78:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<prim.size();j++){ ~^~~~~~~~~~~~