Compilare: main.cpp: In function 'void dfs(int)': main.cpp:15:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<G[u].size();++j) ~^~~~~~~~~~~~ main.cpp: In function 'void dfs_tr(int)': main.cpp:28:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<Gtr[u].size();++j) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:62:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<rez.size();++i) ~^~~~~~~~~~~ main.cpp:64:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<rez[i].size();++j) ~^~~~~~~~~~~~~~