Compilare: main.cpp: In function 'void dfs(int)': main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();++i) ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Gt[nod].size();++i) ~^~~~~~~~~~~~~~~ main.cpp: At global scope: main.cpp:45:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In function 'int main()': main.cpp:76:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<ctc[i].size();++j) ~^~~~~~~~~~~~~~