Compilare: main.cpp: In function 'void Dfs()': main.cpp:24:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = I[x]; i < G[x].size(); ++i) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < R.size(); ++i) ~~^~~~~~~~~~