Compilare: main.cpp: In function 'void dfs(int)': main.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<graf[x].size();i++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:144:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<ceau.size();j++) ~^~~~~~~~~~~~