Compilare: main.cpp: In function 'int dfs(int, int, std::vector<int>*)': main.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<x[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp:24:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:54:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<ans[i].size(); j++) ~^~~~~~~~~~~~~~