Compilare: user.cpp: In function ‘int compare(muchie, muchie)’: user.cpp:44:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a.e > 0 && b.e > 0) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:57:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:81:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ninjago.out","w",stdout); ^