Compilare: user.cpp: In function ‘int find(int, int, std::vector<edge>&)’: user.cpp:42:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<E.size();i++){ ~^~~~~~~~~ user.cpp: In function ‘void init()’: user.cpp:138:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Ef.size();i++){ ~^~~~~~~~~~ user.cpp: In function ‘void make_top(int, std::deque<int>&)’: user.cpp:150:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<L.size();i++) ~^~~~~~~~~