Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void ins(int, int, int)’: user.cpp:32:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ind=0;ind<h[x].size();ind++) ^ user.cpp: In function ‘void del(int, int)’: user.cpp:44:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ind=0;ind<h[x].size();ind++) ^ user.cpp: In function ‘bool finds()’: user.cpp:60:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ind=0;ind<h[nr].size();ind++) ^