Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:27:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[x].size();i++){ ^ user.cpp: In function ‘void dfsa(int, int)’: user.cpp:39:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<tr[x].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:58:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<tr[p].size();i++) gr[p]=max(gr[p],gr[tr[p][i]]); ^ user.cpp:68:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<tr[p].size();i++){ ^