Compilare: user.cpp: In function ‘void ad(int)’: user.cpp:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<li[P].size();i++) ~^~~~~~~~~~~~~ user.cpp: In function ‘void del(int)’: user.cpp:37:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<li[P].size();i++) ~^~~~~~~~~~~~~ user.cpp: In function ‘void dfs(int, int)’: user.cpp:85:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vv[x].size();i++) ~^~~~~~~~~~~~~ user.cpp: In function ‘void desc(int)’: user.cpp:109:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vv[R].size();i++) ~^~~~~~~~~~~~~ user.cpp:115:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vv[R].size();i++) ~^~~~~~~~~~~~~ user.cpp:121:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<vv[R].size();i++) ~^~~~~~~~~~~~~ user.cpp:135:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<RR[R].size();i++) ~^~~~~~~~~~~~~