Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:80:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vec[x].size(); ++i){ ^ user.cpp: In function ‘int update(int, int)’: user.cpp:90:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vec[x].size(); ++i){ ^ user.cpp:94:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void apm(int)’: user.cpp:108:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Edges[c].size(); ++i){ ^