Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:42:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<LA[u].size(); ++i) { ^ user.cpp: In function ‘void solve()’: user.cpp:74:9: warning: unused variable ‘x’ [-Wunused-variable] int t, x, tests; ^ user.cpp:75:15: warning: variable ‘y’ set but not used [-Wunused-but-set-variable] int u, v, c, y, z; ^ user.cpp:75:18: warning: variable ‘z’ set but not used [-Wunused-but-set-variable] int u, v, c, y, z; ^