Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:40:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp: In function ‘void DFS2(int)’: user.cpp:89:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[node].size();i++) ^ user.cpp: In function ‘void Solve(int, int)’: user.cpp:151:13: warning: unused variable ‘ans’ [-Wunused-variable] int ans=0; ^