Compilare: user.cpp: In function ‘void sol(int, int)’: user.cpp:37:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void DFS2(int, int)’: user.cpp:78:37: 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()’: user.cpp:108:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Sol.size(); i++) ^