Compilare: main.cpp: In function 'void dfs(ll)': main.cpp:39:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for(i = 0; i < v[u].size(); i++) | ~~^~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:58:17: warning: unused variable 'j' [-Wunused-variable] 58 | ll n, i, m, j, a, b; | ^