Compilare: main.cpp: In function 'll dfs(ll, ll)': main.cpp:31:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for(int i = 0; i<a[x].size(); i++){ | ~^~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:60:5: warning: unused variable 'r' [-Wunused-variable] 60 | ll r = dfs(0, -1); | ^