Compilare: main.cpp: In function 'void recursiveDfs(int&, int&, std::vector<int>&, std::vector<int>&, int*, std::vector<std::vector<int> >&, int&)': main.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[node].size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'std::vector<int> lca(std::vector<std::vector<int> >&, std::vector<std::pair<int, int> >&)': main.cpp:122:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < queries.size(); ++i) { ~~^~~~~~~~~~~~~~~~ main.cpp:106:29: warning: unused variable 'rmq' [-Wunused-variable] int node = 1, level = 0, **rmq, *lg; ^~~ main.cpp:106:35: warning: unused variable 'lg' [-Wunused-variable] int node = 1, level = 0, **rmq, *lg; ^~ main.cpp: In function 'int main()': main.cpp:192:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++i) { ~~^~~~~~~~~~~~