Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:117:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 117 | for (int i = 0; i < adj[nod].size(); ++i) | ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:138:12: warning: unused variable 'j' [-Wunused-variable] 138 | int i, j, a, b; | ^ main.cpp: In function 'long long int query(int, int, int, int, int)': main.cpp:75:15: warning: 'm' may be used uninitialized [-Wmaybe-uninitialized] 75 | long long m; | ^