Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:109:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | for (int i = 0; i < adj[nod].size(); ++i) | ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:124:12: warning: unused variable 'j' [-Wunused-variable] 124 | int i, j, a, b; | ^ main.cpp: In function 'int query(int, int, int, int, int)': main.cpp:74:9: warning: 'm' may be used uninitialized [-Wmaybe-uninitialized] 74 | int m; | ^