Compilare: main.cpp: In function 'void dfs(int, int, std::pair<int, int>&)': main.cpp:34:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for (int i = 0; i < children.size(); ++i) { | ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int get_first_leaf()': main.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type] 25 | } | ^