Compilare: main.cpp: In function 'void dfs2(int, int, int)': main.cpp:19:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for (int j = 0; j < children[i].size(); ++j) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs1(int, int)': main.cpp:30:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for (int j = 0; j < children[i].size(); ++j) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:15: warning: unused variable 'j' [-Wunused-variable] 47 | int n, i, j; | ^