Compilare: main.cpp: In function 'int main()': main.cpp:146:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 146 | for (j = 0; j + 1 < ord[i].size(); j++) | ~~~~~~^~~~~~~~~~~~~~~ main.cpp:155:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<ob>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 155 | for (j = 0; j < ancestors.size(); j++) | ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int lca(int, int)': main.cpp:54:9: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized] 54 | int ans, i; | ^~~