Compilare: main.cpp: In function 'void precalc()': main.cpp:77:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | for (int i = 0; i < anc.size(); ++i) { | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:142:9: warning: unused variable 'root' [-Wunused-variable] 142 | int root = 1; | ^~~~