Compilare: main.cpp: In function 'void build(const std::vector<int>&)': main.cpp:11:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 11 | for(int i = 1;i < v.size();++i) | ~~^~~~~~~~~~ main.cpp: In function 'std::vector<int> solve(int, ull)': main.cpp:74:33: warning: 'cnt' may be used uninitialized [-Wmaybe-uninitialized] 74 | --cnt; | ^~~~~ main.cpp:27:13: note: 'cnt' was declared here 27 | ull cnt; | ^~~