Compilare: main.cpp: In function 'void update(int)': main.cpp:14:29: warning: comparison of integer expressions of different signedness: 'int' and 'ull' {aka 'long long unsigned int'} [-Wsign-compare] 14 | for (int i = pos; i <= n; i += i & (-i)) | ~~^~~~ main.cpp: In function 'int main()': main.cpp:27:27: warning: comparison of integer expressions of different signedness: 'int' and 'ull' {aka 'long long unsigned int'} [-Wsign-compare] 27 | for (int i = 1; i <= n; ++i) { | ~~^~~~