Compilare: main.cpp: In function 'int main()': main.cpp:121:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 121 | for (int i = 1; i <= in_out.size(); i++) { | ~~^~~~~~~~~~~~~~~~ main.cpp: In instantiation of 'void BIT<T>::update(int, int) [with T = int]': main.cpp:122:15: required from here main.cpp:13:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for (int i = pos; i < tree.size(); i += (i & (-i))) { | ~~^~~~~~~~~~~~~