Compilare: main.cpp: In member function 'void BIT::init(int, int)': main.cpp:86:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | while (idx < tree.size()) { | ~~~~^~~~~~~~~~~~~ main.cpp: In constructor 'BIT::BIT(std::vector<int>&)': main.cpp:95:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | for(int i=0; i<nums.size(); i++) | ~^~~~~~~~~~~~