Compilare: main.cpp: In member function 'void BIT::update(int, int)': main.cpp:62:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] } while (index < this->bit.size()); ~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In member function 'int BIT::find(int) const': main.cpp:78:40: warning: narrowing conversion of '((const BIT*)this)->BIT::bit.std::vector<_Tp, _Alloc>::size<int, std::allocator<int> >()' from 'std::vector<int>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] int i{0}, step{1}, N{this->bit.size()}, S{sum}; ~~~~~~~~~~~~~~^~