Compilare: user.cpp: In member function ‘int FenwickTree::query(int) const’: user.cpp:21:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( ; pos <= m_size; pos += lsb(pos)) { ^ user.cpp: In member function ‘FenwickTree FenwickTree::Combine(const FenwickTree&) const’: user.cpp:29:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= m_size; i++) { ^ user.cpp: In function ‘std::vector<int> Solve(std::tuple<std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::vector<std::tuple<int, int, int, int>, std::allocator<std::tuple<int, int, int, int> > > >)’: user.cpp:73:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < n; i++) { ^ user.cpp:74:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0 ; j < m; j++) { ^ user.cpp:78:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < queries.size(); i += 1) { ^ user.cpp:82:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < matrix.size(); i += 1) { ^ user.cpp:98:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int diagonal = 2; diagonal <= n; diagonal += 1) { ^ user.cpp:101:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i + diagonal -1 < n; i += 1) { ^ user.cpp:106:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int col = 0; col < m; col += 1) { ^