Compilare: user.cpp: In member function ‘std::pair<int, int> node::find(int, int)’: user.cpp:27:22: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] return sub[n & 1 ^ 1]->find( n >> 1, l - 1 ); ^ user.cpp: In function ‘int main()’: user.cpp:112:48: warning: ‘m_dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << m_val << ' ' << m_st << ' ' << m_dr; ^ user.cpp:112:29: warning: ‘m_st’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << m_val << ' ' << m_st << ' ' << m_dr; ^