View Compilation Error

0_0_35265104_4807.cpp: In function 'void push_up(int)':
0_0_35265104_4807.cpp:28:37: error: 'max' was not declared in this scope
  T[i].max = max(T[ls].max, T[rs].max);
                                     ^
0_0_35265104_4807.cpp:29:37: error: 'min' was not declared in this scope
  T[i].min = min(T[ls].min, T[rs].min);
                                     ^