View Compilation Error

0_0_39150931_19554.cpp: In function 'void build(int, int, int)':
0_0_39150931_19554.cpp:16:18: error: 'max' was not declared in this scope
   16 |         tree[id]=max(tree[id*2],tree[id*2+1]);
      |                  ^~~
0_0_39150931_19554.cpp: In function 'void find(int, int, int, int, int)':
0_0_39150931_19554.cpp:21:25: error: 'max' was not declared in this scope
   21 |                 lastmax=max(lastmax,tree[id]);
      |                         ^~~