View Compilation Error

0_0_13512918_20214.cpp: In function 'int find(int, int, int, int, int, bool)':
0_0_13512918_20214.cpp:29:56: error: 'max' was not declared in this scope
    return tmp+max(find(L,-1,l,-1,p,0),find(0,R,0,r,p,0));
                                                        ^