View Compilation Error

0_0_24422297_14015.cpp: In function 'bool solve(int, int)':
0_0_24422297_14015.cpp:10:27: error: 'memset' was not declared in this scope
  memset(XOR, 0, sizeof XOR);
                           ^
0_0_24422297_14015.cpp:22:23: error: 'max' was not declared in this scope
   maxn = max(maxn, num);
                       ^