View Compilation Error

0_0_20923095_20265.cpp: In function 'void Moblus()':
0_0_20923095_20265.cpp:24:36: error: 'memset' was not declared in this scope
  memset(check, false, sizeof(check));
                                    ^
0_0_20923095_20265.cpp: In function 'int main()':
0_0_20923095_20265.cpp:95:29: error: 'memset' was not declared in this scope
   memset(cnt, 0, sizeof(cnt));
                             ^