View Compilation Error

0_0_21678785_18025.cpp: In function 'int getSum()':
0_0_21678785_18025.cpp:59:32: error: 'memset' was not declared in this scope
  memset (link, 0, sizeof (link)) ;
                                ^
0_0_21678785_18025.cpp: In function 'int main()':
0_0_21678785_18025.cpp:76:35: error: 'memset' was not declared in this scope
   memset (map, false, sizeof (map)) ;
                                   ^