View Compilation Error

0_0_15260863_5863.cpp: In function 'int MaxMatch()':
0_0_15260863_5863.cpp:36:27: error: 'memset' was not declared in this scope
  memset(cx,0xff,sizeof(cx)); //从0匹配开始增广
                           ^
0_0_15260863_5863.cpp: In function 'int main()':
0_0_15260863_5863.cpp:55:27: error: 'memset' was not declared in this scope
   memset(map,0,sizeof(map));
                           ^