View Compilation Error

0_0_20960195_10574.cpp: In function 'int maxMatch()':
0_0_20960195_10574.cpp:35:31: error: 'memset' was not declared in this scope
   memset(visit,0,sizeof(visit));
                               ^
0_0_20960195_10574.cpp: In function 'int main()':
0_0_20960195_10574.cpp:52:27: error: 'memset' was not declared in this scope
   memset(map,0,sizeof(map));
                           ^