View Compilation Error

1_734_4495_13613.cpp: In function 'bool SearchP()':
1_734_4495_13613.cpp:19:26: error: 'memset' was not declared in this scope
  memset(dx, -1, sizeof dx);
                          ^
1_734_4495_13613.cpp: In function 'int MaxMatch()':
1_734_4495_13613.cpp:75:26: error: 'memset' was not declared in this scope
  memset(Mx, -1, sizeof Mx);
                          ^