View Compilation Error

0_0_16848725_15787.cpp: In function 'void init()':
0_0_16848725_15787.cpp:26:29: error: 'memset' was not declared in this scope
  memset(head,-1,sizeof(head));
                             ^
0_0_16848725_15787.cpp: In function 'int match(int)':
0_0_16848725_15787.cpp:58:29: error: 'memset' was not declared in this scope
  memset(link,-1,sizeof(link));
                             ^