View Compilation Error

0_0_29470560_12297.cpp: In function 'void KM_prefect_match()':
0_0_29470560_12297.cpp:31:27: error: 'memset' was not declared in this scope
     memset(ly,0,sizeof(ly));
                           ^
0_0_29470560_12297.cpp: In function 'int main()':
0_0_29470560_12297.cpp:72:38: error: 'memset' was not declared in this scope
         memset(match,-1,sizeof(match));
                                      ^