View Compilation Error

0_0_17107099_16079.cpp: In function 'void KM_prefect_match()':
0_0_17107099_16079.cpp:31:28: error: 'memset' was not declared in this scope
      memset(ly,0,sizeof(ly));
                            ^
0_0_17107099_16079.cpp: In function 'int main()':
0_0_17107099_16079.cpp:72:39: error: 'memset' was not declared in this scope
          memset(match,-1,sizeof(match));
                                       ^