View Compilation Error

0_0_33287026_1575.cpp: In function 'void judge(int, int)':
0_0_33287026_1575.cpp:19:27: error: 'memset' was not declared in this scope
     memset(xx,0,sizeof(xx));
                           ^
0_0_33287026_1575.cpp: In function 'int main()':
0_0_33287026_1575.cpp:44:34: error: 'memset' was not declared in this scope
         memset(pd,true,sizeof(pd));
                                  ^