View Compilation Error

0_0_34386531_17726.cpp: In function 'void getSG(int)':
0_0_34386531_17726.cpp:53:27: error: 'memset' was not declared in this scope
     memset(SG,0,sizeof(SG));
                           ^
0_0_34386531_17726.cpp: In function 'int cal(int, int)':
0_0_34386531_17726.cpp:72:28: error: 'memset' was not declared in this scope
     memset(SG,-1,sizeof(SG));
                            ^