View Compilation Error

0_0_34240445_8195.cpp: In member function 'void Suffix_Automation::init()':
0_0_34240445_8195.cpp:35:36: error: 'memset' was not declared in this scope
   memset(next[1], 0, sizeof next[1]);
                                    ^
0_0_34240445_8195.cpp: In member function 'int Suffix_Automation::newnode()':
0_0_34240445_8195.cpp:40:40: error: 'memset' was not declared in this scope
   memset(next[cnt], 0, sizeof next[cnt]);
                                        ^
0_0_34240445_8195.cpp: In member function 'void Suffix_Automation::work()':
0_0_34240445_8195.cpp:95:30: error: 'memset' was not declared in this scope
   memset(cntA, 0, sizeof cntA);
                              ^