View Compilation Error

0_0_32701714_17803.cpp: In constructor 'sby::sby()':
0_0_32701714_17803.cpp:13:32: error: 'memset' was not declared in this scope
   memset(next,NULL,sizeof(next));
                                ^
0_0_32701714_17803.cpp: In function 'void insert(char*)':
0_0_32701714_17803.cpp:19:18: error: 'strlen' was not declared in this scope
  int l=strlen(str);
                  ^
0_0_32701714_17803.cpp: In function 'int query(char*)':
0_0_32701714_17803.cpp:67:19: error: 'strlen' was not declared in this scope
  int l=strlen(text);
                   ^