View Compilation Error

0_0_29946056_27152.cpp: In member function 'void SAM::init()':
0_0_29946056_27152.cpp:12:34: error: 'memset' was not declared in this scope
   memset(nxt[1], 0, sizeof nxt[1]);
                                  ^
0_0_29946056_27152.cpp: In member function 'int SAM::newnode()':
0_0_29946056_27152.cpp:19:38: error: 'memset' was not declared in this scope
   memset(nxt[cnt], 0, sizeof nxt[cnt]);
                                      ^
0_0_29946056_27152.cpp: In function 'int main()':
0_0_29946056_27152.cpp:69:17: error: 'strlen' was not declared in this scope
   len = strlen(s);  sam.init();
                 ^