View Compilation Error

0_0_13466970_32204.cpp: In function 'void insert(char*, Trie*, int)':
0_0_13466970_32204.cpp:37:24: error: 'strlen' was not declared in this scope
      int len = strlen(a);
                        ^
0_0_13466970_32204.cpp: In function 'void find(char*, Trie*)':
0_0_13466970_32204.cpp:52:44: error: 'memset' was not declared in this scope
      memset(visited, false, sizeof(visited));
                                            ^