View Compilation Error

0_0_13721863_7167.cpp: In constructor 'Trie::Trie()':
0_0_13721863_7167.cpp:11:35: error: 'memset' was not declared in this scope
         memset(next,0,sizeof(next));
                                   ^
0_0_13721863_7167.cpp: In function 'void dfs(Trie*, int, int)':
0_0_13721863_7167.cpp:53:25: error: 'strcpy' was not declared in this scope
             strcpy(ans,s);
                         ^