View Compilation Error

0_0_21592153_30821.cpp: In constructor 'node::node()':
0_0_21592153_30821.cpp:13:39: error: 'memset' was not declared in this scope
          memset(next,NULL,sizeof(next));
                                       ^
0_0_21592153_30821.cpp: In function 'int query(node*)':
0_0_21592153_30821.cpp:58:40: error: 'strlen' was not declared in this scope
      int i=0,cnt=0,index,len=strlen(str);
                                        ^