View Compilation Error

0_0_26134991_2472.cpp: In function 'void insert()':
0_0_26134991_2472.cpp:19:9: error: 'root' was not declared in this scope
         root=trie[rt][id];
         ^
0_0_26134991_2472.cpp: In function 'int search()':
0_0_26134991_2472.cpp:30:9: error: 'root' was not declared in this scope
         root=trie[rt][id];
         ^
0_0_26134991_2472.cpp:32:16: error: 'root' was not declared in this scope
     return sum[root];//因为前缀后移了一个保存，所以此时的sum[root]就是要求的前缀出现的次数 
                ^