View Compilation Error

0_0_20654452_17465.cpp: In function 'void insert(int)':
0_0_20654452_17465.cpp:20:13: error: 'root' was not declared in this scope
  node *cur=&root;
             ^
0_0_20654452_17465.cpp: In function 'll search(int)':
0_0_20654452_17465.cpp:38:13: error: 'root' was not declared in this scope
  node *cur=&root;
             ^