View Compilation Error

0_0_21435561_25361.cpp: In function 'int main()':
0_0_21435561_25361.cpp:36:9: error: 'i' was not declared in this scope
    tree[i].clear();
         ^
0_0_21435561_25361.cpp:47:3: error: expected ';' before 'for'
   for(int i=1;i<n;i++)
   ^
0_0_21435561_25361.cpp:47:22: error: expected ';' before ')' token
   for(int i=1;i<n;i++)
                      ^