View Compilation Error

0_0_13611819_14640.cpp: In function 'int find(int)':
0_0_13611819_14640.cpp:17:16: error: 'parent' was not declared in this scope
     while(r != parent[r])     //查找跟节点
                ^
0_0_13611819_14640.cpp:22:13: error: 'parent' was not declared in this scope
         j = parent[k];         //用j暂存parent[k]的父节点
             ^