101. Symmetric Tree

The same as the same tree, that is, the same tree compares the same position of two trees, and now it is seen as the flip of this tree and the tree.

1      Public Booleanissymmetric (TreeNode root) {2         returnIssametree (root, root);3     }4     5     Private BooleanIssametree (TreeNode p, TreeNode q) {6         if(p = =NULL&& Q = =NULL) {7             return true;8         }9         if(p = =NULL|| Q = =NULL) {Ten             return false; One         } A         if(P.val! =q.val) { -             return false; -         } the         returnIssametree (P.left, Q.right) &&Issametree (P.right, q.left); -}

101. Symmetric Tree