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-rw-r--r--other/symmetric_tree.cpp33
1 files changed, 33 insertions, 0 deletions
diff --git a/other/symmetric_tree.cpp b/other/symmetric_tree.cpp
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--- /dev/null
+++ b/other/symmetric_tree.cpp
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+// 101. Symmetric Tree
+#include "leetcode.h"
+
+// given 'root' of binary tree, check whether it is a mirror of itself
+
+class Solution {
+public:
+ bool isSymmetric(TreeNode *root) {
+ TreeNode *left, *right;
+ if (!root)
+ return true;
+ queue<TreeNode *> q1, q2;
+ q1.push(root->left);
+ q2.push(root->right);
+ while (!q1.empty() && !q2.empty()) {
+ left = q1.front();
+ q1.pop();
+ right = q2.front();
+ q2.pop();
+ if (left == NULL && right == NULL)
+ continue;
+ if (left == NULL || right == NULL)
+ return false;
+ if (left->val != right->val)
+ return false;
+ q1.push(left->left);
+ q1.push(left->right);
+ q2.push(right->right);
+ q2.push(right->left);
+ }
+ return true;
+ }
+};