Create 1457.二叉树中的伪回文路径.js

Author: yinxin630

1457.二叉树中的伪回文路径.js

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+// LeetCode 有 BUG, 最后一个测试用例直接 return 0 都会超时
+
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val, left, right) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.left = (left===undefined ? null : left)
+ *     this.right = (right===undefined ? null : right)
+ * }
+ */
+/**
+ * @param {TreeNode} root
+ * @return {number}
+ */
+var pseudoPalindromicPaths  = function(root) {
+    const count = new Array(10).fill(0);
+    let ji = 0;
+    let result = 0;
+    function dfs(node) {
+        if (node === null) {
+            return;
+        }
+        count[node.val]++;
+        const x = count[node.val] % 2 === 1 ? 1 : -1;
+        ji += x;
+        if (!node.left && !node.right) {
+            if (ji <= 1) {
+                result++;
+            }
+        } else {
+            node.left && dfs(node.left);
+            node.right && dfs(node.right);
+        }
+        count[node.val]--;
+        ji -= x;
+    }
+    dfs(root);
+    return result;
+};