Create 1022-sum-of-root-to-leaf-binary-numbers.js

Author: everthis

1022-sum-of-root-to-leaf-binary-numbers.js

@@ -0,0 +1,29 @@
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val) {
+ *     this.val = val;
+ *     this.left = this.right = null;
+ * }
+ */
+/**
+ * @param {TreeNode} root
+ * @return {number}
+ */
+const sumRootToLeaf = function(root) {
+  if(root == null) return 0
+  const res = []
+  dfs(root, 0, res)
+  const mod = Math.pow(10, 9) + 7
+  return res.reduce((ac, el) => (ac + el) % mod ,0)  
+};
+
+function dfs(node, val, res) {
+  const mod = Math.pow(10, 9) + 7
+  if(node == null) return
+  val = (val * 2 + node.val) % mod
+  if(node.left === null && node.right === null) {
+    res.push(val)
+  }
+  dfs(node.left, val, res)
+  dfs(node.right, val, res)
+}