add 413 700 scripts.

Author: everthis

413-arithmetic-slices.js

@@ -0,0 +1,24 @@
+/**
+ * @param {number[]} A
+ * @return {number}
+ */
+const numberOfArithmeticSlices = function(A) {
+  const arr = [];
+  let count = 0;
+  for (let i = 1; i < A.length - 1; i++) {
+    if (A[i] - A[i - 1] === A[i + 1] - A[i]) {
+      count += 1;
+    } else {
+      arr.push(count);
+      count = 0;
+    }
+  }
+  arr.push(count);
+  return arr.reduce((ac, el) => ac + calc(el), 0);
+};
+
+function calc(num) {
+  return (num * (num + 1)) / 2;
+}
+
+console.log(numberOfArithmeticSlices([1, 2, 3, 4]));

700-search-in-a-binary-search-tree.js

@@ -0,0 +1,23 @@
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val) {
+ *     this.val = val;
+ *     this.left = this.right = null;
+ * }
+ */
+/**
+ * @param {TreeNode} root
+ * @param {number} val
+ * @return {TreeNode}
+ */
+const searchBST = function(root, val) {
+  if (root === null) return [];
+
+  if (root.val === val) {
+    return root;
+  } else if (root.val < val) {
+    return searchBST(root.right, val);
+  } else {
+    return searchBST(root.left, val);
+  }
+};