Add solution #2043

Author: JoshCrozier

README.md

@@ -1,4 +1,4 @@
-# 1,704 LeetCode solutions in JavaScript
+# 1,705 LeetCode solutions in JavaScript
 
 [https://leetcodejavascript.com](https://leetcodejavascript.com)
 
@@ -1566,6 +1566,7 @@
 2039|[The Time When the Network Becomes Idle](./solutions/2039-the-time-when-the-network-becomes-idle.js)|Medium|
 2040|[Kth Smallest Product of Two Sorted Arrays](./solutions/2040-kth-smallest-product-of-two-sorted-arrays.js)|Hard|
 2042|[Check if Numbers Are Ascending in a Sentence](./solutions/2042-check-if-numbers-are-ascending-in-a-sentence.js)|Easy|
+2043|[Simple Bank System](./solutions/2043-simple-bank-system.js)|Medium|
 2047|[Number of Valid Words in a Sentence](./solutions/2047-number-of-valid-words-in-a-sentence.js)|Easy|
 2053|[Kth Distinct String in an Array](./solutions/2053-kth-distinct-string-in-an-array.js)|Medium|
 2071|[Maximum Number of Tasks You Can Assign](./solutions/2071-maximum-number-of-tasks-you-can-assign.js)|Hard|

solutions/2043-simple-bank-system.js

@@ -0,0 +1,71 @@
+/**
+ * 2043. Simple Bank System
+ * https://leetcode.com/problems/simple-bank-system/
+ * Difficulty: Medium
+ *
+ * You have been tasked with writing a program for a popular bank that will automate all its
+ * incoming transactions (transfer, deposit, and withdraw). The bank has n accounts numbered
+ * from 1 to n. The initial balance of each account is stored in a 0-indexed integer array
+ * balance, with the (i + 1)th account having an initial balance of balance[i].
+ *
+ * Execute all the valid transactions. A transaction is valid if:
+ * - The given account number(s) are between 1 and n, and
+ * - The amount of money withdrawn or transferred from is less than or equal to the balance
+ *   of the account.
+ *
+ * Implement the Bank class:
+ * - Bank(long[] balance) Initializes the object with the 0-indexed integer array balance.
+ * - boolean transfer(int account1, int account2, long money) Transfers money dollars from the
+ *   account numbered account1 to the account numbered account2. Return true if the transaction
+ *   was successful, false otherwise.
+ * - boolean deposit(int account, long money) Deposit money dollars into the account numbered
+ *   account. Return true if the transaction was successful, false otherwise.
+ * - boolean withdraw(int account, long money) Withdraw money dollars from the account numbered
+ *   account. Return true if the transaction was successful, false otherwise.
+ */
+
+/**
+ * @param {number[]} balance
+ */
+var Bank = function(balance) {
+  this.accounts = balance;
+};
+
+/**
+ * @param {number} account1
+ * @param {number} account2
+ * @param {number} money
+ * @return {boolean}
+ */
+Bank.prototype.transfer = function(account1, account2, money) {
+  if (account1 > this.accounts.length || account2 > this.accounts.length) return false;
+  if (this.accounts[account1 - 1] < money) return false;
+
+  this.accounts[account1 - 1] -= money;
+  this.accounts[account2 - 1] += money;
+  return true;
+};
+
+/**
+ * @param {number} account
+ * @param {number} money
+ * @return {boolean}
+ */
+Bank.prototype.deposit = function(account, money) {
+  if (account > this.accounts.length) return false;
+
+  this.accounts[account - 1] += money;
+  return true;
+};
+
+/**
+ * @param {number} account
+ * @param {number} money
+ * @return {boolean}
+ */
+Bank.prototype.withdraw = function(account, money) {
+  if (account > this.accounts.length || this.accounts[account - 1] < money) return false;
+
+  this.accounts[account - 1] -= money;
+  return true;
+};