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55 lines
3.7 KiB
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55 lines
3.7 KiB
HTML
<p>There is an ATM machine that stores banknotes of <code>5</code> denominations: <code>20</code>, <code>50</code>, <code>100</code>, <code>200</code>, and <code>500</code> dollars. Initially the ATM is empty. The user can use the machine to deposit or withdraw any amount of money.</p>
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<p>When withdrawing, the machine prioritizes using banknotes of <strong>larger</strong> values.</p>
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<ul>
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<li>For example, if you want to withdraw <code>$300</code> and there are <code>2</code> <code>$50</code> banknotes, <code>1</code> <code>$100</code> banknote, and <code>1</code> <code>$200</code> banknote, then the machine will use the <code>$100</code> and <code>$200</code> banknotes.</li>
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<li>However, if you try to withdraw <code>$600</code> and there are <code>3</code> <code>$200</code> banknotes and <code>1</code> <code>$500</code> banknote, then the withdraw request will be rejected because the machine will first try to use the <code>$500</code> banknote and then be unable to use banknotes to complete the remaining <code>$100</code>. Note that the machine is <strong>not</strong> allowed to use the <code>$200</code> banknotes instead of the <code>$500</code> banknote.</li>
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</ul>
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<p>Implement the ATM class:</p>
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<ul>
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<li><code>ATM()</code> Initializes the ATM object.</li>
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<li><code>void deposit(int[] banknotesCount)</code> Deposits new banknotes in the order <code>$20</code>, <code>$50</code>, <code>$100</code>, <code>$200</code>, and <code>$500</code>.</li>
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<li><code>int[] withdraw(int amount)</code> Returns an array of length <code>5</code> of the number of banknotes that will be handed to the user in the order <code>$20</code>, <code>$50</code>, <code>$100</code>, <code>$200</code>, and <code>$500</code>, and update the number of banknotes in the ATM after withdrawing. Returns <code>[-1]</code> if it is not possible (do <strong>not</strong> withdraw any banknotes in this case).</li>
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</ul>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input</strong>
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["ATM", "deposit", "withdraw", "deposit", "withdraw", "withdraw"]
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[[], [[0,0,1,2,1]], [600], [[0,1,0,1,1]], [600], [550]]
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<strong>Output</strong>
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[null, null, [0,0,1,0,1], null, [-1], [0,1,0,0,1]]
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<strong>Explanation</strong>
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ATM atm = new ATM();
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atm.deposit([0,0,1,2,1]); // Deposits 1 $100 banknote, 2 $200 banknotes,
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// and 1 $500 banknote.
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atm.withdraw(600); // Returns [0,0,1,0,1]. The machine uses 1 $100 banknote
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// and 1 $500 banknote. The banknotes left over in the
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// machine are [0,0,0,2,0].
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atm.deposit([0,1,0,1,1]); // Deposits 1 $50, $200, and $500 banknote.
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// The banknotes in the machine are now [0,1,0,3,1].
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atm.withdraw(600); // Returns [-1]. The machine will try to use a $500 banknote
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// and then be unable to complete the remaining $100,
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// so the withdraw request will be rejected.
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// Since the request is rejected, the number of banknotes
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// in the machine is not modified.
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atm.withdraw(550); // Returns [0,1,0,0,1]. The machine uses 1 $50 banknote
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// and 1 $500 banknote.</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>banknotesCount.length == 5</code></li>
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<li><code>0 <= banknotesCount[i] <= 10<sup>9</sup></code></li>
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<li><code>1 <= amount <= 10<sup>9</sup></code></li>
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<li>At most <code>5000</code> calls <strong>in total</strong> will be made to <code>withdraw</code> and <code>deposit</code>.</li>
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<li>At least <strong>one</strong> call will be made to each function <code>withdraw</code> and <code>deposit</code>.</li>
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</ul>
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