2018-10-10 22:03:03 +00:00
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---
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id: aa2e6f85cab2ab736c9a9b24
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2021-03-15 03:20:39 +00:00
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title: 计算找零
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2018-10-10 22:03:03 +00:00
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challengeType: 5
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2020-09-07 08:17:22 +00:00
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forumTopicId: 16012
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2021-01-13 02:31:00 +00:00
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dashedName: cash-register
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2018-10-10 22:03:03 +00:00
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---
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2020-12-16 07:37:30 +00:00
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# --description--
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2018-10-10 22:03:03 +00:00
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2021-03-15 03:20:39 +00:00
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请编写一个用于收银机的函数 `checkCashRegister()`:它的第一个参数为售价 `price`、第二个参数为支付金额 `cash`、第三个参数为收银机內的金额 `cid`。
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2020-12-16 07:37:30 +00:00
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2021-03-15 03:20:39 +00:00
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`cid` 是包含货币面值的二维数组。
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2020-12-16 07:37:30 +00:00
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2021-03-15 03:20:39 +00:00
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函数 `checkCashRegister()` 应返回含有 `status` 属性和 `change` 属性的对象。
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2020-12-16 07:37:30 +00:00
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2021-03-15 03:20:39 +00:00
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如果收银机內的金额少于应找回的零钱数,或者你无法返回确切的数目时,返回 `{status: "INSUFFICIENT_FUNDS", change: []}`。
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2020-12-16 07:37:30 +00:00
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2021-03-15 03:20:39 +00:00
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如果收银机內的金额恰好等于应找回的零钱数,返回 `{status: "CLOSED", change: [...]}`,其中 `change` 的属性值就是收银机內的金额。
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2020-12-16 07:37:30 +00:00
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2021-03-15 03:20:39 +00:00
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否则,返回 `{status: "OPEN", change: [...]}`,其中 `change` 键值是应找回的零钱数,并将找零的面值由高到低排序。
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2020-12-16 07:37:30 +00:00
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2021-03-15 03:20:39 +00:00
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<table class='table table-striped'><tbody><tr><th>货币单位 Unit</th><th>面值</th></tr><tr><td>Penny</td><td>0.01 美元(PENNY)</td></tr><tr><td>Nickel</td><td>0.05 美元(NICKEL)</td></tr><tr><td>Dime</td><td>0.1 美元(DIME)</td></tr><tr><td>Quarter</td><td>0.25 美元(QUARTER)</td></tr><tr><td>Dollar</td><td>1 美元(ONE)</td></tr><tr><td>Five Dollars</td><td>5 美元(五)</td></tr><tr><td>Ten Dollars</td><td>10 美元(TEN)</td></tr><tr><td>Twenty Dollars</td><td>20 美元(TWENTY)</td></tr><tr><td>One-hundred Dollars</td><td>100美元(ONE HUNDRED)</td></tr></tbody></table>
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2021-01-12 16:18:51 +00:00
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2021-03-15 03:20:39 +00:00
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下面的抽屉里现金数组示例:
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2021-01-12 16:18:51 +00:00
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```js
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[
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["PENNY", 1.01],
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["NICKEL", 2.05],
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["DIME", 3.1],
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["QUARTER", 4.25],
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["ONE", 90],
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["FIVE", 55],
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["TEN", 20],
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["TWENTY", 60],
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["ONE HUNDRED", 100]
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]
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```
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2020-12-16 07:37:30 +00:00
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# --hints--
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2018-10-10 22:03:03 +00:00
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2021-03-15 03:20:39 +00:00
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`checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])` 应返回一个对象。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert.deepEqual(
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Object.prototype.toString.call(
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checkCashRegister(19.5, 20, [
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['PENNY', 1.01],
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['NICKEL', 2.05],
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['DIME', 3.1],
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['QUARTER', 4.25],
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['ONE', 90],
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['FIVE', 55],
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['TEN', 20],
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['TWENTY', 60],
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['ONE HUNDRED', 100]
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])
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),
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'[object Object]'
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);
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```
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2018-10-10 22:03:03 +00:00
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2021-03-15 03:20:39 +00:00
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`checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])` 应返回 `{status: "OPEN", change: [["QUARTER", 0.5]]}`。
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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assert.deepEqual(
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checkCashRegister(19.5, 20, [
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['PENNY', 1.01],
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['NICKEL', 2.05],
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['DIME', 3.1],
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['QUARTER', 4.25],
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['ONE', 90],
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['FIVE', 55],
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['TEN', 20],
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['TWENTY', 60],
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['ONE HUNDRED', 100]
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]),
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{ status: 'OPEN', change: [['QUARTER', 0.5]] }
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);
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2018-10-10 22:03:03 +00:00
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```
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2021-03-15 03:20:39 +00:00
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`checkCashRegister(3.26, 100, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]])` 应返回 `{status: "OPEN", change: [["TWENTY", 60], ["TEN", 20], ["FIVE", 15], ["ONE", 1], ["QUARTER", 0.5], ["DIME", 0.2], ["PENNY", 0.04]]}`。
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2020-12-16 07:37:30 +00:00
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```js
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assert.deepEqual(
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checkCashRegister(3.26, 100, [
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['PENNY', 1.01],
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['NICKEL', 2.05],
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['DIME', 3.1],
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['QUARTER', 4.25],
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['ONE', 90],
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['FIVE', 55],
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['TEN', 20],
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['TWENTY', 60],
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['ONE HUNDRED', 100]
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]),
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{
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status: 'OPEN',
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change: [
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['TWENTY', 60],
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['TEN', 20],
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['FIVE', 15],
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['ONE', 1],
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['QUARTER', 0.5],
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['DIME', 0.2],
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['PENNY', 0.04]
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]
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}
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);
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```
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2018-10-10 22:03:03 +00:00
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2021-03-15 03:20:39 +00:00
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`checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])` 应返回 `{status: "INSUFFICIENT_FUNDS", change: []}`。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert.deepEqual(
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checkCashRegister(19.5, 20, [
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['PENNY', 0.01],
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['NICKEL', 0],
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['DIME', 0],
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['QUARTER', 0],
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['ONE', 0],
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['FIVE', 0],
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['TEN', 0],
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['TWENTY', 0],
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['ONE HUNDRED', 0]
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]),
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{ status: 'INSUFFICIENT_FUNDS', change: [] }
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);
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```
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2018-10-10 22:03:03 +00:00
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2021-03-15 03:20:39 +00:00
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`checkCashRegister(19.5, 20, [["PENNY", 0.01], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 1], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])` 应返回 `{status: "INSUFFICIENT_FUNDS", change: []}`。
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2018-10-10 22:03:03 +00:00
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2020-12-16 07:37:30 +00:00
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```js
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assert.deepEqual(
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checkCashRegister(19.5, 20, [
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['PENNY', 0.01],
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['NICKEL', 0],
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['DIME', 0],
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['QUARTER', 0],
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['ONE', 1],
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['FIVE', 0],
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['TEN', 0],
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['TWENTY', 0],
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['ONE HUNDRED', 0]
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]),
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{ status: 'INSUFFICIENT_FUNDS', change: [] }
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);
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```
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2018-10-10 22:03:03 +00:00
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2021-03-15 03:20:39 +00:00
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`checkCashRegister(19.5, 20, [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]])` 应返回 `{status: "CLOSED", change: [["PENNY", 0.5], ["NICKEL", 0], ["DIME", 0], ["QUARTER", 0], ["ONE", 0], ["FIVE", 0], ["TEN", 0], ["TWENTY", 0], ["ONE HUNDRED", 0]]}`。
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2020-09-07 08:17:22 +00:00
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2018-10-10 22:03:03 +00:00
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```js
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2020-12-16 07:37:30 +00:00
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assert.deepEqual(
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checkCashRegister(19.5, 20, [
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['PENNY', 0.5],
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['NICKEL', 0],
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['DIME', 0],
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['QUARTER', 0],
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['ONE', 0],
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['FIVE', 0],
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['TEN', 0],
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['TWENTY', 0],
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['ONE HUNDRED', 0]
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]),
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{
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status: 'CLOSED',
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change: [
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['PENNY', 0.5],
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['NICKEL', 0],
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['DIME', 0],
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['QUARTER', 0],
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['ONE', 0],
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['FIVE', 0],
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['TEN', 0],
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['TWENTY', 0],
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['ONE HUNDRED', 0]
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]
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}
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);
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2018-10-10 22:03:03 +00:00
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```
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2020-08-13 15:24:35 +00:00
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2021-01-13 02:31:00 +00:00
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# --seed--
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## --seed-contents--
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```js
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function checkCashRegister(price, cash, cid) {
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var change;
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return change;
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}
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checkCashRegister(19.5, 20, [["PENNY", 1.01], ["NICKEL", 2.05], ["DIME", 3.1], ["QUARTER", 4.25], ["ONE", 90], ["FIVE", 55], ["TEN", 20], ["TWENTY", 60], ["ONE HUNDRED", 100]]);
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```
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2020-12-16 07:37:30 +00:00
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# --solutions--
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2021-01-13 02:31:00 +00:00
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```js
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var denom = [
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{ name: 'ONE HUNDRED', val: 100},
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{ name: 'TWENTY', val: 20},
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{ name: 'TEN', val: 10},
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{ name: 'FIVE', val: 5},
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{ name: 'ONE', val: 1},
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{ name: 'QUARTER', val: 0.25},
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{ name: 'DIME', val: 0.1},
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{ name: 'NICKEL', val: 0.05},
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{ name: 'PENNY', val: 0.01}
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];
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function checkCashRegister(price, cash, cid) {
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var output = {status: null, change: []};
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var change = cash - price;
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var register = cid.reduce(function(acc, curr) {
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acc.total += curr[1];
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acc[curr[0]] = curr[1];
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return acc;
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}, {total: 0});
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if(register.total === change) {
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output.status = 'CLOSED';
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output.change = cid;
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return output;
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}
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if(register.total < change) {
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output.status = 'INSUFFICIENT_FUNDS';
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return output;
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}
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var change_arr = denom.reduce(function(acc, curr) {
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var value = 0;
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while(register[curr.name] > 0 && change >= curr.val) {
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change -= curr.val;
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register[curr.name] -= curr.val;
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value += curr.val;
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change = Math.round(change * 100) / 100;
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}
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if(value > 0) {
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acc.push([ curr.name, value ]);
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}
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return acc;
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}, []);
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if(change_arr.length < 1 || change > 0) {
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output.status = 'INSUFFICIENT_FUNDS';
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return output;
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}
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output.status = 'OPEN';
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output.change = change_arr;
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return output;
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}
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```
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