ee1e8abd87
* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
121 lines
2.5 KiB
Markdown
121 lines
2.5 KiB
Markdown
---
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id: 5900f37d1000cf542c50fe90
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title: 问题17：数字字母计数
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challengeType: 5
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videoUrl: ''
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dashedName: problem-17-number-letter-counts
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---
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# --description--
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如果数字1到5用文字写出：一，二，三，四，五，则总共使用3 + 3 + 5 + 4 + 4 = 19个字母。如果从1到包含`limit`所有数字都用文字写出，那么会使用多少个字母？ **注意：** 不要计算空格或连字符。例如，342（三百四十二）包含23个字母，115（一百一十五）包含20个字母。在写出数字时使用“和”符合英国的用法。
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# --hints--
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`numberLetterCounts(5)`应返回19。
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```js
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assert.strictEqual(numberLetterCounts(5), 19);
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```
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`numberLetterCounts(150)`应该返回1903。
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```js
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assert.strictEqual(numberLetterCounts(150), 1903);
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```
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`numberLetterCounts(1000)`应该返回21124。
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```js
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assert.strictEqual(numberLetterCounts(1000), 21124);
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```
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# --seed--
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## --seed-contents--
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```js
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function numberLetterCounts(limit) {
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return true;
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}
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numberLetterCounts(5);
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```
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# --solutions--
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```js
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function numberLetterCounts(limit) {
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const dictionary = {
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0: '',
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1: 'one',
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2: 'two',
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3: 'three',
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4: 'four',
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5: 'five',
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6: 'six',
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7: 'seven',
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8: 'eight',
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9: 'nine',
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10: 'ten',
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11: 'eleven',
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12: 'twelve',
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13: 'thirteen',
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14: 'fourteen',
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15: 'fifteen',
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16: 'sixteen',
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17: 'seventeen',
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18: 'eighteen',
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19: 'nineteen',
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20: 'twenty',
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30: 'thirty',
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40: 'forty',
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50: 'fifty',
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60: 'sixty',
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70: 'seventy',
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80: 'eighty',
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90: 'ninety',
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1000: 'onethousand'
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};
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let numString = '';
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function convertToString(num) {
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// check dictionary for number
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if (dictionary[num]) {
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return dictionary[num];
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} else {
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const hundreds = Math.floor(num / 100);
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const tens = Math.floor((num / 10) % 10) * 10;
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const remainder = num % 10;
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let tempStr = '';
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if (hundreds === 0) {
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tempStr += dictionary[tens] + dictionary[remainder];
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} else {
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tempStr += dictionary[hundreds] + 'hundred';
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if (tens !== 0 || remainder !== 0) {
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tempStr += 'and';
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}
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if (tens < 20) {
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const lessThanTwenty = tens + remainder;
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tempStr += dictionary[lessThanTwenty];
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} else {
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tempStr += dictionary[tens] + dictionary[remainder];
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}
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}
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return tempStr;
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}
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}
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for (let i = 1; i <= limit; i++) {
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numString += convertToString(i);
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}
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return numString.length;
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}
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```
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