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feat: add question 1323
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1323.6 和 9 组成的最大数字.js

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/**
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* 1. 找到第1个6改为9即可
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*/
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/**
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* @param {number} num
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* @return {number}
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*/
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var maximum69Number = function(num) {
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const chars = num.toString().split('');
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for (let i = 0; i < chars.length; i++) {
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if (chars[i] === '6') {
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chars[i] = '9';
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break;
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}
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}
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return chars.join('');
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};

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