[leetcode]168. Excel Sheet Column Title -- JavaScript 代码
2016-08-22 10:22
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/** * @param {number} n * @return {string} */ var convertToTitle = function(n) { // fromCharCode(); if(n===0){ return 0; } var str = []; while(n>0){ n--; code = String.fromCharCode(n%26+65); n = Math.floor(n/26); str.push(code); } return str.reverse().join(""); };
这道题的核心是使用了JS的方法String.fromCharCode,它可以将数字转化为对应的ascii码。
另外,这道题相当于是一个26进制的转化,但是给的题目比较迷惑,因为没有0,所以我们必须自己手动转化,将A看作0,将Z看做25…所以n–这一步是必须做的。
还有一道题和这道题目的转换方向相反,在这里也给出代码:
171. Excel Sheet Column Number:
/** * @param {string} s * @return {number} */ var titleToNumber = function(s) {// 26进制问题 var len = s.length; if(len===0){ return 0; } var sum = 0; for(var i=0;i<len;i++){ var cur = s.charCodeAt(i)-64; sum = sum * 26 + cur; } return sum; };
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