LeetCode之Excel Sheet Column Title
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题意:
Given a positive integer, return its corresponding column title as appear in an Excel sheet.
For example:
1 -> A 2 -> B 3 -> C ... 26 -> Z 27 -> AA 28 -> AB
给出一个正整数,返回相应的列标题出现在一个Excel表。
仔细观察示例,会发现1-26对应于A-Z,即十进制数转二十六进制数
Java代码:
public class Solution { public String convertToTitle(int n) { if(n <= 0) return null; String result = ""; while(n != 0) { result = (char)('A' + (n - 1) % 26) + result; n = (n - 1) / 26; } return result; }}
C++代码:
class Solution {public: string convertToTitle(int n) { if(n <= 0) return NULL; string result; while(n) { result = (char)((n - 1) % 26 + 'A') + result; n = (n - 1) / 26; } return result; }};
解题思路:10进制数转26进制数
注意:
result = (char)('A' + (n - 1) % 26) + result;
这行代码不能替换为
result += (char)('A' + (n - 1) % 26);//等同于result = result + (char)('A' + (n - 1) % 26);
如果替换,结果字符串顺序相反
0 0
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