p168

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LeetCode 168 Excel Sheet Column Title 题解

1.题目：

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

题意：

26进制

2.解题思路:

26进制

3.代码

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package leetcode;

import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Scanner;
import java.util.SortedMap;

public class p168 {
	public static void main(String[] args) {
		String ans = null;
		ans = convertToTitle(27);
		System.out.println(ans);

	}

	public static String convertToTitle(int n) {

		StringBuffer a = new StringBuffer();
		ArrayList<Integer> list = new ArrayList<Integer>();
		for (int i = n; i > 0;) {

			int p = (i - 1) % 26;
			list.add(p);
			//System.out.println(p);
			i = (i - 1) / 26;

		}
		for (int i = list.size() - 1; i >= 0; i--) {

			a.append((char) (list.get(i) + 'A'));

		}
		String ans = a.toString();
		return ans;
	}

}


4.一些总结：