p171

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LeetCode 171 Excel Sheet Column Number 题解

1.题目：

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28

题意：

26进制

2.解题思路:

26进制

3.代码

[title] [] [url] [link text]
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package leetcode;



public class p171 {
	public static void main(String[] args) {
		int ans = 0;
		String s = "AC";
		ans = titleToNumber(s);
		System.out.println(ans);

	}

	public static int titleToNumber(String s) {
		int ans = 0;

		for (int i = s.length() - 1; i >= 0; i--) {
			ans = (int) (ans + (s.charAt(i) - 'A' + 1)
					* Math.pow(26, s.length() - 1 - i));
		}
		return ans;
	}

}



4.一些总结：