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資訊專欄INFORMATION COLUMN

[Leetcode] Excel Sheet Column Title Number Convers

JowayYoung / 1429人閱讀

摘要：進(jìn)制復(fù)雜度時(shí)間空間思路得到數(shù)字，其實(shí)就是把進(jìn)制的數(shù)轉(zhuǎn)換為進(jìn)制的數(shù)。算法就是基本的進(jìn)制轉(zhuǎn)換方法，從后往前第位的值乘上。不過因?yàn)槭牵皇?，相?dāng)于進(jìn)制的數(shù)都整體減，才能對(duì)應(yīng)上從開始的十進(jìn)制數(shù)。

Excel Sheet Column Number 
Related to question Excel Sheet Column Title


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
26進(jìn)制 復(fù)雜度

時(shí)間 O(N) 空間 O(1)

思路

得到數(shù)字，其實(shí)就是把26進(jìn)制的數(shù)轉(zhuǎn)換為10進(jìn)制的數(shù)。算法就是基本的進(jìn)制轉(zhuǎn)換方法，從后往前第n位的值乘上26^(n-1)。這里26進(jìn)制數(shù)是1開始的，即A是1。

代碼 
public class Solution {
    public int titleToNumber(String s) {
        int num = 0, pow = 1;
        for(int i = s.length() - 1; i >= 0 ; i--){
            num += (s.charAt(i) - "A" + 1)*pow;
            pow *= 26;
        }
        return num;
    }
}
Excel Sheet Column Title 
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
26進(jìn)制 復(fù)雜度

時(shí)間 O(N) 空間 O(1)

思路

把10進(jìn)制的轉(zhuǎn)換成26進(jìn)制，做法是除26取余，一直除到0，最后把余數(shù)逆序一下就行了。不過因?yàn)锳是1，而不是0，相當(dāng)于26進(jìn)制的數(shù)都整體減1，才能對(duì)應(yīng)上從0開始的十進(jìn)制數(shù)。

代碼 
public class Solution {
    public String convertToTitle(int n) {
        StringBuilder sb = new StringBuilder();
        while(n != 0){
            sb.append((char)("A" + (n - 1) % 26));
            n = (n - 1) / 26;
        }
        return sb.reverse().toString();
    }
}

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