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Excel Sheet Column Number

Change-Id: Ib63bab271f501a61843472d94861dfceff692598

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	`1`	`+/*`
	`2`	`+ Author: King, wangjingui@outlook.com`
	`3`	`+ Date: Jul 11, 2013`
	`4`	`+ Problem: Unique Binary Search Trees II`
	`5`	`+ Difficulty: Medium`
	`6`	`+ Source: https://oj.leetcode.com/problems/excel-sheet-column-number/`
	`7`	`+ Notes:`
	`8`	`+ Related to question Excel Sheet Column Title`
	`9`	`+`
	`10`	`+ Given a column title as appear in an Excel sheet, return its corresponding column number.`
	`11`	`+`
	`12`	`+ For example:`
	`13`	`+`
	`14`	`+ A -> 1`
	`15`	`+ B -> 2`
	`16`	`+ C -> 3`
	`17`	`+ ...`
	`18`	`+ Z -> 26`
	`19`	`+ AA -> 27`
	`20`	`+ AB -> 28`
	`21`	`+`
	`22`	`+ Solution: 1. ...`
	`23`	`+*/`
	`24`	`+`
	`25`	`+publicclassSolution {`
	`26`	`+publicinttitleToNumber(Strings) {`
	`27`	`+intres =0;`
	`28`	`+if (s.length() ==0)return0;`
	`29`	`+for (inti =0;i <s.length(); ++i) {`
	`30`	`+res =res *26 +s.charAt(i) -'A' +1;`
	`31`	`+ }`
	`32`	`+returnres;`
	`33`	`+ }`
	`34`	`+}`

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