171. Excel表列序號(hào) - 力扣（LeetCode） (leetcode-cn.com)

class?Solution?{

????public?int?titleToNumber(String?columnTitle)?{

????????//#26進(jìn)制轉(zhuǎn)10進(jìn)制

????????char[]?chars?=?columnTitle.toCharArray();

????????int?res?=?0;

????????for(int?i=0;i<chars.length;i++){

????????????res=res*26+(chars[i]-'A'+1);

????????}

????????return?res;

????}

}