[leetcode-171]Excel Sheet Column Number(c)

问题描述：这里写链接内容

代码如下：４ｍｓ

int titleToNumber(char* s) {    int length = strlen(s);    int res = 0;    for(int i = 0;i<length;i++){        res = res*26 + s[i]-'A'+1;    }    return res;}