leetcode第171题-Excel Sheet Column Number

这道题是把字符串类型的类似于表格的字母对应到数字，题目意思很简单，我一开始还很把每个字母映射到数字，后来看到别人用这个方法计算每个字母的值s[i]-‘A‘，这么简单的方法不用简直是可惜。

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

时间： 2024-10-09 22:32:06

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题意:天啊!我竟然看不懂题意,还去翻别人的代码才懂!给定一个字符串,求该字符串二十六进制的总值. 思路:'A'~'Z'就是1到26,"AA"=26+1=27,"BA"=26*2+1=53,"CBA"=26*26*3+26*2+1.相当于321(十进制),那么就是10*10*3+10*2+1,说第3条式子,C在第3位,在第1位时就是1~26的值了,也就是3,在第2位时就是将3*26了,再第3位时就是将3*26*26了:同理B就是2*26啦,A就是1