leetcode 171. Excel Sheet Column Number(C语言)
2018-04-11 00:15
495 查看
第四天
贴原题:
Related to question Excel Sheet Column Title
Given a column title as appear in an Excel sheet, return its corresponding column number.
For example:
Credits:
Special thanks to @ts for adding this problem and creating all test cases.
解读与分析:
本题其实就是就是让写一个26进制,这一点我在读完题之后就发现了。然而写程序的时候完全凭脑子想,思维有点混乱,写了一个多小时才解出来,很难受……
因为A的ASCII码是65,那么A-64=1。然后把ABCD……这样等价于1,2,3,4……相应的,Z等价于26,满26进1。
接下来就是计算各位的权重,再相加就行了。看不懂的话,看一下注释吧……
贴我的C代码:
贴原题:
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
Credits:
Special thanks to @ts for adding this problem and creating all test cases.
解读与分析:
本题其实就是就是让写一个26进制,这一点我在读完题之后就发现了。然而写程序的时候完全凭脑子想,思维有点混乱,写了一个多小时才解出来,很难受……
因为A的ASCII码是65,那么A-64=1。然后把ABCD……这样等价于1,2,3,4……相应的,Z等价于26,满26进1。
接下来就是计算各位的权重,再相加就行了。看不懂的话,看一下注释吧……
贴我的C代码:
int titleToNumber(char* s) { int len=strlen(s); int output=0; for(int i=0; i<len; i++) { int temp=*(s+i)-64;//临时变量存放当前位上的值 for(int j=0; j<len-i-1; j++) { temp*=26;//当前位的值乘上此位的权重,即乘以26的乘方 } output+=temp;//把计算的权重值逐位相加 } return output; }
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