leecode 解题总结：171. Excel Sheet Column Number

#include <iostream>#include <stdio.h>#include <vector>#include <string>using namespace std;/*问题:Related to question Excel Sheet Column TitleGiven 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 	AZ -> 52	BA -> 53分析：此题是excel标题转化为数字。之前数字转化为标题是:n-- , 'A' + n % 26 , n/=26应该可以翻过来，获取高位字母'A'，转化为字母 - 'A' + 1,然后乘以26输入：AAABAAZZA输出:7035352261关键:1 不断获取每一位字母，用该字母-'A'+1，然后乘以26的对应次方，累加即可*/class Solution {public:    int titleToNumber(string s) {        if(s.empty())		{			return 0;		}		int len = s.length();		int result = 0;		int value = 0;		for(int i = 0; i < len ; i++)		{			value = s.at(i) - 'A' + 1;			result = result * 26 + value;		}		return result;    }};void PRocess(){	 vector<int> nums;	 string value;	 int num;	 Solution solution;	 vector<int> result;	 while(cin >> value )	 {		 num = solution.titleToNumber(value);		 cout << num << endl;	 }}int main(int argc , char* argv[]){	process();	getchar();	return 0;}