[LeetCode]Excel Sheet Column Number

没啥好说的题，代码如下：

	class Solution {
	public:
	int titleToNumber(string s) {
	int res = 0, base = 1, len = s.size();
	for(int i = len - 1; i >= 0; --i)
	{
	res += (s[i] - 'A' + 1) * base;
	base *= 26;
	}
	return res;
	}
	};

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