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19 lines
648 B
Markdown
19 lines
648 B
Markdown
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# [171. Excel Sheet Column Number](https://leetcode.com/problems/excel-sheet-column-number/description/)
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# 思路
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第[168题](https://leetcode.com/problems/excel-sheet-column-title/description/)是将10进制转换为26进制，这题是将26进制转换为10进制.
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例：将k进制数"abcd"转换为10进制数：`res = d * k^0 + c * k^1 + b * k^2 + a * k^3`.
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# C++
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```
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class Solution {
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public:
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int titleToNumber(string s) {
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int res = 0, multiplier = 1;
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for(int i = s.size() - 1; i >= 0; i--){
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res += (int)(s[i] - 'A' + 1) * multiplier;
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multiplier *= 26;
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}
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return res;
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}
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};
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```
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