Excel Sheet Column Title LeetCode solution in C++

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class Solution {
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 public:
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  string convertToTitle(int columnNumber) {
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    string s = "";
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    while (columnNumber) {
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      char c = (columnNumber - 1) % 26 + 65;
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      s = c + s;
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      columnNumber = (columnNumber - 1) / 26;
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    }
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    return s;
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  }
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};