Calculate Money in Leetcode Bank LeetCode solution in C++

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class Solution {
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 public:
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  int totalMoney(int n) {
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    int res = 0;
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    for (int i = 1, c = 1; i <= n; i++, c++) {
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      res += c;
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      c = i % 7 ? c : (i / 7);
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    }
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    return res;
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  }
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};