Minimum Garden Perimeter to Collect Enough Apples LeetCode solution in C++

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class Solution {
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 public:
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  long long minimumPerimeter(long long neededApples) {
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    long long i = 0;
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    long long x = 0;
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    while (x < neededApples) {
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      x += (long long)12 * pow(i, 2);
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      ++i;
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    }
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    return (long long)(i - 1) * 8;
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  }
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};