Implement Rand10() Using Rand7() LeetCode solution in C++

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class Solution {
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 public:
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  int rand10() {
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    while (true) {
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      int col = rand7();
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      int last_row_tak = (rand7() - 1) * 7;
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      int val = last_row_tak + col;
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      if (val <= 40) {
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        return (val - 1) % 10 + 1;
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      }
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    }
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  }
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};