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I'm not sure if I understand your question. I use buckets in this problem. Using buckets to solve a problem is a common trick and I had learned it from various algorithms, so I applied it to this problem.
Beautiful Pairs
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I'm not sure if I understand your question. I use buckets in this problem. Using buckets to solve a problem is a common trick and I had learned it from various algorithms, so I applied it to this problem.
HackerRank solutions.