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나름 간단하게 풀어볼려고 했는데.... 뭔가 추가적인게 계속나오고 복잡해지더라고요.
겨우겨우 풀고나서 다른 사람 풀이 보니까.. 난 뭐했지 싶을 정도로 간결하면서 괜찮아 보이는게 있길래 추가 포함하여 올려봅니다.
wrapper class의 unboxing , boxing 자체로도 비용이 많이 드는걸 알지만.. 우선 어떻게서든 풀어보자는 생각으로 풀었습니다.
다양한 풀이 방식을 접근하도록 노력해보겠습니다.