[PG-42586]docs: add 42586 description #3
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📌 [feat] 기능 개발 문제 풀이 - 김동엽
🔍 변경 내용
💡 의도
📝 기타
solution()함수는 Stack을 사용한 방식으로 비교용 추가✅ 체크리스트