feat: solved 숫자카드 2 / binary serach with lower&upper bound #131
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이분 탐색 시 수열 안에 찾고자하는 값이 여러개 있을 경우
lower bound 와 upper bound의 개념을 활용해 찾고자하는 값의 갯수를 구할 수 있음.