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🅰 설계
<원소 값, 순서>를 저장하는 map (결과를 출력할 때 O(1)에 access 가능)
정렬되어 있는 배열에서 upper-bound를 이용하여 중복되는 원소를 건너뛰는 방식으로 진행하면서 순서(cnt)를 계산했습니다. 그 순서(value)를 원소값(key)과 함께 cntMap에 저장하였습니다.
upper-bound를 직접 구현했습니다.
✅ 후기