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Week11 counting radix_sort
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linear sort algorithm, counting sort, radix sort
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Week11 counting radix_sort
1.
Week11. Counting Sort θ
(k + n) k = 입력값의 최대 값 = 상수 각 원소보다 작은 원소의 개수를 카운팅 안정적 정렬 A[1..n]: 입력값 B[1..n]: 정렬된 결과 C[1..k]: C[n]과 같거나 작은 원소의 개수 저장 누적된 수치로 재계산 A[n-1] 부터 채워 넣기 C[4] - 1
2.
Week11. Counting Sort 1 2 3 4 C
배열을 0으로 초기화 O(k) C[n] 값을 가진 원소의 개수 세기 O(n) C 배열을 누적된 값으로 바꾸기 O(k) 정렬된 제자리 찾기 O(n + k)
3.
Week11. Radix Sort θ
(d (k + n)) d = 배열 입력값의 자리수 k = 각 자리수에 가질 수 있는 가장 큰 값 (10진수일 경우 9) 안정적인 정렬만 알고리즘에 사용 가능
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