[강희찬] WEEK 2 Solution #356
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Contributor
HC-kang
commented
Aug 22, 2024
•
HC-kang
commented
- Valid Anagram
- Counting Bits
- Encode and Decode Strings
- Construct Binary Tree From Preorder And Inorder Traversal
- Decode Ways
DaleSeo
approved these changes
Aug 22, 2024
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| // T.C: O(N) | ||
| // S.C: O(N) |
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혹시 공간 복잡도 분석하실 때 문자열 슬라이싱에 들어가는 메모리를 고려하셨을까요?
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@DaleSeo 엇 중요한 부분 짚어주셔서 감사합니다 달레님!
슬라이스될 때 마다 복제되는 길이가 대략 절반�씩 줄어 들거라고 생각했는데, 최악의 경우에는 n번의 순회동안 n-1, n-2...1씩 복사를 하겠네요
그렇다면 O(n^2)가 맞을 것 같습니다!
kjb512
approved these changes
Aug 24, 2024
Comment on lines
+16
to
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| if (preorder.length === 0 || inorder.length === 0) { | ||
| return null; | ||
| } | ||
| const root = new TreeNode(preorder[0]); | ||
| const idx = inorder.indexOf(preorder[0]); | ||
| root.left = buildTree(preorder.slice(1, idx + 1), inorder.slice(0, idx)); | ||
| root.right = buildTree(preorder.slice(idx + 1), inorder.slice(idx + 1)); | ||
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| return root; |
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