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889. construct binary tree according to preorder and postorder traversal
2022-06-11 02:22:00 【Melody2050】
Blog explanation https://grandyang.com/leetcode/889/
The time complexity of a normal recursive approach is O(n^2), But at the end of the paper, we give the stack implementation O(n) Time complexity solution . But the answer is stuck to leetcode There will be a mistake .
Optimization of recursive approach , Can be introduced hashmap The nodes -> Index save , Appropriately speed up the search .
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