
[理工] DS tree

為什麼這兩個等價
等價的條件是什麼
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推
10/07 20:26, , 1F
10/07 20:26, 1F
→
10/07 20:26, , 2F
10/07 20:26, 2F
推
10/07 22:16, , 3F
10/07 22:16, 3F
→
10/07 22:16, , 4F
10/07 22:16, 4F
→
10/07 22:43, , 5F
10/07 22:43, 5F