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2026-11-06 21:43:33 +05:30

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Iterative inorder on the sample tree, step by step
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step | action | stack (bottom..top) | output so far
1 | push 1 | [1] | []
2 | push 2 | [1 2] | []
3 | push 4 | [1 2 4] | []
4 | pop 4, visit | [1 2] | [4]
5 | pop 2, visit | [1] | [4 2]
6 | push 5 | [1 5] | [4 2]
7 | push 7 | [1 5 7] | [4 2]
8 | pop 7, visit | [1 5] | [4 2 7]
9 | pop 5, visit | [1] | [4 2 7 5]
10 | pop 1, visit | [] | [4 2 7 5 1]
11 | push 3 | [3] | [4 2 7 5 1]
12 | pop 3, visit | [] | [4 2 7 5 1 3]
13 | push 6 | [6] | [4 2 7 5 1 3]
14 | push 8 | [6 8] | [4 2 7 5 1 3]
15 | pop 8, visit | [6] | [4 2 7 5 1 3 8]
16 | pop 6, visit | [] | [4 2 7 5 1 3 8 6]
17 | push 9 | [9] | [4 2 7 5 1 3 8 6]
18 | pop 9, visit | [] | [4 2 7 5 1 3 8 6 9]