6
2 1 4 2 6 7
5
其中一种方案:
→ 2 1 4 2 6 7
→ 2 1 4 2 6 2
→ 2 1 4 2 2 2
→ 2 1 1 2 2 2
→ 1 1 1 2 2 2
→ 1 1 1 1 1 1
共需要 5 步完成
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