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Commitc57cf46

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Update combinations-of-a-phone-number.md
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‎articles/combinations-of-a-phone-number.md

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##1.Bactracking
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##1.Backtracking
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* Time complexity: $O(n * 4 ^ n)$
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* Space complexity:
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* $O(n)$ extra space.
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* $O(n * 4 ^ n)$ space for the output list.
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* $O(n * 4 ^ n)$ space for the output list.

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