115. Distinct Subsequences
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Approach 1: 2D DP¶
- Time: $O(mn)$
- Space: $O(mn)$
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 |
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Approach 2: 1D DP¶
- Time: $O(mn)$
- Space: $O(n)$
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 |
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
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1 2 3 4 5 6 7 8 9 10 11 12 |
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