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given n, how to find the number of different ways to write n as the sum of 1, 3, 4 in ruby？
| Author | Votes | Δ |
|---|---|---|
| Karoly Horvath | 2 | +0.57 |
| sawa | 2 | +0.57 |
| Cary Swoveland | 1 | -1.14 |
| user2897559 | 0 | 0.00 |
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