I was doing this problem on Spoj. The solution of this problem is that first player always wins.
Can anyone give me proof of this?
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| 2 | jiangly | 3814 |
| 3 | jqdai0815 | 3682 |
| 4 | Benq | 3529 |
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| 6 | ksun48 | 3517 |
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| 8 | hos.lyric | 3399 |
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| 9 | Um_nik | 3392 |
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