Among the N! permutations of length N, how many satisfy |a_i − i| ≠ K
Constraints: 2 ≤ N ≤ 2000
1 ≤ K ≤ N − 1
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Among permutations of length N, how many satisfy |a_i − i| ≠ K
Among the N! permutations of length N, how many satisfy |a_i − i| ≠ K
Constraints: 2 ≤ N ≤ 2000
1 ≤ K ≤ N − 1
Rev. | Lang. | By | When | Δ | Comment | |
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en4 | elizabeth_zou_fanboi | 2024-11-08 20:51:00 | 112 | |||
en3 | elizabeth_zou_fanboi | 2024-11-08 20:02:58 | 4 | Tiny change: 'N ≤ 2000\n1 ≤ K ≤ ' -> 'N ≤ 2000\n\n\n1 ≤ K ≤ ' (published) | ||
en2 | elizabeth_zou_fanboi | 2024-11-08 20:02:30 | 4 | Tiny change: '− i| ≠ K\nConstrai' -> '− i| ≠ K\n\n\nConstrai' (saved to drafts) | ||
en1 | elizabeth_zou_fanboi | 2024-11-08 20:02:12 | 174 | Initial revision (published) |
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