Among the N! permutations of length N, how many satisfy |a_i − i| ≠ K
Constraints: 2 ≤ N ≤ 2000
1 ≤ K ≤ N − 1
# | User | Rating |
---|---|---|
1 | tourist | 4009 |
2 | jiangly | 3823 |
3 | Benq | 3738 |
4 | Radewoosh | 3633 |
5 | jqdai0815 | 3620 |
6 | orzdevinwang | 3529 |
7 | ecnerwala | 3446 |
8 | Um_nik | 3396 |
9 | ksun48 | 3390 |
10 | gamegame | 3386 |
# | User | Contrib. |
---|---|---|
1 | cry | 164 |
1 | maomao90 | 164 |
3 | Um_nik | 163 |
4 | atcoder_official | 160 |
5 | -is-this-fft- | 158 |
6 | awoo | 157 |
7 | adamant | 156 |
8 | TheScrasse | 154 |
8 | nor | 154 |
10 | djm03178 | 153 |
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 | |
---|---|---|---|---|---|---|
en7 | elizabeth_zou_fanboi | 2024-11-09 21:04:04 | 2783 | Reverted to en5 | ||
en6 | elizabeth_zou_fanboi | 2024-11-09 21:03:06 | 2783 | Reverted to en4 | ||
en5 | elizabeth_zou_fanboi | 2024-11-09 21:00:28 | 2783 | |||
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) |
Name |
---|