Among the N! permutations of length N, how many satisfy |a_i − i| ≠ K Constraints: 2 ≤ N ≤ 2000 1 ≤ K ≤ N − 1
→ Pay attention
→ Top rated
| # | User | Rating |
|---|---|---|
| 1 | tourist | 3856 |
| 2 | jiangly | 3747 |
| 3 | orzdevinwang | 3706 |
| 4 | jqdai0815 | 3682 |
| 5 | ksun48 | 3591 |
| 6 | gamegame | 3477 |
| 7 | Benq | 3468 |
| 8 | Radewoosh | 3462 |
| 9 | ecnerwala | 3451 |
| 10 | heuristica | 3431 |
→ Top contributors
| # | User | Contrib. |
|---|---|---|
| 1 | cry | 167 |
| 2 | -is-this-fft- | 162 |
| 3 | Dominater069 | 160 |
| 4 | Um_nik | 158 |
| 5 | atcoder_official | 157 |
| 6 | Qingyu | 156 |
| 7 | adamant | 151 |
| 7 | djm03178 | 151 |
| 7 | luogu_official | 151 |
| 10 | awoo | 146 |
→ Find user
→ Recent actions
Among permutations of length N, how many satisfy |a_i − i| ≠ K
Revision en1, by elizabeth_zou_fanboi, 2024-11-08 20:02:12
History
Revisions
| 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) |
Codeforces (c) Copyright 2010-2025 Mike Mirzayanov
The only programming contests Web 2.0 platform
Server time: Feb/23/2025 20:13:19 (j2).
Desktop version, switch to mobile version.
Supported by
