Why the answer is 16 but not 8 in Example 1? I can only figure out the 8 strings below
- B AAAAAAA ABBABAB
- B AAAAAAA ABBABBA
- B AAAAAAA ABABBAB
- B AAAAAAA ABABBBA
- B ABBABAB AAAAAAA
- B ABBABBA AAAAAAA
- B ABABBAB AAAAAAA
- B ABABBBA AAAAAAA
→ Pay attention
→ Streams
→ Top rated
| # | User | Rating |
|---|---|---|
| 1 | tourist | 3985 |
| 2 | jiangly | 3814 |
| 3 | jqdai0815 | 3682 |
| 4 | Benq | 3529 |
| 5 | orzdevinwang | 3526 |
| 6 | ksun48 | 3517 |
| 7 | Radewoosh | 3410 |
| 8 | hos.lyric | 3399 |
| 9 | ecnerwala | 3392 |
| 9 | Um_nik | 3392 |
→ Top contributors
| # | User | Contrib. |
|---|---|---|
| 1 | cry | 169 |
| 2 | maomao90 | 162 |
| 2 | Um_nik | 162 |
| 4 | atcoder_official | 161 |
| 5 | djm03178 | 158 |
| 6 | -is-this-fft- | 157 |
| 7 | adamant | 155 |
| 8 | awoo | 154 |
| 8 | Dominater069 | 154 |
| 10 | luogu_official | 150 |
→ Find user
→ Recent actions
Codeforces (c) Copyright 2010-2024 Mike Mirzayanov
The only programming contests Web 2.0 platform
Server time: Dec/23/2024 01:58:45 (i1).
Desktop version, switch to mobile version.
Supported by
I think you misinterpreted $$$s_i$$$ and the input. I recommend reading the definition of $$$s_i$$$ and the input again. "B ABBABAB AAAAAAA" is not a valid constellation. The children of $$$s_1$$$ are $$$s_2$$$ and $$$s_3$$$, not $$$s_2$$$ and $$$s_9$$$.
What could've lead to this confusion: The preorder string of input "BAAAAAAAABBABAB" is not "BAAAAAAAABBABAB".
oh, thank you for explaining it to me, i've been confused about this for hours..