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 | ecnerwala | 3648 |
| 2 | Benq | 3580 |
| 3 | orzdevinwang | 3570 |
| 4 | cnnfls_csy | 3569 |
| 5 | Geothermal | 3568 |
| 6 | tourist | 3565 |
| 7 | maroonrk | 3530 |
| 8 | Radewoosh | 3520 |
| 9 | Um_nik | 3481 |
| 10 | jiangly | 3467 |
→ Top contributors
| # | User | Contrib. |
|---|---|---|
| 1 | maomao90 | 174 |
| 2 | adamant | 164 |
| 2 | awoo | 164 |
| 4 | TheScrasse | 160 |
| 5 | nor | 159 |
| 6 | maroonrk | 156 |
| 7 | SecondThread | 150 |
| 8 | -is-this-fft- | 148 |
| 9 | pajenegod | 146 |
| 10 | BledDest | 144 |
→ Find user
→ Recent actions
Codeforces (c) Copyright 2010-2024 Mike Mirzayanov
The only programming contests Web 2.0 platform
Server time: Apr/16/2024 14:14:18 (g1).
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..