| # | User | Rating |
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| 1 | tourist | 3985 |
| 2 | jiangly | 3741 |
| 3 | jqdai0815 | 3682 |
| 4 | Benq | 3529 |
| 5 | orzdevinwang | 3526 |
| 6 | ksun48 | 3489 |
| 7 | Radewoosh | 3483 |
| 8 | Kevin114514 | 3442 |
| 9 | ecnerwala | 3392 |
| 9 | Um_nik | 3392 |
| # | User | Contrib. |
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| 1 | cry | 169 |
| 2 | atcoder_official | 162 |
| 2 | maomao90 | 162 |
| 2 | Um_nik | 162 |
| 5 | djm03178 | 158 |
| 6 | -is-this-fft- | 157 |
| 7 | adamant | 155 |
| 8 | awoo | 154 |
| 8 | Dominater069 | 154 |
| 10 | nor | 150 |
Please Help in following problem.
please help me in following problem , i tried to read its analysis ,but was unable to understand its optimised solution . I looked for various people solution ,they had used bfs, but i am unable to interpret that too.
Just give me the way ,through which i should approach this problem .
