how to solve this problem ?1265B - Beautiful Numbers

here is my submission in python 82612211

ok sorry for the joke if you don't find it funny.

but seriously i am not able to understand the idea of the editorial. please help me in this problem.

Please, try EDU on Codeforces! New educational section with videos, subtitles, texts, and problems.
×

# | User | Rating |
---|---|---|

1 | MiFaFaOvO | 3681 |

2 | tourist | 3567 |

3 | Um_nik | 3527 |

4 | ecnerwala | 3458 |

5 | maroonrk | 3409 |

6 | 300iq | 3317 |

7 | Petr | 3272 |

8 | LHiC | 3229 |

9 | Benq | 3226 |

10 | TLE | 3223 |

# | User | Contrib. |
---|---|---|

1 | Errichto | 198 |

2 | antontrygubO_o | 188 |

3 | pikmike | 183 |

4 | Ashishgup | 182 |

5 | vovuh | 179 |

6 | Radewoosh | 167 |

7 | Um_nik | 164 |

8 | tourist | 163 |

9 | McDic | 162 |

10 | Monogon | 159 |

how to solve this problem ?1265B - Beautiful Numbers

here is my submission in python 82612211

ok sorry for the joke if you don't find it funny.

but seriously i am not able to understand the idea of the editorial. please help me in this problem.

↑

↓

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Jul/03/2020 17:41:28 (g2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|

Auto comment: topic has been updated by bohot_hard_123 (previous revision, new revision, compare).This is how I solved this problem: I was iterating from 1 to n. Let l is the leftmost position of all number from 1 to i, and r — the rightmost one. Then i is a good number if and only if (r — l + 1) == i. Do you need a proof of that?

sorry i doesn't understand can you elaborate more deeply.

looks like you are using same formula which is describe in editorial.

and also thanks for the replying on my blog