Problem Name | Online Judge | Contest | Difficulty Level | |
---|---|---|---|---|

1 | LUCIFER Number | SPOJ | 2 | |

2 | G-One Numbers | SPOJ | 2 | |

3 | Ra-One Numbers | SPOJ | 2 | |

4 | Magic Numbers | Codeforces | Educational Codeforces Round 8 | 6 |

5 | Salazar Slytherin's Locket | Codeforces | Manthan, Codefest 17 | 7 |

6 | Igor and Interesting Numbers | Codeforces | Codeforces Round #387 (Div. 2) | 9 |