- Stats
- /
- Class

**Class** is a grade that can be obtained by solving problems curated by solved.ac. If you acquire Class, you can receive up to 250 bonus ratings.

- Reference: Guide
**Tiers and AC Rating**

There are a total of 10 Classes. Each Class has 36-48 problems predetermined by solved.ac. By solving the number of problems corresponding to the **acquisition condition** of each Class, you can acquire that Class.

- To acquire Class 9 and 10, you must acquire the previous Class.

Problems | 36 | 40 | 48 | 48 | 48 |

Acquisition | 16 | 20 | 24 | 24 | 24 |

Bonus Ratings | +25 | +50 | +100 | +150 | +200 |

Problems | 48 | 48 | 48 | 48 | 48 |

Acquisition | 24 | 24 | 24 | 24 | 24 |

Bonus Ratings | +210 | +220 | +230 | +240 | +250 |

**Class 1**: A stage to help beginners in problem solving become familiar with problem solving**Class 2**: A stage where you need to solve problems using basic data structures, algorithms, and computational thinking**Class 3–4**: A stage where you need to solve problems using data structures, algorithms, and computational thinking at the undergraduate level of computer science used in coding tests and the industry**Class 5–6**: A stage where you need to solve problems using various basic knowledge that appears in programming contests**Class 7–10**: A stage where you need to solve problems using advanced knowledge that appears in programming contests

If you meet certain conditions, decorations will be added to the acquired Class.

Decoration | Condition | |
---|---|---|

None | Acquire Class | |

Silver | Solve all Essential problems in the Class | |

Gold | Solve all problems in the Class |

When you acquire a decoration, the Class will be displayed as $x$⁺(Silver) or $x$⁺⁺(Gold) instead of $x$ on ranking pages and some other pages. There are no bonus ratings.

Among the problems in the Class, problems considered important are called **Essential Problems**. When you solve all Essential Problems, a decoration will be added.