包括质数，约数，欧拉函数，快速幂，扩展欧几里得算法，中国剩余定理，高斯消元，求组合数，容斥原理，博弈论等内容。
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Section 7. 高斯消元
Open
| Problem | Tried | AC | Difficulty |
|---|---|---|---|
| AcWing883 高斯消元解线性方程组 | 1 | 1 | 10 |
| AcWing884 高斯消元解异或线性方程组 | 1 | 1 | 10 |
Section 8. 求组合数
Open
| Problem | Tried | AC | Difficulty |
|---|---|---|---|
| AcWing885 求组合数 I | 0 | 0 | (None) |
| AcWing886 求组合数 II | 0 | 0 | (None) |
| AcWing887 求组合数 III | 0 | 0 | (None) |
| AcWing888 求组合数 IV | 0 | 0 | (None) |
| AcWing889 满足条件的01序列 | 0 | 0 | (None) |
Section 10. 博弈论
Open
| Problem | Tried | AC | Difficulty |
|---|---|---|---|
| AcWing891 Nim游戏 | 1 | 0 | 10 |
| AcWing892 台阶-Nim游戏 | 0 | 0 | (None) |
| AcWing893 集合-Nim游戏 | 0 | 0 | (None) |
| AcWing894 拆分-Nim游戏 | 0 | 0 | (None) |
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