# 构造

## 例题¶

### 例题 1¶

Codeforces Round #384 (Div. 2) C.Vladik and fractions

### 例题 2¶

Luogu P3599 Koishi Loves Construction

Taks2：试判断能否构造并构造一个长度为的排列，满足其个前缀积在模的意义下互不相同

### 例题 3¶

AtCoder Grand Contest 032 B

You are given an integer . Build an undirected graph with vertices with indices to that satisfies the following two conditions:

• The graph is simple and connected.
• There exists an integer such that, for every vertex, the sum of the indices of the vertices adjacent to that vertex is .

It can be proved that at least one such graph exists under the constraints of this problem.

### 例题 4¶

BZOJ 4971「Lydsy1708 月赛」记忆中的背包