Unverified Commit a9b1de6a authored by Shuhao Zhang's avatar Shuhao Zhang Committed by GitHub
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add problems

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(建议学习[位运算](/math/bit/)部分的内容)

### 状压 DP 简介
## 状压 DP 简介

状压 dp 是动态规划的一种,借由将状态压缩(通常压缩为某整形)以达到节约空间和时间的目的

#### 常用格式
### 常用格式

```cpp
int maxn = 1 << n;  //规定状态的上界
@@ -26,7 +26,7 @@ for (int i = 2; i <= 层数(dp上界); i++) {
for (int i = 1; i <= top; i++) ans += dp[上界][Type[i]];
```

#### 典型例题
### 典型例题

[\[USACO06NOV\]玉米田 Corn Fields](https://www.luogu.org/problemnew/show/P1879)

@@ -37,3 +37,13 @@ for (int i = 1; i <= top; i++) ans += dp[上界][Type[i]];
具体实现方法同上方伪代码

[例题代码](https://www.luogu.org/paste/kto3ua68)

### 几道练习题

[NOI2001 炮兵阵地](https://www.luogu.org/problemnew/show/P2704)

[SCOI2005 互不侵犯](https://www.luogu.org/problemnew/show/P1896)

[AHOI2009 中国象棋](https://www.luogu.org/problemnew/show/P2051)

[九省联考2018 一双木棋](https://www.luogu.org/problemnew/show/P4363)