## [ACM_HDU_2046]骨牌铺方格

### 骨牌铺方格

Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 14699 Accepted Submission(s): 7085

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## [ACM_ZOJ_1002]Fire Net

### Fire Net

Time Limit: 2 Seconds      Memory Limit: 65536 KB

Suppose that we have a square city with straight streets. A map of a city is a square board with n rows and n columns, each representing a street or a piece of wall.

A blockhouse is a small castle that has four openings through which to shoot. The four openings are facing North, East, South, and West, respectively. There will be one machine gun shooting through each opening.

Here we assume that a bullet is so powerful that it can run across any distance and destroy a blockhouse on its way. On the other hand, a wall is so strongly built that can stop the bullets.

The goal is to place as

many

blockhouses in a city as possible so that no two can destroy each other. A configuration of blockhouses is legal provided that no two blockhouses are on the same horizontal row or vertical column in a map unless there is at least one wall separating them. In this problem we will consider small square cities (at most 4x4) that contain walls through which bullets cannot run through.

The following image shows five pictures of the same board. The first picture is the empty board, the second and third pictures show legal configurations, and the fourth and fifth pictures show illegal configurations. For this board, the maximum number of blockhouses in a legal configuration is 5; the second picture shows one way to do it, but there are several other ways.

Your task is to write a program that, given a description of a map, calculates the maximum number of blockhouses that can be placed in the city in a legal configuration.

The input file contains one or more map descriptions, followed by a line containing the number 0 that signals the end of the file. Each map description begins with a line containing a positive integer

n

that is the size of the city;

n

will be at most 4. The next

n

lines each describe one row of the map, with a '

.

' indicating an open space and an uppercase '

X

' indicating a wall. There are no spaces in the input file.

For each test case, output one line containing the maximum number of blockhouses that can be placed in the city in a legal configuration.

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## [ACM实验三]ACM程序设计基础（1）

1．输入年、月、日，计算该日是该年的第n天，输出n。

2．对于大于等于6的偶数，可以表示为2个素数之和，请判断一个数是否是对称数，如果该数为对称数而且是偶数，输出其和等于该数的2个素数。

3．Fire Net问题， 要求输出最优值和最优值对应的最优解。

4．附加题：0-1背包问题：有N件物品和一个容量为V的背包。第i件物品的体积是c[i]，价值是w[i]。物品（1.可以;2.不可）切割出来只是装一部分，求解将哪些物品装入背包可使这些物品的体积总和不超过背包容量，且价值总和最大，先输入物品数n和背包容量v，然后输入各个物品费用和价值，输出最大价值。

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## [ACM实验二]C++STL泛型编程（2）

#### 实验项目：C++STL泛型编程（2） 实验目的：掌握C++STL string向量容器等的应用。 实验要求：使用VC++6.0实现实验要求。 实验内容：

a 2
d 1
e 1
f 1
s 1

2. 古代一位国王和他的张、王、李、赵、钱五位将军一同出外打猎，各人的箭上都刻有自己的姓氏。打猎中，一只鹿中箭倒下，但不知是何人所射。

3. 输入一个自然数Ｎ（2≤N≤9），要求输出如下的魔方阵，即边长为N行N列，元素取值为1至N*N，1在左上角，呈顺时针方向依次放置各元素。如输入4，输出：
1 2 3 412  13  14   511  16  15   610   9   8   7

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## [ACM实验一]C++STL泛型编程（1）

#### 实验项目：C++STL泛型编程（1） 实验目的：掌握C++STL vector向量容器、stack堆容器和queue队列容器的应用。 实验要求：使用VC++6.0实现实验要求。 实验内容：

1.利用vector向量容器，实现1—n个数围成一圈，隔3输出，输出最后的顺序号。
2.利用stack堆栈容器，实现输入一个算术表达式中包含圆括弧、方括弧和花括弧三种类型的括弧，输出是否正确配对。例如：

3.利用queue队列容器实现杨辉三角，根据输入的n，输出对应的杨辉三角（猛击进入相应OJ题目）。
4.附加题：

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