【ECJTU_ACM 11级队员2012年暑假训练赛（8） - C - Asteroids】

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原文链接：http://www.cnblogs.com/ismdeep/archive/2012/08/13/2635969.html

在NxN网格的危险小行星区域中，Bessie必须使用她强大的武器清除所有的小行星。通过消除同一行或列的所有小行星来最小化射击次数。

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B题要套一个数论的模版，注意m=1！！ C题可以二分匹配，把行列看作点; 不能开百度，开谷歌搜题解，再次强调！一经发现，取消成绩！

ECJTU_ACM 11级队员2012年暑假训练赛（8）

4:30:00

A B C D E F G H I J K

C - Asteroids

Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%I64d & %I64u

Submit Status Practice POJ 3041

Description

Bessie wants to navigate her spaceship through a dangerous asteroid field in the shape of an N x N grid (1 <= N <= 500). The grid contains K asteroids (1 <= K <= 10,000), which are conveniently located at the lattice points of the grid.

Fortunately, Bessie has a powerful weapon that can vaporize all the asteroids in any given row or column of the grid with a single shot.This weapon is quite expensive, so she wishes to use it sparingly.Given the location of all the asteroids in the field, find the minimum number of shots Bessie needs to fire to eliminate all of the asteroids.

Input

* Line 1: Two integers N and K, separated by a single space.
* Lines 2..K+1: Each line contains two space-separated integers R and C (1 <= R, C <= N) denoting the row and column coordinates of an asteroid, respectively.

Output

* Line 1: The integer representing the minimum number of times Bessie must shoot.

Sample Input

Sample Output

Hint

INPUT DETAILS:
The following diagram represents the data, where "X" is an asteroid and "." is empty space:
X.X .X. .X.

OUTPUT DETAILS:
Bessie may fire across row 1 to destroy the asteroids at (1,1) and (1,3), and then she may fire down column 2 to destroy the asteroids at (2,2) and (3,2).

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转载于:https://www.cnblogs.com/ismdeep/archive/2012/08/13/2635969.html