编程介的小学生 2017-11-02 13:54 采纳率: 20.5%
浏览 961
已采纳

Flip Game

Problem Description
Flip game is played on a square N*N field with two-sided pieces placed on each of its N^2 squares. One side of each piece is white and the other one is black and each piece is lying either it's black or white side up. The rows are numbered with integers from 1 to N upside down; the columns are numbered with integers from 1 to N from the left to the right. Sequences of commands (xi, yi) are given from input, which means that both pieces in row xi and pieces in column yi will be flipped (Note that piece (xi, yi) will be flipped twice here). Can you tell me how many white pieces after sequences of commands?
Consider the following 4*4 field as an example:

bwww
wbww
wwbw
wwwb

Here "b" denotes pieces lying their black side up and "w" denotes pieces lying their white side up.
Two commands are given in order: (1, 1), (4, 4). Then we can get the final 4*4 field as follows:

bbbw
bbwb
bwbb
wbbb

So the answer is 4 as there are 4 white pieces in the final field.

Input
The first line contains a positive integer T, indicating the number of test cases (1 <= T <= 20).
For each case, the first line contains a positive integer N, indicating the size of field; The following N lines contain N characters each which represent the initial field. The following line contain an integer Q, indicating the number of commands; each of the following Q lines contains two integer (xi, yi), represent a command (1 <= N <= 1000, 0 <= Q <= 100000, 1 <= xi, yi <= N).

Output
For each case, please print the case number (beginning with 1) and the number of white pieces after sequences of commands.

Sample Input
2
4
bwww
wbww
wwbw
wwwb
2
1 1
4 4
4
wwww
wwww
wwww
wwww
1
1 1

Sample Output
Case #1: 4
Case #2: 10

  • 写回答

2条回答 默认 最新

  • threenewbee 2017-11-27 15:51
    关注
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)

报告相同问题?

悬赏问题

  • ¥15 我这模型写的不对吗?为什么lingo解出来的下面影子价格这一溜少一个变量
  • ¥50 树莓派安卓APK系统签名
  • ¥15 maple软件,用solve求反函数出现rootof,怎么办?
  • ¥65 汇编语言除法溢出问题
  • ¥15 Visual Studio问题
  • ¥20 求一个html代码,有偿
  • ¥100 关于使用MATLAB中copularnd函数的问题
  • ¥20 在虚拟机的pycharm上
  • ¥15 jupyterthemes 设置完毕后没有效果
  • ¥15 matlab图像高斯低通滤波