atcoder#CODEFESTIVAL2017QUALAB. fLIP
fLIP
Score : points
Problem Statement
We have a grid with rows and columns of squares. Initially, all the squares are white.
There is a button attached to each row and each column. When a button attached to a row is pressed, the colors of all the squares in that row are inverted; that is, white squares become black and vice versa. When a button attached to a column is pressed, the colors of all the squares in that column are inverted.
Takahashi can freely press the buttons any number of times. Determine whether he can have exactly black squares in the grid.
Constraints
Input
Input is given from Standard Input in the following format:
Output
If Takahashi can have exactly black squares in the grid, print Yes
; otherwise, print No
.
2 2 2
Yes
Press the buttons in the order of the first row, the first column.
2 2 1
No
3 5 8
Yes
Press the buttons in the order of the first column, third column, second row, fifth column.
7 9 20
No