This problem is related to the 17x17 challenge. Given a matrix filled with ones and zeros, determine whether or not any rectangles are present. A rectangle is a formed whenever four ones appear in the corners of a rectangular region of the matrix.
Examples:
Input a = [ 1 0 0 0 0
0 0 0 1 0
0 0 0 0 1
0 0 0 0 1
0 0 1 0 0 ]
Output tf is false
You can't form any rectangles here.
Input a = [ 1 0 1 0
0 0 1 0
1 0 1 0
0 0 1 1 ]
Output tf is true
There is a rectangle: a([1 3],[1 3]) is [1 1; 1 1]
Solution Stats
Problem Comments
4 Comments
Solution Comments
Show comments
Loading...
Problem Recent Solvers180
Suggested Problems
-
246 Solvers
-
520 Solvers
-
Create a vector whose elements depend on the previous element
800 Solvers
-
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
2118 Solvers
-
617 Solvers
More from this Author54
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
test cases imply that the question title should be "spot the square"
I added a rectangular (non-square) test case. Thanks for the note.
Could you add
a = ones(3) - eye(3)
to the test suite?
It was a good problem.
If anyone find it's difficult , you can download my answer
http://up-4.net/d/tt5L