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
-
10807 Solvers
-
How many trades represent all the profit?
619 Solvers
-
Getting the indices from a matrix
733 Solvers
-
Piecewise linear interpolation
636 Solvers
-
Fix the last element of a cell array
1857 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