This problem is related to the 17x17 challenge. See also Part 1 of this problem. Given a matrix in which each element is either 1, 2, 3, or 4, determine whether or not any rectangles are present. A rectangle is a formed whenever four instances of the same value appear in the corners of a rectangular region of the matrix.
Examples:
Input a = [ 4 1 2 4 1
3 3 2 1 4
3 2 4 1 1
1 4 3 2 2
1 1 1 4 4 ]
Output tf is false
You can't form any rectangles here.
Input a = [ 1 4 3 1
3 1 4 1
1 3 4 1
1 1 2 3 ]
Output tf is true
There is a rectangle: a([1 3],[1 4]) is [1 1; 1 1]
Solution Stats
Problem Comments
1 Comment
Solution Comments
Show comments
Loading...
Problem Recent Solvers145
Suggested Problems
-
Find the longest sequence of 1's in a binary sequence.
6863 Solvers
-
Remove all the words that end with "ain"
2734 Solvers
-
988 Solvers
-
Set some matrix elements to zero
646 Solvers
-
Who is the smartest MATLAB programmer?
795 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!
it was a good problem.
Here is my m File Solution : http://up-4.net/d/tt7S