i am certain that my approach is fine just can’t figure out what’s wrong plz help
Even I had the same problem…
Try this test case :
5 4 3 3 2
1 2 3 4 2
your code gives 4…expected is 3…as we need to count unique colors on wall (even if they are in different partition)
Just add a set to get correct answer…
ohh! okay thank u so much!!