Case: Silhouette
Clue of
Examples
Case 1
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Explanation
A -clue means we can only see 1 skyscraper. The only way to achieve this is if we see the tallest skyscraper (the -skyscraper) first, obscuring all the rest behind it.
If we picked any other skyscraper as our 1 visible skyscraper, we’d still be able to see the -skyscraper behind it as well, since the -skyscraper is taller than all other skyscrapers.
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If we don‘t place the in the head cell, then we‘ll be able to see more than 1 skyscraper, since all other skyscrapers are shorter than .