Solve hanging lantern problem: Difference between revisions
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===Directly computing the count=== |
===Directly computing the count=== |
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Compute the count directly: |
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<syntaxhighlight lang="ruby" line>Factorial = Hash.new{|h, k| h[k] = k * h[k-1] } # a memoized factorial |
<syntaxhighlight lang="ruby" line>Factorial = Hash.new{|h, k| h[k] = k * h[k-1] } # a memoized factorial |
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Factorial[0] = 1 |
Factorial[0] = 1 |
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