15 lines
144 B
APL
15 lines
144 B
APL
freq←{(⍪∪⍵),+/(∪⍵)∘.⍷⍵}
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freq 0 1 2 3 2 3 4 3 4 4 4
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0 1
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1 1
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2 2
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3 3
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4 4
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freq 'balloon'
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b 1
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a 1
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l 2
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o 2
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n 1
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