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Challenges

Comments on Cumulative Counts

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Cumulative Counts

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Challenge

Given an array of numbers return the cumulative count of each item.

This is the number of times an item has occurred so far.

Examples

[1,1,2,2,2,1,1,1,3,3] -> [1,2,1,2,3,3,4,5,1,2]
[3,7,5,4,9,2,3,2,6,6] -> [1,1,1,1,1,1,2,2,1,2]

Brownie points for beating my 7 byte APL answer.

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APL (Dyalog Unicode), 11 7 bytes (SBCS)

Razetime and rak1507 came up with 7 byte equivalents of my original dfn (this one's rak1507's). See their solutions below.

+/¨⊢=,\

Try it online!

+/¨⊢=,\
     ,\ ⍝ Prefixes of the list
    =   ⍝ Compare every prefix
   ⊢   ⍝ to the corresponding element in the original list
+/     ⍝ Sum each to get a count of how many elements in each prefix match
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General comments (3 comments)
General comments
rak1507‭ wrote over 3 years ago

(this as a train is my 7 byte solution)

Razetime‭ wrote over 3 years ago

1⊥¨⊢=,\ here you go

rak1507‭ wrote over 3 years ago

or +/¨⊢=,/ or my personal favourite ⊢+.=¨,\