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[sonjh1217] WEEK05 solutions #1837

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Merged
merged 2 commits into from
Aug 24, 2025
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[sonjh1217] WEEK05 solutions #1837

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best time to buy and sell stock
sonjh1217 Aug 18, 2025
c1b622b
group anagrams
sonjh1217 Aug 22, 2025
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18 changes: 18 additions & 0 deletions group-anagrams/sonjh1217.swift
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Original file line number Diff line number Diff line change
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class Solution {
func groupAnagrams(_ strs: [String]) -> [[String]] {
var stringsByCount = [[Int]: [String]]()

strs.map { str in
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map을 사용하셨는데, 반환값을 사용하지 않는 경우라면 forEach를 쓰면 의도가 더 잘 드러날 것 같습니다. 🙂

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@sonjh1217 sonjh1217 Aug 24, 2025 •
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그렇네요!! 사실 for loop만 많이 쓰다가 될수록 higher-order function을 써보려고 하고 있는데 초보 티가 났네용ㅎㅎ 감사합니다. 다음주 풀리에 반영해서 올릴게요~!

var countsByAlphabet = Array(repeating: 0, count: 26)
for char in str.unicodeScalars {
countsByAlphabet[Int(char.value) - 97] += 1
}
stringsByCount[countsByAlphabet, default: []].append(str)
}

return Array(stringsByCount.values)
}
//시간 O(n*L) L=string들의 평균 길이
//공간 O(n*L)
}