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๐Ÿงฒ python Algorithm

๐Ÿ” programmers ์•ฝ์ˆ˜์˜๊ฐœ์ˆ˜์™€๋ง์…ˆ ์ฝ”๋“œ์ฑŒ๋ฆฐ์ง€ ์‹œ์ฆŒ2 ์‰ฌ์šด ๋ฌธ์ œ์ด๋‹ค. ์ฝ”๋“œ๋ฅผ ์ด์˜๊ฒŒ ์ž˜ ์ค„์ธ๊ฒƒ ๊ฐ™์•„์„œ ์˜ฌ๋ฆฐ๋‹ค.

  • ํ’€์ด
def fun1(num):
    result = [x for x in range(1, num // 2 + 1) if num % x == 0]
    result.append(num)
    return num if len(result) % 2 == 0 else -num

def solution(left, right):
    return sum([fun1(x) for x in range(left, right + 1)])

๐Ÿงฒ python Algorithm

๐Ÿ” programmers ์™„์ฃผํ•˜์ง€ ๋ชปํ•œ ์„ ์ˆ˜ hash hash ๋ฌธ์ œ์ด๋‹ค.
๋” ์ด์˜๊ฒŒ ํ’€๊ณ  ์‹ถ์—ˆ์ง€๋งŒ sort๋ฅผ ์‚ฌ์šฉํ•˜๊ฒŒ ๋˜๋ฉด hash ๋ฅผ ์‚ฌ์šฉํ•˜์ง€ ์•Š์€๊ฒŒ ๋˜์–ด๋ฒ„๋ ค์„œ ์ผ๋‹จ dict๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ํ’€์—ˆ๋‹ค.
ํ™•์‹ค์ด ์˜›๋‚  ๋ฌธ์ œ๋“ค์ด ๋‚œ์ด๋„๊ฐ€ ๋‚ฎ๋‹ค.
๋‹ค๋ฅธ ์‚ฌ๋žŒ์˜ ํ’€์ด๋ฅผ ๋ณด๋‹ˆ counter ๋ผ๋Š” ๊ฒƒ์„ ์ป๋Š”๋ฐ ์ €๋ฒˆ์— ๋ณด๊ณ  ๊ณต๋ถ€ํ•ด์•ผ์ง€ ํ•˜๊ณ  ์ง€๋‚˜์ณค๋Š”๋ฐ ๊ณต๋ถ€ํ•ด์•ผ๊ฒ ๋‹ค.

from collections import defaultdict

def solution(participant, completion):
    temp = defaultdict(int)
    for pa in participant:
        temp[pa] += 1
    for com in completion:
        temp[com] -= 1
    for key, val in temp.items():
        if val != 0:
            return key

๐Ÿงฒ python collections counter()

๐Ÿ” counter() ํ•จ์ˆ˜๋Š” ๋“ค์–ด์˜จ ์ธ์ž๋“ค์˜ ์ˆ˜๋ฅผ ์„ธ์–ด์ฃผ๋Š” ํ•จ์ˆ˜์ด๋‹ค.
์˜ˆ์‹œ๋ฅผ ๋ณด๋ฉด ๋ฐ”๋กœ ์ดํ•ด๊ฐ€ ๋œ๋‹ค.

from collections import Counter

Counter("hello world")
# {'h': 1, 'e': 1, 'l': 3, 'o': 2, ' ': 1, 'w': 1, 'r': 1, 'd': 1}

์œ„ ๋ฌธ์ œ๋„ counter() ๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด ์—„์ฒญ ์‰ฝ๊ฒŒ ํ’€ ์ˆ˜ ์žˆ๋‹ค.

from collections import Counter

def solution(participant, completion):
    result = Counter(participant) - Counter(completion)
    return list(result.keys())[0]

์ž˜ ๊ธฐ์–ตํ•ด ๋‘๊ณ  ์ž˜ ์จ๋จน์ž!

๐Ÿงฒ ์žก๋‹ด

๐Ÿ” django ์‹ฌํ™” ๊ณผ์ • ๊ฐ•์˜๋ฅผ ๋“ฃ๊ณ  ์žˆ๋Š”๋ฐ ์—ญ์‹œ ๊ธฐ์ดˆ๋ณด๋‹ค๋Š” ์‹ฌํ™”๊ฐ€ ์žฌ๋ฐŒ๋‹ค.
์•„์ง์€ ์ต์ˆ™ํ•˜์ง€๋Š” ์•Š์ง€๋งŒ ๊ธˆ๋ฐฉ ์ต์ˆ™ํ•ด ์งˆ ๊ฒƒ ๊ฐ™๋‹ค. ์ฃผ๋ง์— ์นœ๊ตฌ๋“ค๊ณผ ๊ณต์„ ์ฐจ๋Š”๋ฐ ๊ตฌ์žฅ์„ ์žก๊ณ  ์˜ˆ์•ฝํ•˜๊ณ , ์นœ๊ตฌ๋“ค ํšŒ๋น„๋ฅผ ๊ฑท๋Š” ์ผ์„ ๋งก์€ ์นœ๊ตฌ๊ฐ€ ์žˆ๋‹ค.
์ €๋ฒˆ์— ํ•˜์ง€ ๋ชปํ–ˆ๋˜ ๊ณ„์ขŒ ์—ฐ๋™์„ ํ•˜์—ฌ ํšŒ๋น„ ๊ด€๋ฆฌ ์‚ฌ์ดํŠธ๋ฅผ ๊ฐ„๋‹จํ•˜๊ฒŒ ๋งŒ๋“ค์–ด๋ด์•ผ๊ฒ ๋‹ค.
๋งŒ๋“ค์–ด๋ณด๊ณ  ์‹ถ์€๊ฒŒ ๋„ˆ๋ฌด ๋งŽ๋‹ค. ์›น ํฌ๋กค๋งํ•ด์„œ ๊ด€์‹ฌ์žˆ๋Š” ๊ธฐ์—…์˜ ๊ด€์‹ฌ์žˆ๋Š” ํฌ์ง€์…˜ ๊ณต๊ณ ๊ฐ€ ์˜ฌ๋ผ์˜ค๋ฉด ๋ฉ”์ผ์„ ๋ณด๋‚ด์ฃผ๋Š” ํŒŒ์ผ์„ ๋งŒ๋“ค์–ด๋ณด๊ณ  ์žˆ๋Š”๋ฐ ์ž๋™ํ™”๊ฐ€ ์—ญ์‹œ ์žฌ๋ฐŒ๋‹ค ใ…Žใ…Ž

๋„ˆ๋ฌด ์ด๊ฒƒ์ €๊ฒƒ ๋งŒ๋“ค๊ณ  ๊ณต๋ถ€ํ•˜๋‹ค ๋ณด๋‹ˆ ์ง„ํ–‰์ด ๋น ๋ฅด๊ฒŒ ๋˜์ง€ ์•Š๋Š”๊ฑด ์žˆ๋Š”๋ฐ ์–ด์ฉŒ๊ฒ ๋‚˜, ๋‹ค ํ•ด๋ณด๊ณ ์‹ถ์€๋ฐ.. ใ…Ž

๊ทธ์ œ? ์•ˆํ’€๋ฆฌ๋˜ ๋ฌธ์ œ ๊ฑฐ์˜ ๋‹ค ํ’€์—ˆ๋Š”๋ฐ ์ฃผ๋ง์— ๋งˆ๋ฌด๋ฆฌ ํ•ด์„œ ์˜ฌ๋ ค์•ผ๊ฒ ๋‹ค.

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