[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค] [1์ฐจ] ๋‰ด์Šค ํด๋Ÿฌ์Šคํ„ฐ๋ง/Python - Lv.2

2025. 10. 2. 17:01ยทCoding Test/Algorithms

โ“๋ฌธ์ œ

https://school.programmers.co.kr/learn/courses/30/lessons/17677

์„ฑ๋Šฅ ์š”์•ฝ

๋ฉ”๋ชจ๋ฆฌ: 9.23 MB, ์‹œ๊ฐ„: 1.39 ms

๊ตฌ๋ถ„

์ฝ”๋”ฉํ…Œ์ŠคํŠธโ€…์—ฐ์Šต > 2018โ€…KAKAOโ€…BLINDโ€…RECRUITMENT

 

๋ฌธ์ œ ์„ค๋ช…

 

์—ฌ๋Ÿฌ ์–ธ๋ก ์‚ฌ์—์„œ ์Ÿ์•„์ง€๋Š” ๋‰ด์Šค, ํŠนํžˆ ์†๋ณด์„ฑ ๋‰ด์Šค๋ฅผ ๋ณด๋ฉด ๋น„์Šท๋น„์Šทํ•œ ์ œ๋ชฉ์˜ ๊ธฐ์‚ฌ๊ฐ€ ๋งŽ์•„ ์ •์ž‘ ํ•„์š”ํ•œ ๊ธฐ์‚ฌ๋ฅผ ์ฐพ๊ธฐ๊ฐ€ ์–ด๋ ต๋‹ค. Daum ๋‰ด์Šค์˜ ๊ฐœ๋ฐœ ์—…๋ฌด๋ฅผ ๋งก๊ฒŒ ๋œ ์‹ ์ž…์‚ฌ์› ํŠœ๋ธŒ๋Š” ์‚ฌ์šฉ์ž๋“ค์ด ํŽธ๋ฆฌํ•˜๊ฒŒ ๋‹ค์–‘ํ•œ ๋‰ด์Šค๋ฅผ ์ฐพ์•„๋ณผ ์ˆ˜ ์žˆ๋„๋ก ๋ฌธ์ œ์ ์„ ๊ฐœ์„ ํ•˜๋Š” ์—…๋ฌด๋ฅผ ๋งก๊ฒŒ ๋˜์—ˆ๋‹ค.

๊ฐœ๋ฐœ์˜ ๋ฐฉํ–ฅ์„ ์žก๊ธฐ ์œ„ํ•ด ํŠœ๋ธŒ๋Š” ์šฐ์„  ์ตœ๊ทผ ํ™”์ œ๊ฐ€ ๋˜๊ณ  ์žˆ๋Š” "์นด์นด์˜ค ์‹ ์ž… ๊ฐœ๋ฐœ์ž ๊ณต์ฑ„" ๊ด€๋ จ ๊ธฐ์‚ฌ๋ฅผ ๊ฒ€์ƒ‰ํ•ด๋ณด์•˜๋‹ค.

  • ์นด์นด์˜ค ์ฒซ ๊ณต์ฑ„..'๋ธ”๋ผ์ธ๋“œ' ๋ฐฉ์‹ ์ฑ„์šฉ
  • ์นด์นด์˜ค, ํ•ฉ๋ณ‘ ํ›„ ์ฒซ ๊ณต์ฑ„.. ๋ธ”๋ผ์ธ๋“œ ์ „ํ˜•์œผ๋กœ ๊ฐœ๋ฐœ์ž ์ฑ„์šฉ
  • ์นด์นด์˜ค, ๋ธ”๋ผ์ธ๋“œ ์ „ํ˜•์œผ๋กœ ์‹ ์ž… ๊ฐœ๋ฐœ์ž ๊ณต์ฑ„
  • ์นด์นด์˜ค ๊ณต์ฑ„, ์‹ ์ž… ๊ฐœ๋ฐœ์ž ์ฝ”๋”ฉ ๋Šฅ๋ ฅ๋งŒ ๋ณธ๋‹ค
  • ์นด์นด์˜ค, ์‹ ์ž… ๊ณต์ฑ„.. "์ฝ”๋”ฉ ์‹ค๋ ฅ๋งŒ ๋ณธ๋‹ค"
  • ์นด์นด์˜ค "์ฝ”๋”ฉ ๋Šฅ๋ ฅ๋งŒ์œผ๋กœ 2018 ์‹ ์ž… ๊ฐœ๋ฐœ์ž ๋ฝ‘๋Š”๋‹ค"

๊ธฐ์‚ฌ์˜ ์ œ๋ชฉ์„ ๊ธฐ์ค€์œผ๋กœ "๋ธ”๋ผ์ธ๋“œ ์ „ํ˜•"์— ์ฃผ๋ชฉํ•˜๋Š” ๊ธฐ์‚ฌ์™€ "์ฝ”๋”ฉ ํ…Œ์ŠคํŠธ"์— ์ฃผ๋ชฉํ•˜๋Š” ๊ธฐ์‚ฌ๋กœ ๋‚˜๋‰˜๋Š” ๊ฑธ ๋ฐœ๊ฒฌํ–ˆ๋‹ค. ํŠœ๋ธŒ๋Š” ์ด๋“ค์„ ๊ฐ๊ฐ ๋ฌถ์–ด์„œ ๋ณด์—ฌ์ฃผ๋ฉด ์นด์นด์˜ค ๊ณต์ฑ„ ๊ด€๋ จ ๊ธฐ์‚ฌ๋ฅผ ์ฐพ์•„๋ณด๋Š” ์‚ฌ์šฉ์ž์—๊ฒŒ ์œ ์šฉํ•  ๋“ฏ์‹ถ์—ˆ๋‹ค.

์œ ์‚ฌํ•œ ๊ธฐ์‚ฌ๋ฅผ ๋ฌถ๋Š” ๊ธฐ์ค€์„ ์ •ํ•˜๊ธฐ ์œ„ํ•ด์„œ ๋…ผ๋ฌธ๊ณผ ์ž๋ฃŒ๋ฅผ ์กฐ์‚ฌํ•˜๋˜ ํŠœ๋ธŒ๋Š” "์ž์นด๋“œ ์œ ์‚ฌ๋„"๋ผ๋Š” ๋ฐฉ๋ฒ•์„ ์ฐพ์•„๋ƒˆ๋‹ค.

์ž์นด๋“œ ์œ ์‚ฌ๋„๋Š” ์ง‘ํ•ฉ ๊ฐ„์˜ ์œ ์‚ฌ๋„๋ฅผ ๊ฒ€์‚ฌํ•˜๋Š” ์—ฌ๋Ÿฌ ๋ฐฉ๋ฒ• ์ค‘์˜ ํ•˜๋‚˜๋กœ ์•Œ๋ ค์ ธ ์žˆ๋‹ค. ๋‘ ์ง‘ํ•ฉ A, B ์‚ฌ์ด์˜ ์ž์นด๋“œ ์œ ์‚ฌ๋„ J(A, B)๋Š” ๋‘ ์ง‘ํ•ฉ์˜ ๊ต์ง‘ํ•ฉ ํฌ๊ธฐ๋ฅผ ๋‘ ์ง‘ํ•ฉ์˜ ํ•ฉ์ง‘ํ•ฉ ํฌ๊ธฐ๋กœ ๋‚˜๋ˆˆ ๊ฐ’์œผ๋กœ ์ •์˜๋œ๋‹ค.

์˜ˆ๋ฅผ ๋“ค์–ด ์ง‘ํ•ฉ A = {1, 2, 3}, ์ง‘ํ•ฉ B = {2, 3, 4}๋ผ๊ณ  ํ•  ๋•Œ, ๊ต์ง‘ํ•ฉ A ∩ B = {2, 3}, ํ•ฉ์ง‘ํ•ฉ A ∪ B = {1, 2, 3, 4}์ด ๋˜๋ฏ€๋กœ, ์ง‘ํ•ฉ A, B ์‚ฌ์ด์˜ ์ž์นด๋“œ ์œ ์‚ฌ๋„ J(A, B) = 2/4 = 0.5๊ฐ€ ๋œ๋‹ค. ์ง‘ํ•ฉ A์™€ ์ง‘ํ•ฉ B๊ฐ€ ๋ชจ๋‘ ๊ณต์ง‘ํ•ฉ์ผ ๊ฒฝ์šฐ์—๋Š” ๋‚˜๋ˆ—์…ˆ์ด ์ •์˜๋˜์ง€ ์•Š์œผ๋‹ˆ ๋”ฐ๋กœ J(A, B) = 1๋กœ ์ •์˜ํ•œ๋‹ค.

์ž์นด๋“œ ์œ ์‚ฌ๋„๋Š” ์›์†Œ์˜ ์ค‘๋ณต์„ ํ—ˆ์šฉํ•˜๋Š” ๋‹ค์ค‘์ง‘ํ•ฉ์— ๋Œ€ํ•ด์„œ ํ™•์žฅํ•  ์ˆ˜ ์žˆ๋‹ค. ๋‹ค์ค‘์ง‘ํ•ฉ A๋Š” ์›์†Œ "1"์„ 3๊ฐœ ๊ฐ€์ง€๊ณ  ์žˆ๊ณ , ๋‹ค์ค‘์ง‘ํ•ฉ B๋Š” ์›์†Œ "1"์„ 5๊ฐœ ๊ฐ€์ง€๊ณ  ์žˆ๋‹ค๊ณ  ํ•˜์ž. ์ด ๋‹ค์ค‘์ง‘ํ•ฉ์˜ ๊ต์ง‘ํ•ฉ A ∩ B๋Š” ์›์†Œ "1"์„ min(3, 5)์ธ 3๊ฐœ, ํ•ฉ์ง‘ํ•ฉ A ∪ B๋Š” ์›์†Œ "1"์„ max(3, 5)์ธ 5๊ฐœ ๊ฐ€์ง€๊ฒŒ ๋œ๋‹ค. ๋‹ค์ค‘์ง‘ํ•ฉ A = {1, 1, 2, 2, 3}, ๋‹ค์ค‘์ง‘ํ•ฉ B = {1, 2, 2, 4, 5}๋ผ๊ณ  ํ•˜๋ฉด, ๊ต์ง‘ํ•ฉ A ∩ B = {1, 2, 2}, ํ•ฉ์ง‘ํ•ฉ A ∪ B = {1, 1, 2, 2, 3, 4, 5}๊ฐ€ ๋˜๋ฏ€๋กœ, ์ž์นด๋“œ ์œ ์‚ฌ๋„ J(A, B) = 3/7, ์•ฝ 0.42๊ฐ€ ๋œ๋‹ค.

์ด๋ฅผ ์ด์šฉํ•˜์—ฌ ๋ฌธ์ž์—ด ์‚ฌ์ด์˜ ์œ ์‚ฌ๋„๋ฅผ ๊ณ„์‚ฐํ•˜๋Š”๋ฐ ์ด์šฉํ•  ์ˆ˜ ์žˆ๋‹ค. ๋ฌธ์ž์—ด "FRANCE"์™€ "FRENCH"๊ฐ€ ์ฃผ์–ด์กŒ์„ ๋•Œ, ์ด๋ฅผ ๋‘ ๊ธ€์ž์”ฉ ๋Š์–ด์„œ ๋‹ค์ค‘์ง‘ํ•ฉ์„ ๋งŒ๋“ค ์ˆ˜ ์žˆ๋‹ค. ๊ฐ๊ฐ {FR, RA, AN, NC, CE}, {FR, RE, EN, NC, CH}๊ฐ€ ๋˜๋ฉฐ, ๊ต์ง‘ํ•ฉ์€ {FR, NC}, ํ•ฉ์ง‘ํ•ฉ์€ {FR, RA, AN, NC, CE, RE, EN, CH}๊ฐ€ ๋˜๋ฏ€๋กœ, ๋‘ ๋ฌธ์ž์—ด ์‚ฌ์ด์˜ ์ž์นด๋“œ ์œ ์‚ฌ๋„ J("FRANCE", "FRENCH") = 2/8 = 0.25๊ฐ€ ๋œ๋‹ค.

์ž…๋ ฅ ํ˜•์‹

  • ์ž…๋ ฅ์œผ๋กœ๋Š” str1๊ณผ str2์˜ ๋‘ ๋ฌธ์ž์—ด์ด ๋“ค์–ด์˜จ๋‹ค. ๊ฐ ๋ฌธ์ž์—ด์˜ ๊ธธ์ด๋Š” 2 ์ด์ƒ, 1,000 ์ดํ•˜์ด๋‹ค.
  • ์ž…๋ ฅ์œผ๋กœ ๋“ค์–ด์˜จ ๋ฌธ์ž์—ด์€ ๋‘ ๊ธ€์ž์”ฉ ๋Š์–ด์„œ ๋‹ค์ค‘์ง‘ํ•ฉ์˜ ์›์†Œ๋กœ ๋งŒ๋“ ๋‹ค. ์ด๋•Œ ์˜๋ฌธ์ž๋กœ ๋œ ๊ธ€์ž ์Œ๋งŒ ์œ ํšจํ•˜๊ณ , ๊ธฐํƒ€ ๊ณต๋ฐฑ์ด๋‚˜ ์ˆซ์ž, ํŠน์ˆ˜ ๋ฌธ์ž๊ฐ€ ๋“ค์–ด์žˆ๋Š” ๊ฒฝ์šฐ๋Š” ๊ทธ ๊ธ€์ž ์Œ์„ ๋ฒ„๋ฆฐ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด "ab+"๊ฐ€ ์ž…๋ ฅ์œผ๋กœ ๋“ค์–ด์˜ค๋ฉด, "ab"๋งŒ ๋‹ค์ค‘์ง‘ํ•ฉ์˜ ์›์†Œ๋กœ ์‚ผ๊ณ , "b+"๋Š” ๋ฒ„๋ฆฐ๋‹ค.
  • ๋‹ค์ค‘์ง‘ํ•ฉ ์›์†Œ ์‚ฌ์ด๋ฅผ ๋น„๊ตํ•  ๋•Œ, ๋Œ€๋ฌธ์ž์™€ ์†Œ๋ฌธ์ž์˜ ์ฐจ์ด๋Š” ๋ฌด์‹œํ•œ๋‹ค. "AB"์™€ "Ab", "ab"๋Š” ๊ฐ™์€ ์›์†Œ๋กœ ์ทจ๊ธ‰ํ•œ๋‹ค.

์ถœ๋ ฅ ํ˜•์‹

์ž…๋ ฅ์œผ๋กœ ๋“ค์–ด์˜จ ๋‘ ๋ฌธ์ž์—ด์˜ ์ž์นด๋“œ ์œ ์‚ฌ๋„๋ฅผ ์ถœ๋ ฅํ•œ๋‹ค. ์œ ์‚ฌ๋„ ๊ฐ’์€ 0์—์„œ 1 ์‚ฌ์ด์˜ ์‹ค์ˆ˜์ด๋ฏ€๋กœ, ์ด๋ฅผ ๋‹ค๋ฃจ๊ธฐ ์‰ฝ๋„๋ก 65536์„ ๊ณฑํ•œ ํ›„์— ์†Œ์ˆ˜์  ์•„๋ž˜๋ฅผ ๋ฒ„๋ฆฌ๊ณ  ์ •์ˆ˜๋ถ€๋งŒ ์ถœ๋ ฅํ•œ๋‹ค.

์˜ˆ์ œ ์ž…์ถœ๋ ฅ

str1 str2 answer
FRANCE french 16384
handshake shake hands 65536
aa1+aa2 AAAA12 43690
E=M*C^2 e=m*c^2 65536

โœ๐Ÿปํ’€์ด

๋ฌธ์ œ์—์„œ ๋ฌธ์ž์—ด์„ ๋‘๊ธ€์ž์”ฉ ๋Š์–ด์„œ ๋‹ค์ค‘์ง‘ํ•ฉ ์›์†Œ๋กœ ๋งŒ๋“ ๋‹ค๊ณ  ํ•˜์—ฌ ์šฐ์„  _str1๊ณผ _str2๋กœ ๋‹ค์ค‘์ง‘ํ•ฉ ์›์†Œ๋ฅผ ๋งŒ๋“ ๋‹ค. ์ด๋•Œ ์ˆซ์ž, ํŠน์ˆ˜๊ธฐํ˜ธ, ๊ณต๋ฐฑ๊ณผ ๊ฐ™์ด ๋ฌถ์ธ ๋ฌธ์ž๋Š” ์ œ์™ธํ•˜๋ฏ€๋กœ isalpha()๋ฅผ ์‚ฌ์šฉํ•ด ์•ŒํŒŒ๋ฒณ์œผ๋กœ๋งŒ ๊ตฌ์„ฑ๋œ ์›์†Œ๋กœ ๋‹ค์ค‘์ง‘ํ•ฉ ์›์†Œ๋ฅผ ๋งŒ๋“ ๋‹ค.

์—ฌ๊ธฐ์„œ ๋‹ค์ค‘์ง‘ํ•ฉ ์›์†Œ๋ฅผ ๋งŒ๋“  ํ›„ ํ™•์ธํ–ˆ์„ ๋•Œ ๋‘ ์ง‘ํ•ฉ ๋ชจ๋‘ ๊ณต์ง‘ํ•ฉ์ด๋ผ๋ฉด J(A, B) = 1๋กœ ๋ฐ”๋กœ return 65536์„ ํ•˜๋ฉด ๋œ๋‹ค.

๊ทธ๋ฆฌ๊ณ  ์ด์ œ ๋‚˜๋จธ์ง€ ๊ฒฝ์šฐ๋Š” ๊ต์ง‘ํ•ฉ๊ณผ ํ•ฉ์ง‘ํ•ฉ์„ ๊ตฌํ•ด์„œ ํ•˜๋ฉด ๋œ๋‹ค. Counter๋ฅผ ์ด์šฉํ•ด ๊ต์ง‘ํ•ฉ๊ณผ ํ•ฉ์ง‘ํ•ฉ์„ ๋งŒ๋“œ๋Š” ๋ฐฉ๋ฒ•์ด ์ œ์ผ ๊ฐ„๋‹จํ•˜๊ธด ํ•˜์ง€๋งŒ ๋‚˜๋Š” ๊ต์ง‘ํ•ฉ์„ ์ง์ ‘ ๊ณ„์‚ฐํ•˜์˜€์œผ๋ฏ€๋กœ ์ด์— ๋Œ€ํ•œ ํ’€์ด๋ฅผ ํ•˜๊ฒ ๋‹ค.

ํ•ฉ์ง‘ํ•ฉ์˜ ๊ฒฝ์šฐ ๊ณ ๋“ฑํ•™๊ต ํ™•ํ†ต ๋•Œ ๋ฐฐ์› ๋˜ ๋‘ ์ง‘ํ•ฉ์˜ ํ•ฉ์€ ๊ฐ ์ง‘ํ•ฉ์˜ ํ•ฉ์—์„œ ๊ต์ง‘ํ•ฉ์„ ๋บ€ ๊ฒƒ๊ณผ ๊ฐ™๋‹ค๋Š” ์›๋ฆฌ๋ฅผ ์ด์šฉํ•ด์„œ ๊ณ„์‚ฐํ•œ๋‹ค. ๊ทธ๋Ÿฌ๋ฏ€๋กœ ๊ต์ง‘ํ•ฉ๋งŒ ๊ตฌํ•˜๋ฉด ๋œ๋‹ค. ๊ต์ง‘ํ•ฉ์€ ๋‘ ์ง‘ํ•ฉ์„ ๋น„๊ตํ•ด์„œ ์žˆ๋‹ค๋ฉด _str์—์„œ ์ œ๊ฑฐํ•˜๊ณ  ๊ต์ง‘ํ•ฉ ์›์†Œ๋งŒ ๋‹ด๋Š” ๋ฆฌ์ŠคํŠธ์— ์ถ”๊ฐ€ํ•˜๋ฉด ๋œ๋‹ค. ๊ทธ๋ฆฌ๊ณ  ๊ต์ง‘ํ•ฉ์˜ ์›์†Œ์˜ ๊ฐœ์ˆ˜๋ฅผ ๋‘ ์ง‘ํ•ฉ์˜ ์›์†Œ์˜ ๊ฐœ์ˆ˜ ํ•ฉ์—์„œ ๋นผ๋ฉด ํ•ฉ์ง‘ํ•ฉ์˜ ์›์†Œ์˜ ๊ฐœ์ˆ˜๊ฐ€ ๋‚˜์˜จ๋‹ค. ๋งˆ์ง€๋ง‰์œผ๋กœ ๊ต์ง‘ํ•ฉ์˜ ์›์†Œ์˜ ๊ฐœ์ˆ˜/ํ•ฉ์žกํ•ฉ์˜ ์›์†Œ์˜ ๊ฐœ์ˆ˜*65536์„ ํ•˜๊ณ  int()๋ฅผ ์”Œ์›Œ์„œ ์ •์ˆ˜๋ถ€๋ถ„๋งŒ ๋ฐ˜ํ™˜ํ•˜๋ฉด ๋œ๋‹ค.

๐Ÿ’ป์ฝ”๋“œ

๋ฆฌ์ŠคํŠธ๋กœ ์ง์ ‘ ๊ต์ง‘ํ•ฉ ๊ณ„์‚ฐ

def solution(str1, str2):
    _str1 = [str1[i:i+2].lower() for i in range(len(str1)-1) if str1[i:i+2].isalpha()]
    _str2 = [str2[i:i+2].lower() for i in range(len(str2)-1) if str2[i:i+2].isalpha()]
    if len(_str1) == 0 and len(_str2) == 0:
        return 65536
    
    union = len(_str1) + len(_str2)
    inter = [] # ๊ต์ง‘ํ•ฉ
    if len(_str1) > len(_str2):
        _str = _str2.copy()
        for s in _str1:
            if s in _str:
                _str.remove(s)
                inter.append(s)
    else:
        _str = _str1.copy()
        for s in _str2:
            if s in _str:
                _str.remove(s)
                inter.append(s)
    
    answer = int(len(inter)/(union-len(inter))*65536)
    return answer

Counter ์ด์šฉํ•ด์„œ ๊ต์ง‘ํ•ฉ๊ณผ ํ•ฉ์ง‘ํ•ฉ ๊ณ„์‚ฐ

from collections import Counter

def solution(str1, str2):
    _str1 = [str1[i:i+2].lower() for i in range(len(str1)-1) if str1[i:i+2].isalpha()]
    _str2 = [str2[i:i+2].lower() for i in range(len(str2)-1) if str2[i:i+2].isalpha()]
    
    if not _str1 and not _str2:
        return 65536
        
    c1, c2 = Counter(_str1), Counter(_str2)
    union = sum((c1|c2).values())
    inter = sum((c1&c2).values())
    
    return int(inter/union*65536)

๐Ÿ“ํ›„๊ธฐ

๋˜ ๋ฌธ์ œ๋ฅผ ์ œ๋Œ€๋กœ ์•ˆ ์ฝ์—ˆ๋‹ค...๋‘๊ธ€์ž์”ฉ ๋Š์œผ๋ผ๊ณ  ํ–ˆ๋Š”๋ฐ ํ•œ๊ธ€์ž์”ฉ ๋Š์–ด์„œ ํ’€๊ณ  ์žˆ๊ณ  ์ฐธ...๐Ÿคฆ๐Ÿป‍โ™€๏ธ๊ทธ๋ฆฌ๊ณ  Counter๋กœ ๋‹ค์‹œ ํ’€์—ˆ์„ ๋•Œ ์ฒ˜์Œ์—๋Š” ๋ถˆํ•„์š”ํ•˜๊ฒŒ Counter๊ฐ์ฒด๋ฅผ ์ƒˆ๋กœ ์ƒ์„ฑํ•ด์„œ ์‹œ๊ฐ„์€ ๋งŽ์ด ์•ˆ ์ค„์—ˆ๋Š”๋ฐ ์„ ์–ธํ•œ ๋‹ค์Œ์— ์žฌ์‚ฌ์šฉํ•˜๋Š” ์‹์œผ๋กœ ๋ฐ”๊ฟจ๋”๋‹ˆ ํ™•์‹คํžˆ ๋งŽ์ด ์ค„์–ด๋“  ๊ฒƒ ๊ฐ™๋‹ค.

์ €์ž‘์žํ‘œ์‹œ ๋น„์˜๋ฆฌ ๋ณ€๊ฒฝ๊ธˆ์ง€ (์ƒˆ์ฐฝ์—ด๋ฆผ)

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