๋ณธ๋ฌธ ๋ฐ”๋กœ๊ฐ€๊ธฐ
๋ฐ˜์‘ํ˜•

Algorithm32

[LeetCode] 9. Palindrome Number ๐Ÿ“–๋ฌธ์ œ. ์ˆซ์ž๊ฐ€ ์ž…๋ ฅ๋˜๋ฉด ํ•ด๋‹น ์ˆซ์ž๊ฐ€ ํŒฐ๋ฆฐ๋“œ๋กฌ์ด๋ฉด true, ์•„๋‹ˆ๋ฉด false ๋ฅผ ์ถœ๋ ฅํ•˜์„ธ์š”. Given an integer x, return true if x is palindrome integer. An integer is a palindrome when it reads the same backward as forward. For example, 121 is a palindrome while 123 is not. Example 1: Input: x = 121 Output: true Explanation: 121 reads as 121 from left to right and from right to left. Example 2: Input: x = -121 Output: false Explanatio.. 2022. 4. 17.
[LeetCode] ๋ฆฟ์ฝ”๋“œ ์‹œ์ž‘ํ•˜๊ธฐ, Github์— ์ž๋™ ์ปค๋ฐ‹(LeetHub) ๋ฐฉ๋ฒ• https://leetcode.com/ LeetCode - The World's Leading Online Programming Learning Platform Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview. leetcode.com LeetCode๋Š” ์ „์„ธ๊ณ„์ ์œผ๋กœ ์œ ๋ช…ํ•œ Online Judge Platform ์ž…๋‹ˆ๋‹ค. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค์—์„œ๋„ ์ด๊ณณ ๋ฌธ์ œ๋ฅผ ๋ณ€ํ˜•ํ•ด์„œ ์ถœ์ œ๋˜๋Š” ๋ฌธ์ œ๊ฐ€ ๋งŽ์•˜์Šต๋‹ˆ๋‹ค. ๊ตฌ๊ธ€/๊นƒํ—ˆ๋ธŒ/ํŽ˜์ด์Šค๋ถ ๊ณ„์ •์œผ๋กœ ๊ฐ„ํŽธํ•˜๊ฒŒ ๊ฐ€์ž…ํ›„ ์‚ฌ์šฉ ํ•˜์‹ค์ˆ˜์žˆ์Šต๋‹ˆ๋‹ค. โœจLeetHub : Github ์— ์ž๋™์œผ๋กœ Comm.. 2022. 4. 16.
2021 KAKAO ๋ธ”๋ผ์ธ๋“œ ์ฝ”๋”ฉํ…Œ์ŠคํŠธ - ์‹ ๊ทœ ์•„์ด๋”” ์ถ”์ฒœ ์‹ ๊ทœ ์•„์ด๋”” ์ถ”์ฒœ ์นด์นด์˜ค์— ์ž…์‚ฌํ•œ ์‹ ์ž… ๊ฐœ๋ฐœ์ž ๋„ค์˜ค๋Š” "์นด์นด์˜ค๊ณ„์ •๊ฐœ๋ฐœํŒ€"์— ๋ฐฐ์น˜๋˜์–ด, ์นด์นด์˜ค ์„œ๋น„์Šค์— ๊ฐ€์ž…ํ•˜๋Š” ์œ ์ €๋“ค์˜ ์•„์ด๋””๋ฅผ ์ƒ์„ฑํ•˜๋Š” ์—…๋ฌด๋ฅผ ๋‹ด๋‹นํ•˜๊ฒŒ ๋˜์—ˆ์Šต๋‹ˆ๋‹ค. "๋„ค์˜ค"์—๊ฒŒ ์ฃผ์–ด์ง„ ์ฒซ ์—…๋ฌด๋Š” ์ƒˆ๋กœ ๊ฐ€์ž…ํ•˜๋Š” ์œ ์ €๋“ค์ด ์นด์นด์˜ค ์•„์ด๋”” ๊ทœ์น™์— ๋งž์ง€ ์•Š๋Š” ์•„์ด๋””๋ฅผ ์ž…๋ ฅํ–ˆ์„ ๋•Œ, ์ž…๋ ฅ๋œ ์•„์ด๋””์™€ ์œ ์‚ฌํ•˜๋ฉด์„œ ๊ทœ์น™์— ๋งž๋Š” ์•„์ด๋””๋ฅผ ์ถ”์ฒœํ•ด์ฃผ๋Š” ํ”„๋กœ๊ทธ๋žจ์„ ๊ฐœ๋ฐœํ•˜๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค. ๋‹ค์Œ์€ ์นด์นด์˜ค ์•„์ด๋””์˜ ๊ทœ์น™์ž…๋‹ˆ๋‹ค. ์•„์ด๋””์˜ ๊ธธ์ด๋Š” 3์ž ์ด์ƒ 15์ž ์ดํ•˜์—ฌ์•ผ ํ•ฉ๋‹ˆ๋‹ค. ์•„์ด๋””๋Š” ์•ŒํŒŒ๋ฒณ ์†Œ๋ฌธ์ž, ์ˆซ์ž, ๋นผ๊ธฐ(-), ๋ฐ‘์ค„(_), ๋งˆ์นจํ‘œ(.) ๋ฌธ์ž๋งŒ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๋‹จ, ๋งˆ์นจํ‘œ(.)๋Š” ์ฒ˜์Œ๊ณผ ๋์— ์‚ฌ์šฉํ•  ์ˆ˜ ์—†์œผ๋ฉฐ ๋˜ํ•œ ์—ฐ์†์œผ๋กœ ์‚ฌ์šฉํ•  ์ˆ˜ ์—†์Šต๋‹ˆ๋‹ค. "๋„ค์˜ค"๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์ด 7๋‹จ๊ณ„์˜ ์ˆœ์ฐจ์ ์ธ ์ฒ˜๋ฆฌ ๊ณผ์ •์„ ํ†ตํ•ด ์‹ ๊ทœ ์œ ์ €๊ฐ€ ์ž…๋ ฅ.. 2022. 4. 13.
[๊ตฌ๊ธ€์ฝ”ํ…Œ] GOCC48 - Coding - SWE Intern (Seoul) questions1, 2 ์•ˆ๋…•ํ•˜์„ธ์š” yunamom ์ž…๋‹ˆ๋‹ค ๐Ÿ˜Š Google’s Online Challenge [LIVE @ 09:00 KST] GOCC48 - Coding - SWE Intern (Seoul) ๋ฌธ์ œ1 / ๋ฌธ์ œ2 ํฌ์ŠคํŒ…ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค :D ๊ตฌ๊ธ€์ฝ”๋ฆฌ์•„ ์ง€๋งŒ ๋ชจ๋“  ๊ณผ์ •์€ ์˜์–ด๋‹ค! ๋‹ค๋ฅธ ํ™”๋ฉด ํด๋ฆญ์‹œ ๋ฐ”๋กœ ํ™”๋ฉด์ดํƒˆํ•˜๋ฉด ๋กœ๊ทธ์•„์›ƒ๋œ๋‹ค๊ตฌ ๊ฒฝ๊ณ ์ฐฝ์ด ๋œฌ๋‹ค. (๋ฌธ์ œ ๋ณต์‚ฌ X, ์ฝ”๋“œ๋ธ”๋Ÿญ์— ๋ณต๋ถ™๋„ X, ๋“€์–ผ๋ชจ๋‹ˆํ„ฐ X) ๐Ÿ“– ๋ฌธ์ œ 1. ์ฝ”๋”ฉํ…Œ์ŠคํŠธ ๋ณธ ์‚ฌ์ดํŠธ๋Š” Hackerearth ์ž…๋‹ˆ๋‹ค. LeetCode ๋Š” ๋งŽ์ด ๋“ค์–ด๋ณด์•˜๋Š”๋ฐ Hackerearth ์ด๊ณณ์€ ์ด๋ฒˆ์— ์ฒ˜์Œ๋ดค๋‹ค.. ๐Ÿ“– ๋ฌธ์ œ 2. ๋ฌธ์ œ2 ๊ฐ™์€ ๊ฒฝ์šฐ์—๋Š” ํ’€์ด๋ฅผ ํ•˜์ž๋ฉด, ๋‘๋ฐฐ์—ด์„ ํ•ฉ์นœํ›„ ์ œ์ผํฐ์ˆ˜, ์ œ์ผ์ž‘์€์ˆ˜ ์„ ๊ตฌํ•œ๋’ค์— max = 1+(์ œ์ผํฐ์ˆ˜*๋ฐฐ์—ด๊ธธ์ด-1); min = 1+(์ œ์ผ์ž‘์€์ˆ˜*๋ฐฐ์—ด๊ธธ.. 2022. 4. 9.
[๊ตฌ๊ธ€์ฝ”ํ…Œ] GOCC48 - Coding - SWE Intern (Seoul) ํ›„๊ธฐ ์•ˆ๋…•ํ•˜์„ธ์š” yunamom ์ž…๋‹ˆ๋‹ค :D ์ €๋ฒˆ์ฃผ์— ๊ตฌ๊ธ€์ฝ”๋ฆฌ์•„ ์†Œํ”„ํŠธ์›จ์–ด ์—”์ง€๋‹ˆ์–ด ์ธํ„ด ์ ‘์ˆ˜ํ›„ ์ฝ”๋”ฉํ…Œ์ŠคํŠธ ์ผ์ •์— ๊ด€ํ•œ ์ด๋ฉ”์ผ์„ ๋ฐ›์•˜๋Š”๋ฐ์š”. Google’s Online Challenge [LIVE @ 09:00 KST] 2022๋…„ 4์›” 8์ผ(๊ธˆ) ์˜ค์ „ 9์‹œ ๋ฐ”๋กœ! ์˜ค๋Š˜ ์˜จ๋ผ์ธ์ฝ”๋”ฉํ…Œ์ŠคํŠธ๋ฅผ ์น˜๋ฃฌ ํ›„๊ธฐ๋ฅผ ํฌ์ŠคํŒ…ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค ๐Ÿ˜Š ์—ฐ์Šต๋งํฌ : ํด๋ฆญ (๊ฐ€์ž…ํ›„ ์ด์šฉํ•˜์‹ค์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. gmail, github ๋“ฑ๋“ฑ) ๊ตฌ๊ธ€์ฝ”๋ฆฌ์•„ ์ง€๋งŒ ๋ชจ๋“  ๊ณผ์ •์€ ์˜์–ด๋‹ค! ๋‹ค๋ฅธ ํ™”๋ฉด ํด๋ฆญ์‹œ ๋ฐ”๋กœ ํ™”๋ฉด์ดํƒˆํ•˜๋ฉด ๋กœ๊ทธ์•„์›ƒ๋œ๋‹ค๊ตฌ ๊ฒฝ๊ณ ์ฐฝ์ด ๋œฌ๋‹ค. (์ฝ”๋“œ๋ธ”๋Ÿญ์— ๋ณต๋ถ™๋„ X) ์ฒซ๋ฒˆ์งธ ๋ฌธ์ œ๋Š” ์ œ๋Œ€๋กœ ํ’€์ง€๋„ ๋ชปํ–ˆ๋‹ค.. ( ์ง€๋ฌธ์ด ์ดํ•ด๊ฐ€ ์•ˆ๊ฐ”์Œ๐Ÿ˜ข ) ๐Ÿ’ก์ฝ”๋”ฉํ…Œ์ŠคํŠธ ๋ณธ ์‚ฌ์ดํŠธ๋Š” Hackerearth ์ด๋‹ค. LeetCode ๋Š” ๋งŽ์ด ๋“ค์–ด๋ณด์•˜๋Š”๋ฐ Hackerearth ์ด๊ณณ์€.. 2022. 4. 8.
[JAVA] ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค - ํ•ธ๋“œํฐ๋ฒˆํ˜ธ๊ฐ€๋ฆฌ๊ธฐ ํ•ธ๋“œํฐ ๋ฒˆํ˜ธ ๊ฐ€๋ฆฌ๊ธฐ ๐Ÿ’ก๋ฌธ์ œ ์„ค๋ช… ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ๋ชจ๋ฐ”์ผ์€ ๊ฐœ์ธ์ •๋ณด ๋ณดํ˜ธ๋ฅผ ์œ„ํ•ด ๊ณ ์ง€์„œ๋ฅผ ๋ณด๋‚ผ ๋•Œ ๊ณ ๊ฐ๋“ค์˜ ์ „ํ™”๋ฒˆํ˜ธ์˜ ์ผ๋ถ€๋ฅผ ๊ฐ€๋ฆฝ๋‹ˆ๋‹ค. ์ „ํ™”๋ฒˆํ˜ธ๊ฐ€ ๋ฌธ์ž์—ด phone_number๋กœ ์ฃผ์–ด์กŒ์„ ๋•Œ, ์ „ํ™”๋ฒˆํ˜ธ์˜ ๋’ท 4์ž๋ฆฌ๋ฅผ ์ œ์™ธํ•œ ๋‚˜๋จธ์ง€ ์ˆซ์ž๋ฅผ ์ „๋ถ€ *์œผ๋กœ ๊ฐ€๋ฆฐ ๋ฌธ์ž์—ด์„ ๋ฆฌํ„ดํ•˜๋Š” ํ•จ์ˆ˜, solution์„ ์™„์„ฑํ•ด์ฃผ์„ธ์š”. ์ œํ•œ ์กฐ๊ฑด phone_number๋Š” ๊ธธ์ด 4 ์ด์ƒ, 20์ดํ•˜์ธ ๋ฌธ์ž์—ด์ž…๋‹ˆ๋‹ค. ์ž…์ถœ๋ ฅ ์˜ˆ phone_number return "01033334444" "*******4444" "027778888" "*****8888" package ํ•ธ๋“œํฐ๋ฒˆํ˜ธ๊ฐ€๋ฆฌ๊ธฐ; class Solution { public String solution(String phone_number) { String answer = ""; for(.. 2022. 4. 6.
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