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new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 00 : ๋ชฉํ‘œ
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
๋‚˜์˜ ๋ชฉํ‘œ 1. ์„ฑ์‹คํ•œ ํฌ์ŠคํŒ…์œผ๋กœ 1์ผ 1์ปค๋ฐ‹์„ ํ–ฅํ•ด ๋…ธ๋ ฅํ•˜๊ฒ ๋‹ค. 2. SW Academy์—์„œ ๋ฐฐ์šด Spring boot ๊ธฐ์ˆ ์„ ์ƒ์„ธํ•˜๊ฒŒ ์ •๋ฆฌํ•  ๊ฒƒ์ด๋‹ค. 2. ํ˜„์žฌ ๊ธฐ์ˆ  ๋ธ”๋กœ๊ทธ์˜ ๋””์ž์ธ์„ ๊ฐœ์„ ์‹œํ‚ฌ ๊ฒƒ์ด๋‹ค. SW Academy ๊ต์œก๊ณผ์ • - Backend ํ”„๋ ˆ์ž„์›Œํฌ๋ฅผ ์œ„ํ™˜ Java ์‹ฌํ™” ์‹ค๋ฆฌ์ฝ˜๋ฐธ๋ฆฌ์—์„œ ๋‚ ์•„์˜จ DataBase Spring Boot Basic 1 Spring Boot Basic 2 Spring Boot Basic 3 Spring Data Security 1 Spring Data Security 2
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 01 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ Java์˜ record ๊ฐœ๋… ์ •๋ฆฌํ•˜๊ธฐ
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 01 : ๊ฒฐ๊ณผ
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
1. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค - ๋‘ ์› ์‚ฌ์ด์˜ ์ •์ˆ˜ ์Œ (L2) ๐Ÿง  Algorithm 1import math 2 3def calc1(r): 4 result = 0 5 for i in range(1, r): 6 result += math.floor(math.sqrt(r**2 - i**2)) 7 return result*4 + r*4 + 1 8 9def calc2(r): 10 result = 0 11 for i in range(1, r): 12 a = math.sqrt(r**2 - i**2) 13 result += math.floor(a) 14 if a % 1 == 0: 15 result -= 1 16 return result*4 + r*4 + 1 17 18def solution(r1, r2): 19 return calc1(r2)-calc2(r1)+4 ๋ฌธ์ œ ๋‘ ์›์˜ ๋ฐ˜์ง€๋ฆ„ r1, r2๊ฐ€ ์ฃผ์–ด์ง„๋‹ค.
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 02 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ Springboot Testing ๊ณต๋ถ€ํ•˜๊ธฐ
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 02 : ๊ฒฐ๊ณผ
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
1. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค - ๋‹น๊ตฌ ์—ฐ์Šต (L2) ๐Ÿง  Algorithm 1def solution(m, n, startX, startY, balls): 2 answer = [] 3 for bx, by in balls: 4 tmp = [] 5 for x, y in [(-1*startX, startY), (startX, -1*startY), (startX, 2*n-startY), (2*m-startX, startY)]: 6 if bx==x and (y < 0 < by < startY or startY < by < n < y): 7 continue 8 if by==y and (x < 0 < bx < startX or startX < bx < m < x): 9 continue 10 tmp.
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 03 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ JDBC ์ •๋ฆฌ
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 03 : ๊ฒฐ๊ณผ
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
1. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค - ์ˆซ์ž ๋ณ€ํ™˜ํ•˜๊ธฐ (L2) ๐Ÿง  Algorithm 1from collections import deque 2 3def solution(x, y, n): 4 q = deque() 5 visited = [False] * 1000001 6 q.append((x, 0)) 7 8 while q: 9 cx, cnt = q.popleft() 10 if cx == y: 11 return cnt 12 13 if cx + n <= y and not visited[cx+n]: 14 q.append((cx+n, cnt+1)) 15 visited[cx+n] = True 16 if cx * 2 <= y and not visited[cx*2]: 17 q.
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 04 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ @RestController ์ •๋ฆฌ
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 04 : ๊ฒฐ๊ณผ
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
1. ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค - ๋””ํŽœ์Šค ๊ฒŒ์ž„ (L2) ๐Ÿง  Algorithm 1import heapq 2 3def solution(n, k, enemy): 4 heap = [] 5 cnt = 0 6 for i in enemy: 7 n -= i 8 heapq.heappush(heap, -i) 9 while n < 0: 10 k -= 1 11 if not heap or k < 0: 12 return cnt 13 tmp = -heapq.heappop(heap) 14 n += tmp 15 cnt += 1 16 return cnt ๋ฌธ์ œ n: ๊ฐ€์ง€๊ณ  ์žˆ๋Š” ๋ณ‘์‚ฌ ์ˆ˜ k: ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋Š” ๋ฌด์ ๊ถŒ ์Šคํ‚ฌ ์ˆ˜ enemy: ๋ผ์šด๋“œ๋งˆ๋‹ค ์กด์žฌํ•˜๋Š” ์  ์ˆ˜์˜ ๋ฐฐ์—ด ๋ผ์šด๋“œ๋งˆ๋‹ค enemy[i]๋ช… ๋งŒํผ ์†Œ๋ชจํ•˜์—ฌ enemy[i]๋งˆ๋ฆฌ์˜ ์ ์„ ๋ง‰์„ ์ˆ˜ ์žˆ๋‹ค ๋ฌด์ ๊ถŒ์„ ์ ์ ˆํžˆ ์‚ฌ์šฉํ•˜์—ฌ ๋ฒ„ํ‹ธ ์ˆ˜ ์žˆ๋Š” ์ตœ๋Œ€ ๋ผ์šด๋“œ ์ˆ˜๋ฅผ ๊ตฌํ•˜๋ผ TC input n: 7, k: 3, enemy: [4, 2, 4, 5, 3, 3, 1] 2.
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 05 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ JPA ์ •๋ฆฌํ•˜๊ธฐ
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 05 : ๊ฒฐ๊ณผ
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค - ๋‘ ํ ํ•ฉ ๊ฐ™๊ฒŒ ๋งŒ๋“ค๊ธฐ (L2) ๐Ÿง  Algorithm 1from collections import deque 2 3def solution(queue1, queue2): 4 sum1, sum2 = sum(queue1), sum(queue2) 5 dq1 = deque(queue1) 6 dq2 = deque(queue2) 7 cnt = 0 8 9 while cnt <= len(queue1)*2+1 and sum1 != sum2: 10 if sum1 > sum2: 11 tmp = dq1.popleft() 12 dq2.append(tmp) 13 sum1 -= tmp 14 sum2 += tmp 15 elif sum1 < sum2: 16 tmp = dq2.
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 06 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ MockMvc ์ •๋ฆฌํ•˜๊ธฐ
new [๋ชจ๊ฐ์ฝ”23ํ•˜๊ณ„] 06 : ๊ฒฐ๊ณผ
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค ํ•œ ๋ฌธ์ œ ํ’€๊ธฐ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค - n^2 ๋ฐฐ์—ด ์ž๋ฅด๊ธฐ (L2) ๐Ÿง  Algorithm 1def solution(n, left, right): 2 answer = [] 3 start = (left//n, left%n) 4 end = (right//n, right%n) 5 6 for i in range(start[0], end[0]+1): 7 line = [i+1]*(i+1) + [i for i in range(i+2, n+1)] 8 answer += line 9 10 return answer[start[1]:right-(start[0]*n)+1] ๋ฌธ์ œ ์ •์ˆ˜ n, left, right๊ฐ€ ์ฃผ์–ด์ง„๋‹ค n X n ํฌ๊ธฐ์˜ 2์ฐจ์› ๋ฐฐ์—ด์„ ๋งŒ๋“ ๋‹ค i=1,2,3.
new [๋ชจ๊ฐ์ฝ”24ํ•˜๊ณ„] 00 : ๋ชฉํ‘œ
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
๋‚˜์˜ ๋ชฉํ‘œ ์„ฑ์‹คํ•œ ํฌ์ŠคํŒ…์œผ๋กœ 1์ผ 1์ปค๋ฐ‹์„ ํ–ฅํ•ด ๋…ธ๋ ฅํ•˜๊ฒ ๋‹ค. ๋ฐฑ๋งˆ์ธํ„ด์‹ญ์„ ์ˆ˜ํ–‰ํ•˜๋ฉด์„œ ์—…๋ฌด์™€ ๊ด€๋ จํ•œ ๋‚ด์šฉ์„ ๊ณต๋ถ€ํ•˜๋ฉฐ ์ •๋ฆฌํ•˜๊ฒ ๋‹ค. ์ง์ ‘ ์šด์˜ ์ค‘์ธ ๋ธ”๋กœ๊ทธ๋ฅผ ๊ฐœ์„  ์‹œ์ผœ ๋‚˜๊ฐ€๊ฒ ๋‹ค.
new [๋ชจ๊ฐ์ฝ”24๋™๊ณ„] 01 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ LG CNS ๋ณธ์‚ฌ ์ธํ„ด ๊ต์œก ๋‚ด์šฉ ์ •๋ฆฌ Agile ๋ฐฉ๋ฒ•๋ก  Scrum ๋ฐฉ๋ฒ•๋ก 
new [๋ชจ๊ฐ์ฝ”24๋™๊ณ„] 02 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ SQL ๊ธฐ์ดˆ ๊ณต๋ถ€ DDL DML DCL TCL DDL (Data Definition Language) DML (Data Manipulation Language) DCL (Data Control Language) TCL (Transaction Control Language)
new [๋ชจ๊ฐ์ฝ”24๋™๊ณ„] 03 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ SQL ์„œ๋ธŒ์ฟผ๋ฆฌ ๊ณต๋ถ€
new [๋ชจ๊ฐ์ฝ”24๋™๊ณ„] 04 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ SQL Recursive Query ๊ณต๋ถ€ SQL ๋ฌธ์ œ ํ’€๋ฉด์„œ ๋ฐฐ์šด ๊ฒƒ ์ •๋ฆฌ
new [๋ชจ๊ฐ์ฝ”24๋™๊ณ„] 05 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ MSSQL ์ž„์‹œํ…Œ์ด๋ธ” ์ •๋ฆฌ MSSQL NOLOCK ์ •๋ฆฌ
new [๋ชจ๊ฐ์ฝ”24๋™๊ณ„] 06 : ๊ณ„ํš
๐Ÿ‘จโ€๐Ÿ’ป ๋ชจ๊ฐ์ฝ”
์˜ค๋Š˜์˜ ๋ชฉํ‘œ ํ…Œ์ŠคํŠธ ๊ธฐ๋ฒ• ์ข…๋ฅ˜ ์ •๋ฆฌํ•˜๊ธฐ
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