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dongwooklee96 / main.py
Last active June 24, 2021 14:59
1.10 ๋ฐฐ์—ด์˜ ํšŒ์ „
"""
## ๋ฌธ์ œ : 1.10 ๋ฐฐ์—ด์˜ ํšŒ์ „
- ์ž…๋ ฅ์œผ๋กœ ์ •์ˆ˜ํ˜• ๋ฐฐ์—ด๊ณผ k ๊ฐ’์ด ์ฃผ์–ด์ง€๋ฉด, ๊ฐ ์š”์†Œ๋ฅผ ์šฐ์ธก์œผ๋กœ
k ๋ฒˆ ์ด๋™ ๋ฐ ํšŒ์ „์„ ํ•ด๋ณด์ž.
- k๋Š” ์–‘์˜ ์ •์ˆ˜ ๊ฐ’์ด๋‹ค.
- ์˜ˆ๋ฅผ ๋“ค์–ด์„œ, nums ๋ฐฐ์—ด์— [1, 2, 3, 4] ๊ฐ€ ์žˆ๊ณ , k๊ฐ€ 1์ด๋ผ๋ฉด ์š”์†Œ๋Š” ์šฐ์ธก์œผ๋กœ 1์นธ์”ฉ
์ด๋™ ๋ฐ ํšŒ์ „ํ•˜์—ฌ [4, 1, 2, 3] ์ด ๋œ๋‹ค.
## ์ œํ•œ์‚ฌํ•ญ :
@dongwooklee96
dongwooklee96 / main.py
Created June 25, 2021 13:39
problem 1.11
"""
# ๋ฌธ์ œ 1.11 ๋น ์ง„ ์ˆซ์ž ์ฐพ๊ธฐ
- ์ฃผ์–ด์ง„ ์ •์ˆ˜ํ˜• ๋ฐฐ์—ด์€ 0 ~ n ๊นŒ์ง€์˜ ์ˆซ์ž๋ฅผ ๋‹ด๊ณ  ์žˆ๋Š”๋ฐ ์ด ์ค‘์— ๋น ์ง„ ์ˆซ์ž๋ฅผ ์ฐพ์•„๋ณด์ž.
- ๋ฐฐ์—ด์˜ ๊ฐ’์€ 0์—์„œ ์‹œ์ž‘ํ•˜์—ฌ n๊นŒ์ง€ n + 1๊ฐœ์˜ ์š”์†Œ๋ฅผ ๊ฐ€์งˆ ์ˆ˜ ์žˆ์ง€๋งŒ, ๋ฐฐ์—ด์˜ ํฌ๊ธฐ๋Š” n์œผ๋กœ
์ด ์ˆซ์ž ์ค‘์— ํ•˜๋‚˜๋Š” ๋น ์ ธ์žˆ๋‹ค๋Š” ๋œป์ด๋‹ค.
- ์˜ˆ๋ฅผ ๋“ค์–ด์„œ, nums = [3, 1, 0] ์ด๋ผ๋ฉด ๋น ์ง„ ์ˆซ์ž๋Š” 2์ด๋‹ค.
## ์ œํ•œ ์‚ฌํ•ญ
@dongwooklee96
dongwooklee96 / main.py
Created June 28, 2021 14:08
problem 1.3 problem 1.3
"""
## ๋ฌธ์ œ : 1.3 ๋‘์ˆ˜์˜ ํ•ฉ ์ฐพ๊ธฐ
์ฃผ์–ด์ง„ ์ •์ˆ˜ํ˜• ๋ฐฐ์—ด์—์„œ 2๊ฐœ์˜ ์ˆซ์ž๋ฅผ ์„ ํƒํ•˜์—ฌ, ๋”ํ•œ ๊ฐ’์ด ํŠน์ • ๋ชฉํ‘œ๊ฐ’์„ ๋งŒ๋“ค๋•Œ,
๊ทธ ์„ ํƒํ•œ 2๊ฐœ์˜ ์ •์ˆ˜๊ฐ€ ์žˆ๋Š” ๋ฐฐ์—ด์˜ ์ธ๋ฑ์Šค๋ฅผ ๋ฐ˜ํ™˜ํ•˜๋Š” ํ”„๋กœ๊ทธ๋žจ์„ ์ž‘์„ฑํ•˜๋ผ.
์ž…๋ ฅ๊ฐ’ : nums = [2, 7, 10, 19] target = 9
์ถœ๋ ฅ๊ฐ’ : [0, 1]
"""
from typing import List
@dongwooklee96
dongwooklee96 / main.py
Created June 29, 2021 14:18
problem 1.4
"""
## ๋ฌธ์ œ : 1.4
- ์ •๋ ฌ๋œ ๋ฐฐ์—ด์˜ ์š”์†Œ๋“ค์„ ์ค‘๋ณต ์—†์ด, ๋‹จ 1๋ฒˆ์”ฉ๋งŒ ๊ฐ€์งˆ ์ˆ˜ ์žˆ๋„๋ก ์ฃผ์–ด์ง„ ๋ฐฐ์—ด์„ ๊ทธ๋Œ€๋กœ ์ˆ˜์ •ํ•˜๊ณ ,
์ˆ˜์ •๋œ ๋ฐฐ์—ด์˜ ์ƒˆ๋กœ์šด ๊ธธ์ด๋ฅผ ๋ฐ˜ํ™˜ํ•˜๋ผ.
"""
from typing import List
@dongwooklee96
dongwooklee96 / main.py
Created June 30, 2021 14:15
recursive
"""
๋ฌธ์ œ : ๋ฐฐ์—ด์— ์žˆ๋Š” ์ˆซ์ž์˜ ์กฐํ•ฉ์œผ๋กœ ํŠน์ • ์ˆซ์ž๋ฅผ ๋งŒ๋“ค ์ˆ˜ ์žˆ๋Š”์ง€๋ฅผ ์•Œ์•„๋ณด๋Š” ๋ฌธ์ œ์ด๋‹ค.
์ดํ•ด๊ฐ€ ์ž˜ ๋˜์ง€ ์•Š๋Š”๋‹ค๋ฉด, ํ•œ์ค„ ํ•œ์ค„ ์ฝœ ์Šคํƒ์„ ๊ทธ๋ ค๋ณด๋ฉด์„œ ์ดํ•ดํ•ด๋ณด๋Š” ๊ฒƒ์ด ์ข‹๋‹ค.
"""
from typing import List
def group_sum(nums: List[int], subset: List[bool], target: int, i: int) -> bool:
"""
๋ฌธ์ œ 1.5.1: ์ •๋ ฌ๋œ ๋ฐฐ์—ด๊ณผ ๋ชฉํ‘œ๊ฐ’์ด ์žˆ์„ ๋•Œ, ๋ฐฐ์—ด์˜ ํ•ด๋‹น ์ธ๋ฑ์Šค๋ฅผ ๋ฐ˜ํ™˜ํ•˜๊ณ ,
์ฐพ์ง€ ๋ชปํ•œ๋‹ค๋ฉด, ์ •๋ ฌ๋œ ๋ฐฐ์—ด์ด ๋˜๋„๋ก ๋ชฉํ‘œ๊ฐ’์ด ๋ฐฐ์—ด์— ๋“ค์–ด๊ฐ€์•ผ ํ•˜๋Š” ์ธ๋ฑ์Šค๋ฅผ
๊ตฌํ•˜๋Š” ๋ฌธ์ œ์ด๋‹ค.
"""
from typing import List
def searchIndex(nums: List[int], target: int) -> int:
@dongwooklee96
dongwooklee96 / main.py
Created July 2, 2021 14:12
problem 1.6
"""
๋ฌธ์ œ 1.6: ์ฃผ์–ด์ง„ ๋‘ ๋ฐฐ์—ด (nums1, nums2)์„ ์ •๋ ฌ์„ ์œ ์ง€ํ•˜๋ฉด์„œ
๋ณ‘ํ•ฉ์„ ํ•ด๋ณด์ž.
"""
from typing import List
def merge(nums1: List[int], m: int, nums2: List[int], n: int) -> None:
i = m - 1
"""
๋ฌธ์ œ 1.7: ์ •๋ ฌ๋œ ๋ฐฐ์—ด nums1, nums2๊ฐ€ ์ฃผ์–ด์ง€๊ณ , ๊ฐ๊ฐ์˜ ํฌ๊ธฐ๋Š” m๊ณผ n์ด๋‹ค.
์ •๋ ฌ์„ ์œ ์ง€ํ•˜๋ฉด์„œ nums1 ๋ฐฐ์—ด๋ถ€ํ„ฐ ์ฑ„์›Œ๋‚˜๊ฐ€ nums2๊นŒ์ง€ ํ™•์žฅ์„ ํ•ด๋ณด์ž.
"""
from typing import List
def merge(nums1: List[int], m: int, nums2: List[int], n: int) -> List[int]:
for i, nums1_item in enumerate(nums1):
@dongwooklee96
dongwooklee96 / main.py
Created July 6, 2021 14:15
1.13.1 1.13.1
"""
๋ฌธ์ œ 1.13: ๊ณ ์œ ํ•œ ์ •์ˆ˜์˜ ์ง‘ํ•ฉ์œผ๋กœ ๋ฐฐ์—ด์ด ์ฃผ์–ด์ง€๋ฉด, ๊ฐ€๋Šฅํ•œ ๋ชจ๋“  ๋ถ€๋ถ„์ง‘ํ•ฉ์„ ๋ฐ˜ํ™˜ํ•˜์ž.
์ค‘๋ณต๋œ ๋ถ€๋ถ„์ง‘ํ•ฉ์€ ํ—ˆ์šฉํ•˜์ง€ ์•Š๋Š”๋‹ค.
์ž…๋ ฅ์œผ๋กœ [1, 2, 3]์ด ์ฃผ์–ด์ง€๋ฉด, ๊ฒฐ๊ณผ๋กœ [[], [1], [2], [3], [1, 2], [1, 3], [2, 3], [1, 2, 3]] ์„ ๋ฐ˜ํ™˜ํ•˜๋ฉด ๋œ๋‹ค.
## ์ œํ•œ ์‚ฌํ•ญ
- ์ž…๋ ฅ์€ ๊ณ ์œ ํ•œ ์ •์ˆ˜์˜ ์ง‘ํ•ฉ์œผ๋กœ ์ด๋ฃจ์–ด์ ธ์žˆ๋‹ค.
- ์ •์ˆ˜ํ˜• ๋ฐฐ์—ด
- ๋ฐ˜ํ™˜๊ฐ’์€ 2์ฐจ์› ์ •์ˆ˜ํ˜• ๋ฐฐ์—ด
@dongwooklee96
dongwooklee96 / main.py
Created July 7, 2021 14:00
1.13.1 1.13.1
"""
๋ฌธ์ œ 1.13: ๊ณ ์œ ํ•œ ์ •์ˆ˜์˜ ์ง‘ํ•ฉ์œผ๋กœ ๋ฐฐ์—ด์ด ์ฃผ์–ด์ง€๋ฉด, ๊ฐ€๋Šฅํ•œ ๋ชจ๋“  ๋ถ€๋ถ„์ง‘ํ•ฉ์„ ๋ฐ˜ํ™˜ํ•˜์ž.
์ค‘๋ณต๋œ ๋ถ€๋ถ„์ง‘ํ•ฉ์€ ํ—ˆ์šฉํ•˜์ง€ ์•Š๋Š”๋‹ค.
์ž…๋ ฅ์œผ๋กœ [1, 2, 3]์ด ์ฃผ์–ด์ง€๋ฉด, ๊ฒฐ๊ณผ๋กœ [[], [1], [2], [3], [1, 2], [1, 3], [2, 3], [1, 2, 3]] ์„ ๋ฐ˜ํ™˜ํ•˜๋ฉด ๋œ๋‹ค.
## ์ œํ•œ ์‚ฌํ•ญ
- ์ž…๋ ฅ์€ ๊ณ ์œ ํ•œ ์ •์ˆ˜์˜ ์ง‘ํ•ฉ์œผ๋กœ ์ด๋ฃจ์–ด์ ธ์žˆ๋‹ค.
- ์ •์ˆ˜ํ˜• ๋ฐฐ์—ด
- ๋ฐ˜ํ™˜๊ฐ’์€ 2์ฐจ์› ์ •์ˆ˜ํ˜• ๋ฐฐ์—ด