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[freemjstudio] WEEK 04 Solutions#2752

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Jul 19, 2026
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[freemjstudio] WEEK 04 Solutions#2752
freemjstudio merged 6 commits into
DaleStudy:mainfrom
freemjstudio:freemjstudio-week04

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@freemjstudio

@freemjstudio freemjstudio commented Jul 18, 2026

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๋‹ต์•ˆ ์ œ์ถœ ๋ฌธ์ œ

์ž‘์„ฑ์ž ์ฒดํฌ ๋ฆฌ์ŠคํŠธ

  • Projects์˜ ์˜ค๋ฅธ์ชฝ ๋ฒ„ํŠผ(โ–ผ)์„ ๋ˆŒ๋Ÿฌ ํ™•์žฅํ•œ ๋’ค, Week๋ฅผ ํ˜„์žฌ ์ฃผ์ฐจ๋กœ ์„ค์ •ํ•ด์ฃผ์„ธ์š”.
  • ๋ฌธ์ œ๋ฅผ ๋ชจ๋‘ ํ‘ธ์‹œ๋ฉด ํ”„๋กœ์ ํŠธ์—์„œ Status๋ฅผ In Review๋กœ ์„ค์ •ํ•ด์ฃผ์„ธ์š”.
  • ์ฝ”๋“œ ๊ฒ€ํ† ์ž 1๋ถ„ ์ด์ƒ์œผ๋กœ๋ถ€ํ„ฐ ์Šน์ธ์„ ๋ฐ›์œผ์…จ๋‹ค๋ฉด PR์„ ๋ณ‘ํ•ฉํ•ด์ฃผ์„ธ์š”.

๊ฒ€ํ† ์ž ์ฒดํฌ ๋ฆฌ์ŠคํŠธ

Important

๋ณธ์ธ ๋‹ต์•ˆ ์ œ์ถœ ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ๋‹ค๋ฅธ ๋ถ„ PR ํ•˜๋‚˜ ์ด์ƒ์„ ๋ฐ˜๋“œ์‹œ ๊ฒ€ํ† ๋ฅผ ํ•ด์ฃผ์…”์•ผ ํ•ฉ๋‹ˆ๋‹ค!

  • ๋ฐ”๋กœ ์ด์ „์— ์˜ฌ๋ผ์˜จ PR์— ๋ณธ์ธ์„ ์ฝ”๋“œ ๋ฆฌ๋ทฐ์–ด๋กœ ์ถ”๊ฐ€ํ•ด์ฃผ์„ธ์š”.
  • ๋ณธ์ธ์ด ๊ฒ€ํ† ํ•ด์•ผํ•˜๋Š” PR์˜ ๋‹ต์•ˆ ์ฝ”๋“œ์— ํ”ผ๋“œ๋ฐฑ์„ ์ฃผ์„ธ์š”.
  • ํ† ์š”์ผ ์ „๊นŒ์ง€ PR์„ ๋ณ‘ํ•ฉํ•  ์ˆ˜ ์žˆ๋„๋ก ์Šน์ธํ•ด์ฃผ์„ธ์š”.

@dalestudy

dalestudy Bot commented Jul 18, 2026

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๐Ÿ“Š freemjstudio ๋‹˜์˜ ํ•™์Šต ํ˜„ํ™ฉ

์ด๋ฒˆ ์ฃผ ์ œ์ถœ ๋ฌธ์ œ

๋ฌธ์ œ ๋‚œ์ด๋„ ์œ ํ˜• ๋ถ„์„
coin-change Medium โš ๏ธ ์œ ํ˜• ๋ถˆ์ผ์น˜
find-minimum-in-rotated-sorted-array Medium โœ… ์˜๋„ํ•œ ์œ ํ˜•
maximum-depth-of-binary-tree Easy โœ… ์˜๋„ํ•œ ์œ ํ˜•
merge-two-sorted-lists Easy โœ… ์˜๋„ํ•œ ์œ ํ˜•
word-search Medium โœ… ์˜๋„ํ•œ ์œ ํ˜•

๋ˆ„์  ํ•™์Šต ์š”์•ฝ

  • ํ’€์ดํ•œ ๋ฌธ์ œ: 8 / 75๊ฐœ
  • ์ด๋ฒˆ ์ฃผ ์œ ํ˜• ์ผ์น˜์œจ: 80% (5๋ฌธ์ œ ์ค‘ 4๋ฌธ์ œ ์ผ์น˜)

๋ฌธ์ œ ํ’€์ด ํ˜„ํ™ฉ

์นดํ…Œ๊ณ ๋ฆฌ ์ง„ํ–‰๋„ ์™„๋ฃŒ
Heap โ– โ– โ–กโ–กโ–กโ–กโ–ก 1 / 3 (Medium 1)
Array โ– โ– โ–กโ–กโ–กโ–กโ–ก 3 / 10 (Easy 2, Medium 1)
Binary โ– โ–กโ–กโ–กโ–กโ–กโ–ก 1 / 5 (Easy 1)
Dynamic Programming โ– โ–กโ–กโ–กโ–กโ–กโ–ก 2 / 11 (Medium 2)
String โ– โ–กโ–กโ–กโ–กโ–กโ–ก 1 / 10 (Easy 1)
Graph โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 8 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Interval โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 5 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Linked List โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 6 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Matrix โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 4 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Tree โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 14 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ

๐Ÿค– ์ด ๋Œ“๊ธ€์€ GitHub App์„ ํ†ตํ•ด ์ž๋™์œผ๋กœ ์ž‘์„ฑ๋˜์—ˆ์Šต๋‹ˆ๋‹ค.

๐Ÿ”ข API ์‚ฌ์šฉ๋Ÿ‰ (gpt-5-nano)
์š”์ฒญ ์ž…๋ ฅ ํ† ํฐ ์ถœ๋ ฅ ํ† ํฐ ํ•ฉ๊ณ„ ๋น„์šฉ
1 738 87 825 $0.000072
2 1,081 116 1,197 $0.000100
3 1,163 117 1,280 $0.000105
4 1,507 163 1,670 $0.000141
5 2,031 321 2,352 $0.000230
ํ•ฉ๊ณ„ 6,520 804 7,324 $0.000648

Comment thread merge-two-sorted-lists/freemjstudio.py
Comment thread maximum-depth-of-binary-tree/freemjstudio.py

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4์ฃผ์ฐจ ๊ณ ์ƒ ํ•˜์…จ์Šต๋‹ˆ๋‹ค!!

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์ˆ˜๊ณ ํ•˜์…จ์Šต๋‹ˆ๋‹ค. ๊น”๋”ํ•˜๊ฒŒ ํ’€์–ด์ฃผ์…”์„œ ์ฝ๊ธฐ ์ข‹์•˜๋˜ ๊ฑฐ ๊ฐ™์Šต๋‹ˆ๋‹ค!

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๊ฐ€๋…์„ฑ ์ข‹๊ฒŒ ์ž˜ ํ’€์–ด์ฃผ์‹  ๊ฑฐ ๊ฐ™์Šต๋‹ˆ๋‹ค.

Comment thread find-minimum-in-rotated-sorted-array/freemjstudio.py
Comment thread merge-two-sorted-lists/freemjstudio.py

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Dynamic Programming, Hash Map / Hash Set
  • ์„ค๋ช…: ๊ธˆ์•ก์— ๋Œ€ํ•ด ์ตœ์†Œ ๊ฐœ์ˆ˜์˜ ๋™์ „์œผ๋กœ ๊ตฌ์„ฑํ•˜๋Š” ๋ฌธ์ œ๋กœ, ์ƒํƒœ๋ฅผ dp[n]๋กœ ์ •์˜ํ•˜๊ณ  ์ ํ™”์‹์„ ์ด์šฉํ•ด ์ตœ์†Ÿ๊ฐ’์„ ๊ตฌํ•˜๋Š” ์ „ํ˜•์ ์ธ DP ํŒจํ„ด์ด๋‹ค. ํ•ด์‹œ ๋งต/์„ธํŠธ๋Š” ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•œ ๋™์ „ ๋ชฉ๋ก ๊ด€๋ฆฌ์— ๋ณด์กฐ์ ์œผ๋กœ ์‚ฌ์šฉ๋  ์ˆ˜ ์žˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

๋ณต์žก๋„
Time O(amount * U)
Space O(amount)

ํ”ผ๋“œ๋ฐฑ: usable_coins๋ฅผ ๋ชจ์•„ ๋‘๊ณ  ๊ฐ ๊ธˆ์•ก์— ๋Œ€ํ•ด ์ด์ „ ์ƒํƒœ๋ฅผ ์ด์šฉํ•ด ์ตœ์†Œ ๊ฐœ์ˆ˜๋ฅผ ๊ฐฑ์‹ ํ•œ๋‹ค. amount์˜ ํฌ๊ธฐ์™€ ์‚ฌ์šฉ ๊ฐ€๋Šฅํ•œ ๋™์ „ ์ˆ˜์— ๋”ฐ๋ผ ์‹œ๊ฐ„ ๋ณต์žก๋„๊ฐ€ ๊ฒฐ์ •๋œ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ๊ณ ๋ คํ•ด๋ณผ ๋งŒํ•œ ๋Œ€์•ˆ: ์ดˆ๊ธฐ ๊ธˆ์•ก์ด ํฐ ๊ฒฝ์šฐ BFS/๋™์ „ ๊ตํ™˜ ๋ฌธ์ œ์˜ ํ‘œ์ค€ DP ๋ฐฉ์‹์œผ๋กœ ๊ตฌํ˜„ํ•˜๋ฉด ์ง๊ด€์ ์ด๋ฉฐ, ๋ถˆํ•„์š”ํ•œ ๋ฃจํ”„๋ฅผ ์ค„์—ฌ ์ƒ์ˆ˜ ๊ณ„์ˆ˜๋„ ์ค„์ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

๐Ÿ’ก ํ’€์ด์— ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„๋ฅผ ์ฃผ์„์œผ๋กœ ๋‚จ๊ฒจ๋ณด์„ธ์š”!

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Binary Search
  • ์„ค๋ช…: ์ •๋ ฌ๋œ ๋ฐฐ์—ด์ด ํšŒ์ „๋˜์—ˆ์„ ๋•Œ ์ตœ์†Œ๊ฐ’์„ ์ด๋ถ„ ํƒ์ƒ‰์œผ๋กœ ์ฐพ๋Š” ๋ฌธ์ œ๋กœ, ์ขŒ์šฐ๋ฅผ ๋ฐ˜์œผ๋กœ ๋‚˜๋ˆ  ์กฐ๊ฑด์— ๋”ฐ๋ผ ํƒ์ƒ‰ ๋ฒ”์œ„๋ฅผ ์ขํžˆ๋Š” ์ด๋ถ„ ํƒ์ƒ‰ ํŒจํ„ด์ด ์‚ฌ์šฉ๋ฉ๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

๋ณต์žก๋„
Time O(log n)
Space O(1)

ํ”ผ๋“œ๋ฐฑ: ์ •๋ ฌ ์ƒํƒœ์˜ ์ผ๋ถ€ ํŠน์„ฑ์„ ์ด์šฉํ•ด ์ค‘์•™๊ฐ’๊ณผ ๋ ๊ฐ’ ๋น„๊ต๋กœ ๋ฒ”์œ„๋ฅผ ์ ˆ๋ฐ˜์œผ๋กœ ์ถ•์†Œํ•œ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ํ˜„์žฌ ๊ตฌํ˜„์€ min_value ์ดˆ๊ธฐํ™”๊ฐ€ ์ƒ์ˆ˜๋กœ ์žกํ˜€ ์žˆ์ง€๋งŒ, ์ผ๋ฐ˜์ ์œผ๋กœ nums[mid]์™€ nums[right] ๋น„๊ต๋ฅผ ํ†ตํ•ด ๋” ๋ช…ํ™•ํ•˜๊ฒŒ ๊ตฌํ˜„ ๊ฐ€๋Šฅํ•˜๋ฉฐ, ์ค‘๋ณต ์›์†Œ ์ฒ˜๋ฆฌ๊นŒ์ง€ ๊ณ ๋ คํ•˜๋ฉด ์•ˆ์ „ํ•ฉ๋‹ˆ๋‹ค.

๐Ÿ’ก ํ’€์ด์— ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„๋ฅผ ์ฃผ์„์œผ๋กœ ๋‚จ๊ฒจ๋ณด์„ธ์š”!

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Depth-First Search, Binary Search
  • ์„ค๋ช…: ์ž์‹ ๋…ธ๋“œ๋กœ ์žฌ๊ท€์ ์œผ๋กœ ํƒ์ƒ‰ํ•˜๋ฉฐ ํŠธ๋ฆฌ์˜ ๊นŠ์ด๋ฅผ ๊ณ„์‚ฐํ•˜๋Š” ๋ฐฉ์‹์œผ๋กœ DFS ํŒจํ„ด์— ํ•ด๋‹นํ•ฉ๋‹ˆ๋‹ค. ์žฌ๊ท€๋ฅผ ํ†ตํ•ด ์ขŒ์šฐ ์„œ๋ธŒํŠธ๋ฆฌ์˜ ์ตœ๋Œ€ ๊นŠ์ด๋ฅผ ๊ตฌํ•˜๊ณ  1์„ ๋”ํ•ด ์ตœ๋Œ“๊ฐ’์„ ๋ฐ˜ํ™˜ํ•ฉ๋‹ˆ๋‹ค. Binary Search๋Š” ํŠธ๋ฆฌ ๊ตฌ์กฐ์˜ ๋ถ„ํ•  ํƒ์ƒ‰์œผ๋กœ ๊ฐ„์ฃผ๋  ์ˆ˜ ์žˆ์ง€๋งŒ ์ฃผ๋œ ํŒจํ„ด์€ DFS์ž…๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

๋ณต์žก๋„
Time O(n)
Space O(h)

ํ”ผ๋“œ๋ฐฑ: ์ž์‹ ๋…ธ๋“œ๋ฅผ ์žฌ๊ท€์ ์œผ๋กœ ํƒ์ƒ‰ํ•ด ์ขŒ์šฐ ๊นŠ์ด์˜ ์ตœ๋Œ“๊ฐ’์— +1์„ ๋”ํ•œ๋‹ค. ์Šคํƒ ๊นŠ์ด๋Š” ํŠธ๋ฆฌ์˜ ๋†’์ด์— ๋น„๋ก€ํ•œ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ๊ผญ ์žฌ๊ท€ ๋Œ€์‹  ๋ช…์‹œ์  ์Šคํƒ์œผ๋กœ ๊ตฌํ˜„ํ•ด ์‹œ์Šคํ…œ ์Šคํƒ ์˜ค๋ฒ„ํ”Œ๋กœ๋ฅผ ํ”ผํ•˜๋Š” ๋ฐฉ๋ฒ•๋„ ์žˆ์Œ.

๐Ÿ’ก ํ’€์ด์— ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„๋ฅผ ์ฃผ์„์œผ๋กœ ๋‚จ๊ฒจ๋ณด์„ธ์š”!

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Two Pointers, Merge Type (not in list), Linked List
  • ์„ค๋ช…: ๋‘ ๊ฐœ์˜ ์ •๋ ฌ๋œ ์—ฐ๊ฒฐ ๋ฆฌ์ŠคํŠธ๋ฅผ ์ˆœํšŒํ•˜๋ฉฐ ํฌ์ธํ„ฐ ๋‘ ๊ฐœ๋กœ ์ž‘์€ ๊ฐ’์„ ์ฐจ๋ก€๋กœ ์—ฐ๊ฒฐ ๋ฆฌ์ŠคํŠธ์— ๋ถ™์ด๋Š” ์ „ํ˜•์ ์ธ Two Pointers ํŒจํ„ด์ด๋ฉฐ, ์—ฐ๊ฒฐ ๋ฆฌ์ŠคํŠธ๋ฅผ ๋‹ค๋ฃจ๋Š” ๋ฐฉ์‹์ด ํฌํ•จ๋˜์–ด ์žˆ์Šต๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

๋ณต์žก๋„
Time O(n + m)
Space O(1)

ํ”ผ๋“œ๋ฐฑ: ๋‘ ํฌ์ธํ„ฐ๋ฅผ ์ด์šฉํ•ด ์ฐจ๋ก€๋Œ€๋กœ ๋…ธ๋“œ๋ฅผ ์—ฐ๊ฒฐ ๋ฆฌ์ŠคํŠธ์— ๋ถ™์ด๊ณ  ๋‚จ์€ ๋…ธ๋“œ๋ฅผ ๋’ค์— ์—ฐ๊ฒฐํ•œ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ์žฌ๊ท€ ๋ฐฉ์‹์œผ๋กœ๋„ ๊ตฌํ˜„ ๊ฐ€๋Šฅํ•˜๋‚˜ ์Šคํƒ ๊นŠ์ด๊ฐ€ ์ปค์งˆ ์ˆ˜ ์žˆ์–ด ํ˜„์žฌ์˜ ๋ฐ˜๋ณต ๊ตฌํ˜„์ด ์•ˆ์ •์ ์ด๋‹ค.

๐Ÿ’ก ํ’€์ด์— ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„๋ฅผ ์ฃผ์„์œผ๋กœ ๋‚จ๊ฒจ๋ณด์„ธ์š”!

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Depth-First Search, Backtracking
  • ์„ค๋ช…: ์ฝ”๋“œ๋Š” DFS๋กœ ์ธ์ ‘ํ•œ ๊ธ€์ž๋ฅผ ํƒ์ƒ‰ํ•˜๋ฉฐ ๋ฐฉ๋ฌธ ์—ฌ๋ถ€๋ฅผ ๊ด€๋ฆฌํ•˜๊ณ , ๋‹จ์–ด๋ฅผ ๊ตฌ์„ฑํ•˜๋Š” ๋ชจ๋“  ๊ฒฝ๋กœ๋ฅผ ์žฌ๊ท€์ ์œผ๋กœ ์‹œ๋„ํ•˜๋Š” ๋ฐฑํŠธ๋ž˜ํ‚น ๋ฐฉ์‹์ด ํ•ต์‹ฌ์ž…๋‹ˆ๋‹ค. ๋ณด๋“œ์˜ ๊ฐ ์œ„์น˜์—์„œ ์‹œ์ž‘ํ•ด ์กฐ๊ฑด์— ๋งž๋Š” ๊ฒฝ๋กœ๋ฅผ ์ฐพ์œผ๋ฉด ์ข…๋ฃŒํ•ฉ๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

๋ณต์žก๋„
Time O(N * 4^L)
Space O(L)

ํ”ผ๋“œ๋ฐฑ: ๊ฐ ์œ„์น˜์—์„œ ์ธ์ ‘ํ•œ 4๋ฐฉํ–ฅ์œผ๋กœ DFS๋ฅผ ์ˆ˜ํ–‰ํ•˜๋ฉด์„œ ๋‹จ์–ด ๊ธธ์ด์— ๋งž์ถฐ ๊ฒฝ๋กœ๋ฅผ ์ถ”์ ํ•œ๋‹ค. ๋ฐฉ๋ฌธ ์ถ”์ ์ด ํ•„์š”ํ•˜๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ๋ฐฑํŠธ๋ž˜ํ‚น ๋ฐ ๊ฐ€์ง€์น˜๊ธฐ๋ฅผ ๊ฐ•ํ™”ํ•˜๊ณ  ์ค‘๋ณต ๊ฒฝ๋กœ ํƒ์ƒ‰ ๋ฐฉ์ง€ ๋กœ์ง์„ ๋” ๋ช…ํ™•ํžˆ ํ•˜๋ฉด ์„ฑ๋Šฅ์ด ๊ฐœ์„ ๋  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

๐Ÿ’ก ํ’€์ด์— ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„๋ฅผ ์ฃผ์„์œผ๋กœ ๋‚จ๊ฒจ๋ณด์„ธ์š”!

@freemjstudio
freemjstudio merged commit 28ce3ba into DaleStudy:main Jul 19, 2026
1 check passed
okyungjin pushed a commit to okyungjin/leetcode-study that referenced this pull request Jul 20, 2026
* merged-two-sorted-lists

* maximum-depth-of-binary-tree/freemjstudio.py

* coin change

* add: coin change solution by freemjstudio

* find-minimum-in-rotated-sorted-array

* word-search
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