BOJ. Cubing (5373)
Archived technical note: BOJ. Cubing (5373).
Category
Code
277 articles.
2022-03-13
BOJ 7469 - K-th Number
Archived technical note: BOJ 7469 - K-th Number.
BOJ 1520 - Downhill Paths
Archived technical note: BOJ 1520 - Downhill Paths.
BOJ. Match The Numbers (2494)
Archived technical note: BOJ. Match The Numbers (2494).
BOJ. Square (7626)
Archived technical note: BOJ. Square (7626).
BOJ. Line Group (2162)
Archived technical note: BOJ. Line Group (2162).
BOJ. Crossing Lines 3 (20149)
Archived technical note: BOJ. Crossing Lines 3 (20149).
BOJ 1069 - Going Home
Archived technical note: BOJ 1069 - Going Home.
BOJ. Two Circles (7869)
Archived technical note: BOJ. Two Circles (7869).
BOJ. Crossing Lines (17386)
Archived technical note: BOJ. Crossing Lines (17386).
BOJ. Crossing Lines 2 (17387)
Archived technical note: BOJ. Crossing Lines 2 (17387).
BOJ. The Area Of The Polygon (2166)
Archived technical note: BOJ. The Area Of The Polygon (2166).
BOJ. Passionate Gang-Ho 4 (11378)
Archived technical note: BOJ. Passionate Gang-Ho 4 (11378).
BOJ. Maximum Flow (6086)
Archived technical note: BOJ. Maximum Flow (6086).
BOJ. Passionate Gang-Ho 2 (11376)
Archived technical note: BOJ. Passionate Gang-Ho 2 (11376).
BOJ. Passionate Gang-Ho (11375)
Archived technical note: BOJ. Passionate Gang-Ho (11375).
BOJ. Palindrome Is Not A Palindrome (15927)
Archived technical note: BOJ. Palindrome Is Not A Palindrome (15927).
BOJ. Allocating Cattle Shed (2188)
Archived technical note: BOJ. Allocating Cattle Shed (2188).
BOJ. Round Trip From City To City (17412)
Archived technical note: BOJ. Round Trip From City To City (17412).
BOJ. String And Query (13713)
Archived technical note: BOJ. String And Query (13713).
BOJ. Repeated Pattern (16229)
Archived technical note: BOJ. Repeated Pattern (16229).
AtCoder. ABC 238 C 1111gal password
Archived technical note: AtCoder. ABC 238 C 1111gal password.
AtCoder. ABC 238 D ABC Transform
Archived technical note: AtCoder. ABC 238 D ABC Transform.
BOJ. Report Problem No.15164 (16163)
Archived technical note: BOJ. Report Problem No.15164 (16163).
BOJ. Find Kth Shortest Path (1854)
Archived technical note: BOJ. Find Kth Shortest Path (1854).
BOJ. Ship (1092)
Archived technical note: BOJ. Ship (1092).
BOJ. Sensor (2212)
Archived technical note: BOJ. Sensor (2212).
BOJ. Castle Difense (17135)
Archived technical note: BOJ. Castle Difense (17135).
BOJ. Castle Difense (2473)
Archived technical note: BOJ. Castle Difense (2473).
BOJ. Puyo Puyo (11559)
Archived technical note: BOJ. Puyo Puyo (11559).
BOJ. King Of Fishing (17143)
Archived technical note: BOJ. King Of Fishing (17143).
BOJ. Synthesize Solutions (14921)
Archived technical note: BOJ. Synthesize Solutions (14921).
BOJ. Convey News (1135)
Archived technical note: BOJ. Convey News (1135).
BOJ. Make A Big Number (16496)
Archived technical note: BOJ. Make A Big Number (16496).
BOJ. Cheese (2638)
Archived technical note: BOJ. Cheese (2638).
BOJ. Two-Dimenstion Array And Operation (17140)
Archived technical note: BOJ. Two-Dimenstion Array And Operation (17140).
BOJ. CCW (11758)
Archived technical note: BOJ. CCW (11758).
Tree Investment
Archived technical note: Tree Investment.
BOJ. Four Numbers Of With Sum (7453)
Archived technical note: BOJ. Four Numbers Of With Sum (7453).
BOJ. Lecture Room Assignment (11000)
Archived technical note: BOJ. Lecture Room Assignment (11000).
BOJ. N th Biggest Number (2075)
Archived technical note: BOJ. N th Biggest Number (2075).
LeetCode. 1028. Recover a Tree From Preorder Traversal
Archived technical note: LeetCode. 1028. Recover a Tree From Preorder Traversal.
BOJ. Race (2517)
Archived technical note: BOJ. Race (2517).
BOJ. Candy Box (2243)
Archived technical note: BOJ. Candy Box (2243).
BOJ. Manipulate Ladder (15684)
Archived technical note: BOJ. Manipulate Ladder (15684).
BOJ. Bind A Number (1744)
Archived technical note: BOJ. Bind A Number (1744).
BOJ. Scale (2437)
Archived technical note: BOJ. Scale (2437).
BOJ. Perfect Binary Tree (9934)
Archived technical note: BOJ. Perfect Binary Tree (9934).
BOJ. Boggle (9202)
Archived technical note: BOJ. Boggle (9202).
BOJ. Save The Sheep (16437)
Archived technical note: BOJ. Save The Sheep (16437).
BOJ. Distance Between Vertices (1761)
Archived technical note: BOJ. Distance Between Vertices (1761).
BOJ 1240 — Distance Between Nodes
Archived technical note: BOJ 1240 — Distance Between Nodes.
BOJ. Cheese (2636)
Archived technical note: BOJ. Cheese (2636).
BOJ. Is This Tree? (6416)
Archived technical note: BOJ. Is This Tree? (6416).
BOJ. Dragon Curve (15685)
Archived technical note: BOJ. Dragon Curve (15685).
BOJ. Factory (7578)
Archived technical note: BOJ. Factory (7578).
BOJ. Company Culture 1 (14267)
Archived technical note: BOJ. Company Culture 1 (14267).
BOJ. Binary Tree (13325)
Archived technical note: BOJ. Binary Tree (13325).
BOJ. Tree (4256)
Archived technical note: BOJ. Tree (4256).
BOJ. Height And Width Of Tree (2250)
Archived technical note: BOJ. Height And Width Of Tree (2250).
BOJ. Slope (14890)
Archived technical note: BOJ. Slope (14890).
BOJ. LCA (11437)
Archived technical note: BOJ. LCA (11437).
BOJ. Phone Number List (5052)
Archived technical note: BOJ. Phone Number List (5052).
Memo. To prove
Archived technical note: Memo. To prove.
BOJ 17144 — Fine Dust Simulation
Archived technical note: BOJ 17144 — Fine Dust Simulation.
BOJ 1339 - Word Math
Archived technical note: BOJ 1339 - Word Math.
BOJ 2169 — Robot Control
Archived technical note: BOJ 2169 — Robot Control.
BOJ 15683 — CCTV Surveillance
Archived technical note: BOJ 15683 — CCTV Surveillance.
BOJ. Population Movement (16234)
Archived technical note: BOJ. Population Movement (16234).
BOJ. Marble Escape 2 (13460)
Archived technical note: BOJ. Marble Escape 2 (13460).
BOJ. Tetromino (14500)
Archived technical note: BOJ. Tetromino (14500).
BOJ 14503 — Robot Vacuum (14503)
Archived technical note: BOJ 14503 — Robot Vacuum (14503).
BOJ. Snake (3190)
Archived technical note: BOJ. Snake (3190).
BOJ. Roll The Dice (14499)
Archived technical note: BOJ. Roll The Dice (14499).
BOJ. Baby Shark (16236)
Archived technical note: BOJ. Baby Shark (16236).
BOJ. Chicken Delivery (15686)
Archived technical note: BOJ. Chicken Delivery (15686).
BOJ. Longest Palindrome Substring (13275)
Archived technical note: BOJ. Longest Palindrome Substring (13275).
BOJ. Reason the fox came up to Island (17131)
Archived technical note: BOJ. Reason the fox came up to Island (17131).
LeetCode. 43. Multiply Strings
Archived technical note: LeetCode. 43. Multiply Strings.
BOJ. Minimum Value (10999)
Archived technical note: BOJ. Minimum Value (10999).
BOJ. Histogram (1725)
Archived technical note: BOJ. Histogram (1725).
BOJ. Sum of numbers 7 (2268)
Archived technical note: BOJ. Sum of numbers 7 (2268).
BOJ. Coffe Shop (1275)
Archived technical note: BOJ. Coffe Shop (1275).
BOJ. Minimum Value (10868)
Archived technical note: BOJ. Minimum Value (10868).
BOJ. Water taxi (2836)
Archived technical note: BOJ. Water taxi (2836).
BOJ. Northwesterly Wind (5419)
Archived technical note: BOJ. Northwesterly Wind (5419).
BOJ. line Drawing (2170)
Archived technical note: BOJ. line Drawing (2170).
BOJ. ATM (4013)
Archived technical note: BOJ. ATM (4013).
Codeforces Round 771 (Div. 2) A. Reverse
Archived technical note: Codeforces Round 771 (Div. 2) A. Reverse.
Codeforces Round 771 (Div. 2) B. Odd Swap Sort
Archived technical note: Codeforces Round 771 (Div. 2) B. Odd Swap Sort.
Codeforces Round 771 (Div. 2) C. Inversion Graph
Archived technical note: Codeforces Round 771 (Div. 2) C. Inversion Graph.
Codeforces Round 771 (Div. 2) D. Big Brush
Archived technical note: Codeforces Round 771 (Div. 2) D. Big Brush.
BOJ. 2-SAT - 4 (11281)
Archived technical note: BOJ. 2-SAT - 4 (11281).
AtCoder. Regular Contest 135 A Floor, Ceil Decomposition
Archived technical note: AtCoder. Regular Contest 135 A Floor, Ceil Decomposition.
AtCoder. Regular Contest 135 B Sum of Three Terms
Archived technical note: AtCoder. Regular Contest 135 B Sum of Three Terms.
AtCoder. Regular Contest 135 C XOR to All
Archived technical note: AtCoder. Regular Contest 135 C XOR to All.
Codeforces Global Round 19 B. MEX and Array
Archived technical note: Codeforces Global Round 19 B. MEX and Array.
BOJ. Idol (3648)
Archived technical note: BOJ. Idol (3648).
Codeforces Global Round 19 C. Andrew and Stones
Archived technical note: Codeforces Global Round 19 C. Andrew and Stones.
Codeforces Global Round 19 A. Sorting Parts
Archived technical note: Codeforces Global Round 19 A. Sorting Parts.
LeetCode. 100. Same Tree
Archived technical note: LeetCode. 100. Same Tree.
BOJ. 2-SAT - 3 (11280)
Archived technical note: BOJ. 2-SAT - 3 (11280).
BOJ. Tree and Query 2 (13511)
Archived technical note: BOJ. Tree and Query 2 (13511).
BOJ. Soccer Tactics (3977)
Archived technical note: BOJ. Soccer Tactics (3977).
BOJ. Domino (4196)
Archived technical note: BOJ. Domino (4196).
BOJ. Palindrome Devision (1509)
Archived technical note: BOJ. Palindrome Devision (1509).
BOJ. Find Minimum (11003)
Archived technical note: BOJ. Find Minimum (11003).
BOJ. Road Network (3176)
Archived technical note: BOJ. Road Network (3176).
BOJ. LCA 2 (11438)
Archived technical note: BOJ. LCA 2 (11438).
BOJ. Composite Function And Query (17435)
Archived technical note: BOJ. Composite Function And Query (17435).
BOJ. Lowest Common Ancestor (3584)
Archived technical note: BOJ. Lowest Common Ancestor (3584).
BOJ. SeongYeon Park (1086)
Archived technical note: BOJ. SeongYeon Park (1086).
Codeforces Round 770 (Div. 2) A. Reverse and Concatenate
Archived technical note: Codeforces Round 770 (Div. 2) A. Reverse and Concatenate.
Codeforces Round 770 (Div. 2) B. Fortune Telling
Archived technical note: Codeforces Round 770 (Div. 2) B. Fortune Telling.
BOJ. Traveling Salesman problem (2098)
Archived technical note: BOJ. Traveling Salesman problem (2098).
BOJ. RGB Distance 2 (17404)
Archived technical note: BOJ. RGB Distance 2 (17404).
BOJ. Final Ranking (3665)
Archived technical note: BOJ. Final Ranking (3665).
BOJ. Workbook (1766)
Archived technical note: BOJ. Workbook (1766).
BOJ. Distributed Processing (1009)
Archived technical note: BOJ. Distributed Processing (1009).
AtCoder. ABC 238 A Exponential or Quadratic
Archived technical note: AtCoder. ABC 238 A Exponential or Quadratic.
AtCoder. ABC 238 B Pizza
Archived technical note: AtCoder. ABC 238 B Pizza.
AtCoder. ABC 238 C digitnum
Archived technical note: AtCoder. ABC 238 C digitnum.
BOJ. Hue Circle (2482)
Archived technical note: BOJ. Hue Circle (2482).
BOJ. ACM Craft (1005)
Archived technical note: BOJ. ACM Craft (1005).
BOJ. Advertisement (1305)
Archived technical note: BOJ. Advertisement (1305).
BOJ. Independent Set of Tree. (2213)
Archived technical note: BOJ. Independent Set of Tree. (2213).
BOJ. excellence town (1949)
Archived technical note: BOJ. excellence town (1949).
BOJ. Society Service(SNS) (2533)
Archived technical note: BOJ. Society Service(SNS) (2533).
BOJ. Phone Keyboard (5670)
Archived technical note: BOJ. Phone Keyboard (5670).
BOJ. Clock pictures (10266)
Archived technical note: BOJ. Clock pictures (10266).
AtCoder. ABC 237 E Skiing
Archived technical note: AtCoder. ABC 237 E Skiing.
AtCoder. ABC 237 D LR insertion
Archived technical note: AtCoder. ABC 237 D LR insertion.
AtCoder. ABC 237 C kasaka
Archived technical note: AtCoder. ABC 237 C kasaka.
AtCoder. ABC 237 B Matrix Transposition
Archived technical note: AtCoder. ABC 237 B Matrix Transposition.
AtCoder. ABC 237 A Not Overflow
Archived technical note: AtCoder. ABC 237 A Not Overflow.
BOJ. Find (1786)
Archived technical note: BOJ. Find (1786).
BOJ. String set (14425)
Archived technical note: BOJ. String set (14425).
BOJ. Ant tunnel (14725)
Archived technical note: BOJ. Ant tunnel (14725).
BOJ. String square (4354)
Archived technical note: BOJ. String square (4354).
BOJ. Two Liquid (2470)
Archived technical note: BOJ. Two Liquid (2470).
BOJ. Knapsack problem (1450)
Archived technical note: BOJ. Knapsack problem (1450).
BOJ. Sum of Two Numbers (3273)
Archived technical note: BOJ. Sum of Two Numbers (3273).
BOJ. Subsequence sum (1806)
Archived technical note: BOJ. Subsequence sum (1806).
BOJ. Stick (1094)
Archived technical note: BOJ. Stick (1094).
BOJ. Determine task (1311)
Archived technical note: BOJ. Determine task (1311).
BOJ. Line up (2252)
Archived technical note: BOJ. Line up (2252).
BOJ. Matrix multiplication order (11049)
Archived technical note: BOJ. Matrix multiplication order (11049).
BOJ. Consecutive prime sum (1644)
Archived technical note: BOJ. Consecutive prime sum (1644).
BOJ. Set (11723)
Archived technical note: BOJ. Set (11723).
BOJ. Strongly Connected Component (2150)
Archived technical note: BOJ. Strongly Connected Component (2150).
BOJ. Tree And Query (15681)
Archived technical note: BOJ. Tree And Query (15681).
BOJ. Make Bridge(2) (17472)
Archived technical note: BOJ. Make Bridge(2) (17472).
BOJ. Planet Tunnel (2887)
Archived technical note: BOJ. Planet Tunnel (2887).
BOJ. MST (Minimum Spanning Tree) (1197)
Archived technical note: BOJ. MST (Minimum Spanning Tree) (1197).
BOJ. Digital Video Disk (9345)
Archived technical note: BOJ. Digital Video Disk (9345).
BOJ. Josephus problem(2) (1168)
Archived technical note: BOJ. Josephus problem(2) (1168).
BOJ. Data Structure (12899)
Archived technical note: BOJ. Data Structure (12899).
BOJ. Police Car (2618)
Archived technical note: BOJ. Police Car (2618).
BOJ. Array and Query (16975)
Archived technical note: BOJ. Array and Query (16975).
AtCoder. ABC 235 D - Multiply and Rotate
Archived technical note: AtCoder. ABC 235 D - Multiply and Rotate.
AtCoder. ABC 235 A - Rotate
Archived technical note: AtCoder. ABC 235 A - Rotate.
AtCoder. ABC 235 B Climbing Takahashi
Archived technical note: AtCoder. ABC 235 B Climbing Takahashi.
AtCoder. ABC 235 C The Kth Time Query
Archived technical note: AtCoder. ABC 235 C The Kth Time Query.
BOJ. Floyd(2) (11780)
Archived technical note: BOJ. Floyd(2) (11780).
BOJ. Get Miminum Cost(2) (11779)
Archived technical note: BOJ. Get Miminum Cost(2) (11779).
BOJ. DSLR (9019)
Archived technical note: BOJ. DSLR (9019).
BOJ. Hide And Sick(4) (13913)
Archived technical note: BOJ. Hide And Sick(4) (13913).
BOJ. LCS 2 (9252)
Archived technical note: BOJ. LCS 2 (9252).
BOJ. Longest Increasing Subsequence(5) (14003)
Archived technical note: BOJ. Longest Increasing Subsequence(5) (14003).
BOJ. Longest Increasing Subsequence(4) (14002)
Archived technical note: BOJ. Longest Increasing Subsequence(4) (14002).
BOJ. Make into 1(2) (12852)
Archived technical note: BOJ. Make into 1(2) (12852).
BOJ. Iterate Tree (2263)
Archived technical note: BOJ. Iterate Tree (2263).
BOJ. Bubble Sort (1517)
Archived technical note: BOJ. Bubble Sort (1517).
BOJ. Tree Iteration (1991)
Archived technical note: BOJ. Tree Iteration (1991).
BOJ. Diameter of Tree (1967)
Archived technical note: BOJ. Diameter of Tree (1967).
BOJ. Diameter of Tree (1167)
Archived technical note: BOJ. Diameter of Tree (1167).
BOJ. Find Parent In Tree (11725)
Archived technical note: BOJ. Find Parent In Tree (11725).
BOJ. Maximum and Minimum Values (2357)
Archived technical note: BOJ. Maximum and Minimum Values (2357).
BOJ. Binary Search Tree (5639)
Archived technical note: BOJ. Binary Search Tree (5639).
BOJ. Cycle game (20040)
Archived technical note: BOJ. Cycle game (20040).
LeetCode. 131. Palindrome Partitioning
Archived technical note: LeetCode. 131. Palindrome Partitioning.
BOJ. Friend Network (4195)
Archived technical note: BOJ. Friend Network (4195).
BOJ. Let's go on a trip (1976)
Archived technical note: BOJ. Let's go on a trip (1976).
BOJ. Merge Files (11066)
Archived technical note: BOJ. Merge Files (11066).
BOJ. Exercise (1956)
Archived technical note: BOJ. Exercise (1956).
BOJ. KCM Travel (10217)
Archived technical note: BOJ. KCM Travel (10217).
BOJ. Floyd (11404)
Archived technical note: BOJ. Floyd (11404).
LeetCode. 997. Find the Town Judge
Archived technical note: LeetCode. 997. Find the Town Judge.
BOJ. Time Machine (11657)
Archived technical note: BOJ. Time Machine (11657).
BOJ. Unidentified destination (9370)
Archived technical note: BOJ. Unidentified destination (9370).
LeetCode. 312. Burst Balloons
Archived technical note: LeetCode. 312. Burst Balloons.
BOJ. Shortest path with specification (1504)
Archived technical note: BOJ. Shortest path with specification (1504).
BOJ. Prefix Product (11505)
Archived technical note: BOJ. Prefix Product (11505).
BOJ. Shortest Path (1753)
Archived technical note: BOJ. Shortest Path (1753).
Programmers. Network
Archived technical note: Programmers. Network.
BOJ. Bipartite Graph (1707)
Archived technical note: BOJ. Bipartite Graph (1707).
BOJ. Move the Knight (7562)
Archived technical note: BOJ. Move the Knight (7562).
LeetCode. 40. Combination Sum II
Archived technical note: LeetCode. 40. Combination Sum II.
AtCoder. 020 Log Inequality(3)
Archived technical note: AtCoder. 020 Log Inequality(3).
AtCoder. 018 Statue of Chokudai(3)
Archived technical note: AtCoder. 018 Statue of Chokudai(3).
AtCoder. 014 We Used to Sing a Song Together(3)
Archived technical note: AtCoder. 014 We Used to Sing a Song Together(3).
AtCoder. 015 Don't be too close(6)
Archived technical note: AtCoder. 015 Don't be too close(6).
AtCoder. 016 Minimum Coins(3)
Archived technical note: AtCoder. 016 Minimum Coins(3).
AtCoder. 013 Passing(5)
Archived technical note: AtCoder. 013 Passing(5).
AtCoder. 009 Three Point Angle(6)
Archived technical note: AtCoder. 009 Three Point Angle(6).
AtCoder. 010 Score Sum Queries(2)
Archived technical note: AtCoder. 010 Score Sum Queries(2).
AtCoder. 011 Gravy Jobs(6)
Archived technical note: AtCoder. 011 Gravy Jobs(6).
AtCoder. 012 Red Painting(4)
Archived technical note: AtCoder. 012 Red Painting(4).
AtCoder. 008 AtCounter(4)
Archived technical note: AtCoder. 008 AtCounter(4).
AtCoder. 007 CP Classes(3)
Archived technical note: AtCoder. 007 CP Classes(3).
AtCoder. 006 Smallest Subsequence(5)
Archived technical note: AtCoder. 006 Smallest Subsequence(5).
AtCoder. 005 Restricted Digits(7)
Archived technical note: AtCoder. 005 Restricted Digits(7).
AtCoder. 004 Cross Sum(2)
Archived technical note: AtCoder. 004 Cross Sum(2).
AtCoder. 001 Yokan Party(4)
Archived technical note: AtCoder. 001 Yokan Party(4).
AtCoder. 002 Encyclopedia of Parentheses(3)
Archived technical note: AtCoder. 002 Encyclopedia of Parentheses(3).
AtCoder. 003 Longest Circular Road(4)
Archived technical note: AtCoder. 003 Longest Circular Road(4).
BOJ. Expression of Set (1717)
Archived technical note: BOJ. Expression of Set (1717).
LeetCode. 39. Combination Sum
Archived technical note: LeetCode. 39. Combination Sum.
BOJ. Move and break wall (2206)
Archived technical note: BOJ. Move and break wall (2206).
BOJ. Prefix sum (2042)
Archived technical note: BOJ. Prefix sum (2042).
BOJ. Hide and Seek (1697)
Archived technical note: BOJ. Hide and Seek (1697).
Programmers. Find number of animals with same name
Archived technical note: Programmers. Find number of animals with same name.
Programmers — Largest Number
Archived technical note: Programmers — Largest Number.
LeetCode. 38. Count and Say
Archived technical note: LeetCode. 38. Count and Say.
BOJ. Tomato (7569)
Archived technical note: BOJ. Tomato (7569).
LeetCode. 37. Sudoku Solver
Archived technical note: LeetCode. 37. Sudoku Solver.
LeetCode. 36. Valid Sudoku
Archived technical note: LeetCode. 36. Valid Sudoku.
BOJ. Tell Median Value (1655)
Archived technical note: BOJ. Tell Median Value (1655).
LeetCode. 33. Search in Rotated Sorted Array
Archived technical note: LeetCode. 33. Search in Rotated Sorted Array.
LeetCode. 34. Find First and Last Position of Element in Sorted Array
Archived technical note: LeetCode. 34. Find First and Last Position of Element in Sorted Array.
LeetCode. 32. Longest Valid Parentheses
Archived technical note: LeetCode. 32. Longest Valid Parentheses.
BOJ. Maximum heap (11279)
Archived technical note: BOJ. Maximum heap (11279).
Codility. ArrayInversionCount
Archived technical note: Codility. ArrayInversionCount.
LeetCode. 35. Search Insert Position
Archived technical note: LeetCode. 35. Search Insert Position.
LeetCode. 31. Next Permutation
Archived technical note: LeetCode. 31. Next Permutation.
LeetCode. 30. Substring with Concatenation of All Words
Archived technical note: LeetCode. 30. Substring with Concatenation of All Words.
LeetCode. 29. Divide Two Integers
Archived technical note: LeetCode. 29. Divide Two Integers.
Programmers. Stock Price
Archived technical note: Programmers. Stock Price.
Programmers. Disk Controller
Archived technical note: Programmers. Disk Controller.
BOJ. Closest two Point (2261)
Archived technical note: BOJ. Closest two Point (2261).
LeetCode. 28. Implement strStr()
Archived technical note: LeetCode. 28. Implement strStr().
LeetCode. 27. Remove Element
Archived technical note: LeetCode. 27. Remove Element.
LeetCode. 26. Remove Duplicates from Sorted Array
Archived technical note: LeetCode. 26. Remove Duplicates from Sorted Array.
BOJ. Bigest square in histogram (6549)
Archived technical note: BOJ. Bigest square in histogram (6549).
LeetCode. 25. Reverse Nodes in k-Group
Archived technical note: LeetCode. 25. Reverse Nodes in k-Group.
LeetCode. 24. Swap Nodes in Pairs
Archived technical note: LeetCode. 24. Swap Nodes in Pairs.
LeetCode. 23. Merge k Sorted Lists
Archived technical note: LeetCode. 23. Merge k Sorted Lists.
LeetCode. 21. Merge Two Sorted Lists
Archived technical note: LeetCode. 21. Merge Two Sorted Lists.
LeetCode. 10. Regular Expression Matching
Archived technical note: LeetCode. 10. Regular Expression Matching.
LeetCode. 17. Letter Combinations of a Phone Number
Archived technical note: LeetCode. 17. Letter Combinations of a Phone Number.
LeetCode. 20. Valid Parentheses
Archived technical note: LeetCode. 20. Valid Parentheses.
AtCoder Typical 90 021 — Come Back in One Piece
Archived technical note: AtCoder Typical 90 021 — Come Back in One Piece.
Graph theory. Strongly Connected Components (SCCs)
Understand strongly connected components and Tarjan’s index, low-link, and active-stack invariants, with a worked graph and implementation.
LeetCode. 19. Remove Nth Node From End of List
Archived technical note: LeetCode. 19. Remove Nth Node From End of List.
LeetCode. 1. Two Sum
Archived technical note: LeetCode. 1. Two Sum.
LeetCode. 461. Hamming Distance
Archived technical note: LeetCode. 461. Hamming Distance.
LeetCode. 540. Single Element in a Sorted Array
Archived technical note: LeetCode. 540. Single Element in a Sorted Array.
LeetCode 94. Binary Tree Inorder Traversal
Archived technical note: LeetCode 94. Binary Tree Inorder Traversal.
BOJ 11659 — Range Sum Query 4
Archived technical note: BOJ 11659 — Range Sum Query 4.
LeetCode. 53. Maximum Subarray
Archived technical note: LeetCode. 53. Maximum Subarray.
LeetCode. 13. Roman to Integer
Archived technical note: LeetCode. 13. Roman to Integer.
LeetCode. 83. Remove Duplicates from Sorted List
Archived technical note: LeetCode. 83. Remove Duplicates from Sorted List.
AtCoder. 019 Pick Two(6)
Archived technical note: AtCoder. 019 Pick Two(6).
Contact
Archived technical note: Contact.
LeetCode. 14. Longest Common Prefix
Archived technical note: LeetCode. 14. Longest Common Prefix.
LeetCode. 11. Container With Most Water
Archived technical note: LeetCode. 11. Container With Most Water.
LeetCode. 12.Integer to Roman
Archived technical note: LeetCode. 12.Integer to Roman.
LeetCode. 15. 3Sum
Archived technical note: LeetCode. 15. 3Sum.
LeetCode. 16. 3Sum Closest
Archived technical note: LeetCode. 16. 3Sum Closest.
LeetCode. 3. Longest Substring Without Repeating Characters
Archived technical note: LeetCode. 3. Longest Substring Without Repeating Characters.
LeetCode. 4 Median of Two Sorted Arrays
Archived technical note: LeetCode. 4 Median of Two Sorted Arrays.
LeetCode. 5. Longest Palindromic Substring
Archived technical note: LeetCode. 5. Longest Palindromic Substring.
LeetCode. 6. ZigZag Conversion
Archived technical note: LeetCode. 6. ZigZag Conversion.
LeetCode. 7. Reverse Integer
Archived technical note: LeetCode. 7. Reverse Integer.
LeetCode. 9. Palindrome Number
Archived technical note: LeetCode. 9. Palindrome Number.
Radix Sort
A stable least-significant-digit radix sort for nonnegative safe integers, with input validation, complexity, and edge-case behavior.
BOJ. Tree (4803)
Archived technical note: BOJ. Tree (4803).