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CSES-Solutions

Accepted solutions of CSES problemset

Table of Contents

• Introductory Problems
• Sorting and Searching
• Dynamic Programming
• Graph Algorithms
• Range Queries
• Tree Algorithms
• Mathematics
• String Algorithms
• Geometry
• Advanced Techniques
• Additional Problems

Introductory Problems

1. 1068 - Weird Algorithm
2. 1083 - Missing Number
3. 1069 - Repetitions
4. 1094 - Increasing Array
5. 1070 - Permutations
6. 1071 - Number Spiral
7. 1072 - Two Knights
8. 1092 - Two Sets
9. 1617 - Bit Strings
10. 1618 - Trailing Zeros
11. 1754 - Coin Piles
12. 1755 - Palindrome Reorder
13. 2205 - Gray Code
14. 2165 - Tower of Hanoi
15. 1622 - Creating Strings
16. 1623 - Apple Division
17. 1624 - Chessboard and Queens
18. 2431 - Digit Queries
19. 1625 - Grid Paths

Sorting and Searching

1. 1621 - Distinct Numbers
2. 1084 - Apartments
3. 1090 - Ferris Wheel
4. 1091 - Concert Tickets
5. 1619 - Restaurant Customers
6. 1629 - Movie Festival
7. 1640 - Sum of Two Values
8. 1643 - Maximum Subarray Sum
9. 1074 - Stick Lengths
10. 2183 - Missing Coin Sum
11. 2216 - Collecting Numbers
12. 2217 - Collecting Numbers II
13. 1141 - Playlist
14. 1073 - Towers
15. 1163 - Traffic Lights
16. 2162 - Josephus Problem I
17. 2163 - Josephus Problem II
18. 2168 - Nested Ranges Check
19. 2169 - Nested Ranges Count
20. 1164 - Room Allocation
21. 1620 - Factory Machines
22. 1630 - Tasks and Deadlines
23. 1631 - Reading Books
24. 1641 - Sum of Three Values
25. 1642 - Sum of Four Values
26. 1645 - Nearest Smaller Values
27. 1660 - Subarray Sums I
28. 1661 - Subarray Sums II
29. 1662 - Subarray Divisibility
30. 2428 - Subarray Distinct Values
31. 1085 - Array Division
32. 1076 - Sliding Median
33. 1077 - Sliding Cost
34. 1632 - Movie Festival II
35. 1644 - Maximum Subarray Sum II

Dynamic Programming

1. 1633 - Dice Combinations
2. 1634 - Minimizing Coins
3. 1635 - Coin Combinations I
4. 1636 - Coin Combinations II
5. 1637 - Removing Digits
6. 1638 - Grid Paths
7. 1158 - Book Shop
8. 1746 - Array Description
9. 2413 - Counting Towers
10. 1639 - Edit Distance
11. 1744 - Rectangle Cutting
12. 1745 - Money Sums
13. 1097 - Removal Game
14. 1093 - Two Sets II
15. 1145 - Increasing Subsequence
16. 1140 - Projects
17. 1653 - Elevator Rides
18. 2181 - Counting Tilings
19. 2220 - Counting Numbers

Graph Algorithms

1. 1192 - Counting Rooms
2. 1193 - Labyrinth
3. 1666 - Building Roads
4. 1667 - Message Route
5. 1668 - Building Teams
6. 1669 - Round Trip
7. 1194 - Monsters
8. 1671 - Shortest Routes I
9. 1672 - Shortest Routes II
10. 1673 - High Score
11. 1195 - Flight Discount
12. 1197 - Cycle Finding
13. 1196 - Flight Routes
14. 1678 - Round Trip II
15. 1679 - Course Schedule
16. 1680 - Longest Flight Route
17. 1681 - Game Routes
18. 1202 - Investigation
19. 1750 - Planets Queries I
20. 1160 - Planets Queries II
21. 1751 - Planets Cycles
22. 1675 - Road Reparation
23. 1676 - Road Construction
24. 1682 - Flight Routes Check
25. 1683 - Planets and Kingdoms
26. 1684 - Giant Pizza
27. 1686 - Coin Collector
28. 1691 - Mail Delivery
29. 1692 - De Bruijn Sequence
30. 1693 - Teleporters Path
31. 1690 - Hamiltonian Flights
32. 1689 - Knight's Tour
33. 1694 - Download Speed
34. 1695 - Police Chase
35. 1696 - School Dance
36. 1711 - Distinct Routes

Range Queries

1. 1646 - Static Range Sum Queries
2. 1647 - Static Range Minimum Queries
3. 1648 - Dynamic Range Sum Queries
4. 1649 - Dynamic Range Minimum Queries
5. 1650 - Range Xor Queries
6. 1651 - Range Update Queries
7. 1652 - Forest Queries
8. 1143 - Hotel Queries
9. 1749 - List Removals
10. 1144 - Salary Queries
11. 2166 - Prefix Sum Queries
12. 2206 - Pizzeria Queries
13. 1190 - Subarray Sum Queries
14. 1734 - Distinct Values Queries
15. 2416 - Increasing Array Queries
16. 1739 - Forest Queries II
17. 1735 - Range Updates and Sums
18. 1736 - Polynomial Queries
19. 1737 - Range Queries and Copies

Tree Algorithms

1. 1674 - Subordinates
2. 1130 - Tree Matching
3. 1131 - Tree Diameter
4. 1132 - Tree Distances I
5. 1133 - Tree Distances II
6. 1687 - Company Queries I
7. 1688 - Company Queries II
8. 1135 - Distance Queries
9. 1136 - Counting Paths
10. 1137 - Subtree Queries
11. 1138 - Path Queries
12. 2134 - Path Queries II
13. 1139 - Distinct Colors
14. 2079 - Finding a Centroid
15. 2080 - Fixed-Length Paths I
16. 2081 - Fixed-Length Paths II

Mathematics

1. 2164 - Josephus Queries
2. 1095 - Exponentiation
3. 1712 - Exponentiation II
4. 1713 - Counting Divisors
5. 1081 - Common Divisors
6. 1082 - Sum of Divisors
7. 2182 - Divisor Analysis
8. 2185 - Prime Multiples
9. 2417 - Counting Coprime Pairs
10. 1079 - Binomial Coefficients
11. 1715 - Creating Strings II
12. 1716 - Distributing Apples
13. 1717 - Christmas Party
14. 2064 - Bracket Sequences I
15. 2187 - Bracket Sequences II
16. 2209 - Counting Necklaces
17. 2210 - Counting Grids
18. 1722 - Fibonacci Numbers
19. 1096 - Throwing Dice
20. 1723 - Graph Paths I
21. 1724 - Graph Paths II
22. 1725 - Dice Probability
23. 1726 - Moving Robots
24. 1727 - Candy Lottery
25. 1728 - Inversion Probability
26. 1729 - Stick Game
27. 1730 - Nim Game I
28. 1098 - Nim Game II
29. 1099 - Stair Game
30. 2207 - Grundy's Game
31. 2208 - Another Game

String Algorithms

1. 1731 - Word Combinations
2. 1753 - String Matching
3. 1732 - Finding Borders
4. 1733 - Finding Periods
5. 1110 - Minimal Rotation
6. 1111 - Longest Palindrome
7. 1112 - Required Substring
8. 2420 - Palindrome Queries
9. 2102 - Finding Patterns
10. 2103 - Counting Patterns
11. 2104 - Pattern Positions
12. 2105 - Distinct Substrings
13. 2106 - Repeating Substring
14. 2107 - String Functions
15. 2108 - Substring Order I
16. 2109 - Substring Order II
17. 2110 - Substring Distribution

Geometry

1. 2189 - Point Location Test
2. 2190 - Line Segment Intersection
3. 2191 - Polygon Area
4. 2192 - Point in Polygon
5. 2193 - Polygon Lattice Points
6. 2194 - Minimum Euclidean Distance
7. 2195 - Convex Hull

Advanced Techniques

1. 1628 - Meet in the Middle
2. 2136 - Hamming Distance
3. 2137 - Beautiful Subgrids
4. 2138 - Reachable Nodes
5. 2143 - Reachability Queries
6. 2072 - Cut and Paste
7. 2073 - Substring Reversals
8. 2074 - Reversals and Sums
9. 2076 - Necessary Roads
10. 2077 - Necessary Cities
11. 2078 - Eulerian Subgraphs
12. 2084 - Monster Game I
13. 2085 - Monster Game II
14. 2086 - Subarray Squares
15. 2087 - Houses and Schools
16. 2088 - Knuth Division
17. 2111 - Apples and Bananas
18. 2112 - One Bit Positions
19. 2113 - Signal Processing
20. 2101 - New Roads Queries
21. 2133 - Dynamic Connectivity
22. 2121 - Parcel Delivery
23. 2129 - Task Assignment
24. 2130 - Distinct Routes II

Additional Problems

1. 1087 - Shortest Subsequence
2. 1146 - Counting Bits
3. 1670 - Swap Game
4. 1134 - Prüfer Code
5. 1756 - Acyclic Grpah Edges
6. 2177 - Strongly Connected Edges
7. 2179 - Even Outdegree Edges
8. 2422 - Multiplication Table
9. 1142 - Advertisement
10. 2186 - Special Substrings
11. 2229 - Permutation Inversions
12. 1655 - Maximum Xor Subarray
13. 1664 - Movie Festival Queries
14. 1697 - Chess Tournament
15. 1702 - Tree Traversals
16. 1704 - Network Renovation
17. 1707 - Graph Girth
18. 1740 - Intersection Points
19. 2214 - Inverse Inversions
20. 2215 - Monotone Subsequences
21. 1743 - String Reorder
22. 2425 - Stack Weights
23. 1747 - Pyramid Array
24. 1748 - Increasing Subsequence II
25. 1149 - String Removals
26. 1188 - Bit Inversions
27. 2419 - Xor Pyramid
28. 1086 - Writing Numbers
29. 1113 - String Transform
30. 2427 - Letter Pair Move Game
31. 1147 - Maximum Building I
32. 1162 - Sorting Methods
33. 1191 - Cyclic Array
34. 2414 - List of Sums
35. 2132 - Increasing Array II
36. 1189 - Food Division
37. 1654 - Bit Problem
38. 1698 - Swap Round Sorting
39. 2430 - Binary Subsequences
40. 1700 - Tree Isomorphism I
41. 2228 - Counting Sequences
42. 1703 - Critical Cities
43. 1706 - School Excursion
44. 1709 - Coin Grid
45. 1742 - Robot Path
46. 2426 - Programmers and Artists
47. 1757 - Course Schedule II
48. 2174 - Removing Digits II
49. 2180 - Coin Arrangement
50. 2176 - Counting Bishops
51. 2432 - Grid Puzzle I
52. 2131 - Grid Puzzle II
53. 1080 - Empty String
54. 1078 - Grid Paths
55. 2115 - Bit Substrings
56. 2075 - Reversal Sorting
57. 2421 - Counting Reorders
58. 1159 - Book Shop II
59. 1677 - Network Breakdown
60. 1203 - Visiting Cities
61. 2184 - Missing Coin Sum Queries
62. 1157 - Number Grid
63. 1148 - Maximum Building II
64. 2423 - Filling Trominos
65. 1161 - Stick Divisions
66. 1665 - Coding Company
67. 1699 - Flight Route Requests
68. 2402 - Two Stacks Sorting
69. 1701 - Tree Isomorphism II
70. 1705 - Forbidden Cities
71. 1741 - Area of Rectangles
72. 2429 - Grid Completion
73. 1752 - Creating Offices
74. 1075 - Permutations II
75. 2415 - Functional Graph Distribution
76. 1685 - New Flight Routes
77. 2418 - Grid Path Construction