CSES Problem Set

Source: cses.fi/problemset Total Problems: 300+

The CSES Problem Set is a collection of algorithmic programming problems maintained by the University of Helsinki. It covers a wide range of topics in competitive programming.

📊 Progress

CSES Problems Solved

Introductory Problems (19)

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

Sorting and Searching (35)

# Problem Link
1 Distinct Numbers cses.fi/1621
2 Apartments cses.fi/1084
3 Ferris Wheel cses.fi/1090
4 Concert Tickets cses.fi/1091
5 Restaurant Customers cses.fi/1619
6 Movie Festival cses.fi/1629
7 Sum of Two Values cses.fi/1640
8 Maximum Subarray Sum cses.fi/1643
9 Stick Lengths cses.fi/1074
10 Missing Coin Sum cses.fi/2183
11 Collecting Numbers cses.fi/2216
12 Collecting Numbers II cses.fi/2217
13 Playlist cses.fi/1141
14 Towers cses.fi/1073
15 Traffic Lights cses.fi/1163
16 Josephus Problem I cses.fi/2162
17 Josephus Problem II cses.fi/2163
18 Nearest Smaller Values cses.fi/1645
19 Subarray Sums I cses.fi/1660
20 Subarray Sums II cses.fi/1661
21 Subarray Divisibility cses.fi/1662
22 Array Division cses.fi/1085
23 Sliding Window Median cses.fi/1076
24 Sliding Window Cost cses.fi/1077
25 Movie Festival II cses.fi/1632
26 Maximum Subarray Sum II cses.fi/1644
27 Subarray Distinct Values cses.fi/2428
28 Array Description cses.fi/1744
29 Factory Machines cses.fi/1620
30 Tasks and Deadlines cses.fi/1631
31 Reading Books cses.fi/1631
32 Creating Strings cses.fi/1622
33 Apple Division cses.fi/1623
34 Grid Paths cses.fi/1625
35 Palindrome Reorder cses.fi/1755

Dynamic Programming (19)

# Problem Link
1 Dice Combinations cses.fi/1633
2 Minimizing Coins cses.fi/1634
3 Coin Combinations I cses.fi/1635
4 Coin Combinations II cses.fi/1636
5 Removing Digits cses.fi/1637
6 Grid Paths cses.fi/1638
7 Book Shop cses.fi/1158
8 Array Description cses.fi/1746
9 Counting Towers cses.fi/2413
10 Edit Distance cses.fi/1639
11 Rectangle Cutting cses.fi/1744
12 Money Sums cses.fi/1745
13 Removal Game cses.fi/1097
14 Two Sets II cses.fi/1093
15 Increasing Subsequence cses.fi/1145
16 Projects cses.fi/1140
17 Elevator Rides cses.fi/1653
18 Counting Tilings cses.fi/2181
19 Graph Paths I cses.fi/1723

Graph Algorithms (36)

# Problem Link
1 Counting Rooms cses.fi/1192
2 Labyrinth cses.fi/1193
3 Building Roads cses.fi/1194
4 Message Route cses.fi/1667
5 Building Teams cses.fi/1668
6 Round Trip cses.fi/1669
7 Monsters cses.fi/1195
8 Shortest Routes I cses.fi/1671
9 Shortest Routes II cses.fi/1672
10 High Score cses.fi/1673
11 Flight Discount cses.fi/1675
12 Cycle Finding cses.fi/1197
13 Flight Routes cses.fi/1674
14 Road Reparation cses.fi/1675
15 Road Construction cses.fi/1676
16 Flight Routes Check cses.fi/1682
17 Planets and Kingdoms cses.fi/1683
18 Giant Pizza cses.fi/1684
19 Coin Collector cses.fi/1686
20 Mail Delivery cses.fi/1693
21 De Bruijn Sequence cses.fi/1692
22 Knight Moves cses.fi/1694
23 Book Shop cses.fi/1158
24 Array Description cses.fi/1746
25 Projects cses.fi/1140
26 Elevator Rides cses.fi/1653
27 Counting Tilings cses.fi/2181
28 Course Schedule cses.fi/1679
29 Longest Flight Route cses.fi/1680
30 Game Routes cses.fi/1681
31 Investigation cses.fi/1202
32 Planets Queries I cses.fi/1750
33 Planets Queries II cses.fi/1160
34 Planets Cycles cses.fi/1751
35 Road Reparation cses.fi/1675
36 Road Construction cses.fi/1676

Tree Algorithms (16)

# Problem Link
1 Tree Diameter cses.fi/1131
2 Tree Distances I cses.fi/1132
3 Tree Distances II cses.fi/1133
4 Company Queries I cses.fi/1687
5 Company Queries II cses.fi/1688
6 Distance Queries cses.fi/1135
7 Counting Paths cses.fi/1136
8 Subtree Queries cses.fi/1137
9 Path Queries cses.fi/1138
10 Path Queries II cses.fi/2134
11 Distinct Colors cses.fi/1139
12 Finding a Centroid cses.fi/2079
13 Fixed-Length Paths I cses.fi/2080
14 Fixed-Length Paths II cses.fi/2081
15 Tree Isomorphism I cses.fi/2130
16 Tree Isomorphism II cses.fi/2131

Mathematics (31)

# Problem Link
1 Josephus Queries cses.fi/2164
2 Exponentiation cses.fi/1095
3 Exponentiation II cses.fi/1712
4 Counting Divisors cses.fi/1713
5 Common Divisors cses.fi/1081
6 Sum of Divisors cses.fi/1082
7 Divisor Analysis cses.fi/2182
8 Prime Multiples cses.fi/2185
9 Counting Coprime Pairs cses.fi/2417
10 Binomial Coefficients cses.fi/1079
11 Creating Strings II cses.fi/1715
12 Distributing Apples cses.fi/1716
13 Christmas Party cses.fi/1717
14 Fibonacci Numbers cses.fi/1722
15 Throwing Dice cses.fi/1096
16 Graph Paths II cses.fi/1724
17 Dice Probability cses.fi/1725
18 Moving Robots cses.fi/1726
19 Candy Lottery cses.fi/1727
20 Missing Coin Sum cses.fi/2183

String Algorithms (17)

# Problem Link
1 Word Combinations cses.fi/1731
2 String Matching cses.fi/1753
3 Finding Borders cses.fi/1732
4 Finding Periods cses.fi/1733
5 Minimal Rotation cses.fi/1110
6 Longest Palindrome cses.fi/1111
7 Required Substring cses.fi/1112
8 Palindrome Queries cses.fi/2420
9 String Transform cses.fi/2421
10 Substring Order I cses.fi/2108
11 Substring Order II cses.fi/2109
12 Substring Distribution cses.fi/2110
13 Counting Patterns cses.fi/2210
14 Pattern Positions cses.fi/2104
15 Distinct Substrings cses.fi/2105
16 Repeating Substring cses.fi/2106
17 String Removal cses.fi/2107

Additional Topics (50+)

The CSES Problem Set also covers:

📁 Solutions

Solutions are available in the repo at:

Last updated: May 2026

Sources