Knitting Batik

implementation, math

Jeopardy of Dropped Balls

binary search, brute force, dsu, implementation

Coloring

combinatorics, constructive algorithms, implementation, math

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Book

binary search, brute force, data structures, dp, graphs, implementation, sortings

Sweepstake

*special problem, brute force, constructive algorithms, implementation, math

Rhyme

*special problem, implementation

Playoff Restoration

bitmasks, brute force, hashing, implementation, meet-in-the-middle

Inconvenient Pairs

binary search, data structures, implementation, sortings, two pointers

Balanced Substring

implementation

One-Four Overload

2-sat, constructive algorithms, dfs and similar, dsu, graphs, implementation

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

Domino Disaster

implementation, strings

Four Vertices

constructive algorithms, data structures, graphs, greedy, implementation, shortest paths

Points Movement

data structures, dp, greedy, implementation, sortings

Seating Arrangements (hard version)

data structures, greedy, implementation, sortings, two pointers

Scenes From a Memory

brute force, constructive algorithms, implementation, math, number theory

Simply Strange Sort

brute force, implementation, sortings

Polycarp and String Transformation

binary search, implementation, sortings, strings

Infinity Table

implementation, math

Dislike of Threes

implementation

Compressed Bracket Sequence

brute force, implementation

Take Your Places!

implementation

Coin Rows

brute force, constructive algorithms, dp, implementation

Mikasa

binary search, bitmasks, greedy, implementation

Reverse String

brute force, dp, hashing, implementation, strings

Domino (hard version)

constructive algorithms, implementation, math

Excellent Arrays

binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers

Manhattan Subarrays

brute force, geometry, greedy, implementation

Gregor and the Pawn Game

dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation

Air Conditioners

data structures, dp, implementation, shortest paths, sortings, two pointers

Alphabetical Strings

greedy, implementation, strings

Shortest Path with Obstacle

implementation, math

Need for Pink Slips

bitmasks, brute force, dfs and similar, implementation, math, probabilities

Priority Queue

combinatorics, dp, implementation, math, ternary search

Pleasant Pairs

brute force, implementation, math, number theory

Pretty Permutations

constructive algorithms, greedy, implementation

Game with Cards

binary search, constructive algorithms, data structures, dp, greedy, implementation

PriceFixed

binary search, greedy, implementation, sortings, two pointers

Love Song

dp, implementation, strings

Funny Substrings

data structures, hashing, implementation, matrices, strings

Erase and Extend (Easy Version)

binary search, brute force, dp, greedy, hashing, implementation, string suffix structures, strings, two pointers

Challenging Cliffs

constructive algorithms, greedy, implementation, math

Omkar and Medians

data structures, greedy, implementation

String Distance

binary search, brute force, data structures, hashing, implementation, strings

Playoff Tournament

data structures, dfs and similar, dp, implementation, trees

Unstable String

binary search, dp, greedy, implementation, strings, two pointers

Fair Playoff

brute force, implementation

Histogram Ugliness

greedy, implementation, math

Colour the Flag

brute force, implementation

Sweets

*special problem, data structures, implementation

Nearest Point Function

*special problem, implementation

Travel to Bertown

*special problem, implementation, math

Uniform String

*special problem, implementation

Зингер | color

*special problem, implementation

Putting Plates

constructive algorithms, implementation

MEX Tree

combinatorics, dfs and similar, implementation, math, trees

Sequence Pair Weight

hashing, implementation, math

Robot Collisions

data structures, greedy, implementation, sortings

Compression and Expansion

brute force, data structures, greedy, implementation, trees

Game of Life

implementation

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

To Go Or Not To Go?

brute force, dfs and similar, graphs, greedy, implementation, shortest paths

Do Not Be Distracted!

brute force, implementation

Maximum Sum of Products

brute force, dp, implementation, math, two pointers

Group Photo

binary search, data structures, implementation, two pointers

Fillomino 2

constructive algorithms, dfs and similar, greedy, implementation

Cut and Stick

binary search, data structures, greedy, implementation, sortings

Array and Peaks

constructive algorithms, implementation

Education

brute force, dp, greedy, implementation

A-B Palindrome

constructive algorithms, implementation, strings

Almost Rectangle

implementation

Spy Detected!

brute force, implementation

Yet Another Card Deck

brute force, data structures, implementation, trees

King's Task

brute force, graphs, implementation

Almost Sorted

binary search, combinatorics, constructive algorithms, implementation

Binary Literature

constructive algorithms, greedy, implementation, strings, two pointers

Restoring the Permutation

constructive algorithms, implementation

Double-ended Strings

brute force, implementation, strings

Partial Replacement

greedy, implementation

Encoded message

*special problem, implementation

Cakewalk

*special problem, greedy, implementation, shortest paths

Fibonacci Words

*special problem, implementation

DMCA

*special problem, implementation, number theory

Is it rated - 2

*special problem, implementation, interactive

Flip the Bits

constructive algorithms, greedy, implementation, math

Balance the Cards

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation

Napoleon Cake

dp, implementation, sortings

Alexey and Train

implementation

Going Home

brute force, hashing, implementation, math

Binary Removals

brute force, dp, greedy, implementation

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

Qingshan and Daniel

brute force, data structures, greedy, implementation

Delete The Edges

brute force, constructive algorithms, dfs and similar, graphs, implementation

1D Sokoban

binary search, dp, greedy, implementation, two pointers

Berland Crossword

bitmasks, brute force, greedy, implementation

ABC String

bitmasks, brute force, implementation

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

Planet Lapituletti

brute force, implementation

Almost Fault-Tolerant Database

brute force, constructive algorithms, dfs and similar, greedy, implementation