Array Shuffling

constructive algorithms, graphs, greedy

notepad.exe

binary search, constructive algorithms, greedy, interactive

Cyclic Rotation

constructive algorithms, greedy, implementation, two pointers

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

Job Lookup

constructive algorithms, dp, shortest paths, trees

Interactive Treasure Hunt

brute force, constructive algorithms, geometry, interactive, math

Connect the Points

brute force, constructive algorithms, geometry

GCD Guess

bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Reverse Sort Sum

constructive algorithms, data structures, greedy, implementation, math, two pointers

Shinju and the Lost Permutation

constructive algorithms, math

Equal Tree Sums

constructive algorithms, dfs and similar, math, trees

K-good

constructive algorithms, math, number theory

Integral Array

brute force, constructive algorithms, data structures, math

Madoka and the Best School in Russia

constructive algorithms, dp, math, number theory

Weight the Tree

constructive algorithms, dfs and similar, dp, implementation, trees

Repetitions Decoding

constructive algorithms, implementation, sortings

Big Brush

constructive algorithms, data structures, greedy, implementation

Cars

2-sat, constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

Finding Zero

constructive algorithms, interactive, math

Range and Partition

binary search, constructive algorithms, data structures, greedy, two pointers

Interacdive Problem

binary search, constructive algorithms, interactive

Masha-forgetful

brute force, constructive algorithms, dp, hashing, implementation, strings

The Winter Hike

constructive algorithms, greedy, math

Replace the Numbers

constructive algorithms, data structures, dsu, implementation

Exact Change

brute force, constructive algorithms, greedy

Let's Play the Hat?

brute force, constructive algorithms, greedy, math

MEX and Increments

constructive algorithms, data structures, dp, greedy, implementation, math, sortings

Reverse

bitmasks, constructive algorithms, dfs and similar, implementation, math, strings

Singers' Tour

constructive algorithms, math

Too Many Impostors (easy version)

constructive algorithms, implementation, interactive

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

The Number of Imposters

constructive algorithms, dfs and similar, dp, dsu, graphs

Changing Brackets

constructive algorithms, data structures, dp, greedy

Bakry and Partitioning

bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees

Moment of Bloom

constructive algorithms, dfs and similar, graph matchings, graphs, greedy, trees

Omkar and the Meaning of Life

constructive algorithms, greedy, interactive

Kotlinforces

*special problem, constructive algorithms, dp

Sweepstake

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

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

Buds Re-hanging

constructive algorithms, dfs and similar, dp, greedy, trees

Nearest Beautiful Number (hard version)

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy

Nearest Beautiful Number (easy version)

binary search, bitmasks, brute force, constructive algorithms, dfs and similar, greedy

Bottom-Tier Reversals

constructive algorithms, greedy

Take a Guess

bitmasks, constructive algorithms, interactive, math

Diane

constructive algorithms, greedy, strings

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Array Differentiation

bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math

Maximize the Intersections

combinatorics, constructive algorithms, geometry, greedy, sortings

Domino (hard version)

constructive algorithms, implementation, math

Domino (easy version)

constructive algorithms, math

RPD and Rap Sheet (Hard Version)

brute force, constructive algorithms, interactive, math

RPD and Rap Sheet (Easy Version)

bitmasks, constructive algorithms, interactive, math

Another Problem About Dividing Numbers

constructive algorithms, math, number theory

Figure Fixing

constructive algorithms, dfs and similar, dsu, graphs, greedy, math

Lost Tree

constructive algorithms, interactive, trees

Minimax

constructive algorithms, greedy, strings

Palindrome Game (hard version)

constructive algorithms, games

Kill Anton

brute force, constructive algorithms, data structures, math, strings

Nastia and a Hidden Permutation

constructive algorithms, interactive

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Baby Ehab Partitions Again

bitmasks, constructive algorithms, dp, math

GCD and MST

constructive algorithms, dsu, graphs, greedy, number theory, sortings

Almost Sorted

binary search, combinatorics, constructive algorithms, implementation

Binary Literature

constructive algorithms, greedy, implementation, strings, two pointers

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

3-Coloring

constructive algorithms, games, interactive

K-beautiful Strings

binary search, brute force, constructive algorithms, greedy, strings

Genius's Gambit

bitmasks, constructive algorithms, greedy, math

Zookeeper and The Infinite Zoo

bitmasks, constructive algorithms, dp, greedy, math

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

AB Graph

brute force, constructive algorithms, graphs, greedy, implementation

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Painting the Array I

constructive algorithms, data structures, dp, greedy, implementation

Nezzar and Nice Beatmap

constructive algorithms, geometry, greedy, math, sortings

Nezzar and Board

constructive algorithms, math, number theory

Unusual Matrix

2-sat, brute force, constructive algorithms

Array Destruction

brute force, constructive algorithms, data structures, greedy, implementation, sortings

Strange Housing

constructive algorithms, dfs and similar, graph matchings, graphs, greedy

Ceil Divisions

brute force, constructive algorithms, math, number theory

K and Medians

constructive algorithms, greedy, math

Three Bags

constructive algorithms, greedy

Pairs

binary search, constructive algorithms, greedy, two pointers

Checkpoints

brute force, constructive algorithms, greedy, math, probabilities

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

Errich-Tac-Toe (Easy Version)

constructive algorithms, math

Extreme Subtraction

constructive algorithms, dp, greedy

Binary Table (Hard Version)

constructive algorithms, graphs, greedy, implementation

Powerful Ksenia

bitmasks, constructive algorithms, math

Engineer Artem

2-sat, chinese remainder theorem, constructive algorithms, fft, flows

Make It Increasing

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

Bouncing Boomerangs

constructive algorithms, greedy, implementation

Unshuffling a Deck

constructive algorithms, implementation

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Hexagons

brute force, constructive algorithms, greedy, implementation, math, shortest paths

Decryption

constructive algorithms, implementation, math, number theory

Make Them Equal

constructive algorithms, greedy, math

New Game Plus!

constructive algorithms, greedy, math

XOR-gun

bitmasks, brute force, constructive algorithms