String Generation

constructive algorithms, greedy

Four Points

brute force, constructive algorithms, flows, geometry, greedy, implementation, math, ternary search

Ping-pong

constructive algorithms, games, math

Jumps

constructive algorithms, math

Number into Sequence

constructive algorithms, math, number theory

Special Permutation

constructive algorithms, probabilities

Checkpoints

brute force, constructive algorithms, greedy, math, probabilities

Suffix Operations

constructive algorithms, implementation

Divide Powers

constructive algorithms, greedy

Nullify The Matrix

constructive algorithms, games

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Bitwise Queries (Easy Version)

bitmasks, constructive algorithms, interactive, math

The Struggling Contestant

constructive algorithms, greedy

Capitalism

constructive algorithms, dfs and similar, graphs, shortest paths

Errich-Tac-Toe (Hard Version)

constructive algorithms, math

Errich-Tac-Toe (Easy Version)

constructive algorithms, math

Avoid Trygub

constructive algorithms, sortings

Add Candies

constructive algorithms, math

Long Recovery

constructive algorithms, dfs and similar

Knapsack

constructive algorithms, greedy, sortings

Rectangular Polyline

constructive algorithms, dp, geometry

Kids Seating

constructive algorithms, math

Black, White and Grey Tree

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

Extreme Subtraction

constructive algorithms, dp, greedy

Graph Subset Problem

constructive algorithms, data structures, graphs

Binary Table (Hard Version)

constructive algorithms, graphs, greedy, implementation

Binary Table (Easy Version)

constructive algorithms, implementation

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

Powerful Ksenia

bitmasks, constructive algorithms, math

Engineer Artem

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

Valerii Against Everyone

constructive algorithms, data structures, greedy, sortings

Specific Tastes of Andre

constructive algorithms, implementation

Make It Increasing

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

Reverse Binary Strings

constructive algorithms, greedy

Marketing Scheme

brute force, constructive algorithms, greedy, math

Prime Square

constructive algorithms, math

Districts Connection

constructive algorithms, dfs and similar

Dominant Piranha

constructive algorithms, greedy

Numbers on Whiteboard

constructive algorithms, data structures, greedy, implementation, math

Number of Apartments

brute force, constructive algorithms, math

Bouncing Boomerangs

constructive algorithms, greedy, implementation

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Unshuffling a Deck

constructive algorithms, implementation

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Increase and Copy

binary search, constructive algorithms, math

Huge Boxes of Animal Toys

constructive algorithms

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Hexagons

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

Palindromifier

constructive algorithms, strings

Putting Bricks in the Wall

constructive algorithms, implementation

Pokémon Army (easy version)

constructive algorithms, dp, greedy

Decryption

constructive algorithms, implementation, math, number theory

Sage's Birthday (hard version)

binary search, brute force, constructive algorithms, greedy, sortings, two pointers

Sage's Birthday (easy version)

binary search, constructive algorithms, greedy, sortings

Stairs

brute force, constructive algorithms, greedy, implementation, math

Make Them Equal

constructive algorithms, greedy, math

New Game Plus!

constructive algorithms, greedy, math

XOR-gun

bitmasks, brute force, constructive algorithms

Finding Sasuke

constructive algorithms, math

Two Different

constructive algorithms, divide and conquer

Arrays Sum

constructive algorithms, greedy, math

Circle Coloring

constructive algorithms

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Chocolate Bunny

constructive algorithms, interactive, math, two pointers

Ahahahahahahahaha

constructive algorithms, math

Three Sequences

constructive algorithms, data structures, greedy, math

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Array Cancellation

constructive algorithms, implementation

Permutation Forgery

constructive algorithms

Game of Pairs

constructive algorithms, dfs and similar, interactive, math, number theory

Fixed Point Removal

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

Mere Array

constructive algorithms, math, number theory, sortings

Ternary Sequence

constructive algorithms, greedy, math

Distance and Axis

constructive algorithms, math

Binary String Reconstruction

2-sat, brute force, constructive algorithms, greedy

String Similarity

constructive algorithms, strings

Binary String To Subsequences

constructive algorithms, data structures, greedy, implementation

Distance Matching

constructive algorithms, dfs and similar, trees

Stoned Game

brute force, constructive algorithms, games, greedy

Multiples of Length

constructive algorithms, greedy, number theory

Boboniu Plays Chess

constructive algorithms

Pinkie Pie Eats Patty-cakes

constructive algorithms, greedy, math, sortings

Applejack and Storages

constructive algorithms, data structures, greedy, implementation

Omkar and Landslide

binary search, constructive algorithms, data structures, greedy, math

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Pairs of Pairs

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

505

bitmasks, brute force, constructive algorithms, dp, greedy, implementation

Suborrays

constructive algorithms, math

LCM Problem

constructive algorithms, greedy, math, number theory

Colors

*special problem, binary search, constructive algorithms, interactive

Directing Edges

constructive algorithms, dfs and similar, graphs

Koa and the Beach (Hard Version)

constructive algorithms, dp, greedy, implementation

Common Prefixes

constructive algorithms, greedy, strings

Rearrange

brute force, constructive algorithms, graphs, greedy, sortings

GameGame

bitmasks, constructive algorithms, dp, games, greedy, math

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

Prefix Flip (Hard Version)

constructive algorithms, data structures, implementation, strings, two pointers

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers