Battling with Numbers

combinatorics, math, number theory

Ambitious Kid

math

Future Dominators

graphs, greedy

Asterism Stream

dp, math, matrices

Magic Square

combinatorics, constructive algorithms, implementation

Exotic Queries

data structures, implementation, sortings

Guess Game

bitmasks, data structures, games, math, probabilities, sortings, strings, trees

Matrix Cascade

brute force, constructive algorithms, data structures, dp, greedy, math

Divisor Chain

bitmasks, constructive algorithms, math, number theory

Swap and Reverse

constructive algorithms, greedy, sortings, strings

Increasing and Decreasing

constructive algorithms, greedy, implementation, math

Redundant Routes

constructive algorithms, dp, trees

Goldberg Machine 3

dp, trees

Swaps

combinatorics, dp, graphs, math

Divide, XOR, and Conquer

bitmasks, dp, math

Speedrun

brute force, dfs and similar, dp, graphs, greedy, math, sortings, two pointers

Two-Colored Dominoes

constructive algorithms, greedy

MEX Repetition

implementation, math

Split Sort

greedy, math, sortings

Channel

greedy, implementation

The Great Equalizer

binary search, data structures, math, sortings

Magic Will Save the World

binary search, bitmasks, brute force, dp

Kolya and Movie Theatre

constructive algorithms, data structures, greedy

Ice Cream Balls

binary search, combinatorics, constructive algorithms, math

Flower City Fence

binary search, data structures, implementation, sortings

Sequence Game

constructive algorithms

Gift Carpet

dp, greedy, implementation, strings

Four Suits

binary search, bitmasks, flows, greedy

Non-Intersecting Subpermutations

combinatorics, dp, implementation, math

Sorting By Multiplication

dp, greedy

Queries for the Array

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

Two Binary Strings

constructive algorithms, dp, greedy

Prime Deletion

constructive algorithms, math

Evaluate RBS

data structures, geometry, implementation, math, sortings

Fast Travel Text Editor

data structures, dfs and similar, graphs, shortest paths

Balanced String

dp

Game on Permutation

data structures, dp, games, greedy

Fancy Coins

binary search, brute force, greedy, math

Not a Substring

constructive algorithms, strings

Teleportation in Byteland

data structures, dfs and similar, divide and conquer, graphs, shortest paths, trees

Maximum Monogonosity

brute force, dp, math

Andrey and Escape from Capygrad

binary search, data structures, dp, dsu, greedy, sortings

Another Permutation Problem

brute force, dp, greedy, math

Olya and Game with Arrays

constructive algorithms, greedy, math, sortings

United We Stand

constructive algorithms, math, number theory

Rollbacks (Hard Version)

data structures, interactive, trees

Rollbacks (Easy Version)

brute force, data structures, dfs and similar, trees

Trees and Segments

brute force, data structures, dp, greedy, two pointers

Yet Another Permutation Problem

constructive algorithms, greedy, math, number theory

The Walkway

brute force, dp, greedy, math, number theory

Buttons

games, greedy, math

Counting Graphs

combinatorics, divide and conquer, dsu, graphs, greedy, sortings, trees

Sum and Product

binary search, data structures, math

Power of Points

math, sortings

Strong Vertices

math, sortings, trees

Assembly via Minimums

greedy, sortings

Maximum Rounding

greedy, implementation, math

Array Coloring

greedy, math

PermuTree (hard version)

bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees

PermuTree (easy version)

dfs and similar, dp, trees

More Wrong

divide and conquer, interactive

To Become Max

binary search, brute force, data structures, dp

Good Arrays

implementation, math

Tales of a Sort

implementation

Longest Divisors Interval

brute force, combinatorics, greedy, math, number theory

Dalton the Teacher

greedy, math

Mark and Spaceship

brute force, dp

Game Bundles

brute force, constructive algorithms, dp, greedy, math

Michael and Hotel

binary search, interactive, trees

Expected Destruction

combinatorics, dp, math, probabilities

Earn or Unlock

bitmasks, brute force, dp

Dual (Hard Version)

constructive algorithms, math

Dual (Easy Version)

constructive algorithms, math

Fibonaccharsis

binary search, brute force, math

Desorting

brute force, greedy, math

Panda Meetups

data structures, dp, flows

Rivalries

constructive algorithms, data structures, greedy

Miriany and Matchstick

constructive algorithms, dp, greedy

Ina of the Mountain

data structures, dp, greedy, math

Imbalanced Arrays

constructive algorithms, graphs, greedy, math, sortings, two pointers

Ntarsis' Set

binary search, math, number theory

Vlad and the Mountains

binary search, data structures, dsu, graphs, implementation, sortings, trees, two pointers

Lisa and the Martians

bitmasks, greedy, math, strings, trees

Nastya and Potions

dfs and similar, dp, graphs, sortings

Prefix Permutation Sums

implementation, math

Tiles Comeback

greedy

Parity Sort

greedy, sortings, two pointers

Escalator Conversations

brute force, constructive algorithms, math

The Third Letter

dfs and similar, dsu, graphs, greedy, implementation

The Morning Star

combinatorics, data structures, geometry, implementation, math, sortings

We Were Both Children

brute force, implementation, math, number theory

Cardboard for Pictures

binary search, geometry, implementation, math

Balanced Round

brute force, greedy, implementation, sortings

Word on the Paper

implementation, strings

Ten Words of Wisdom

implementation, sortings

To My Critics

implementation, sortings

XOR Partition

binary search, bitmasks, data structures, divide and conquer, greedy, trees

Max to the Right of Min

binary search, data structures, divide and conquer, dp, dsu, two pointers

Array Painting

constructive algorithms, greedy, two pointers

Binary String Copying

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