Lihmuf Balling

binary search, brute force, math

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

Jackets and Packets

dp

Imagination Castle

dp, games, two pointers

Happy Sets

combinatorics

Grouped Carriages

binary search, data structures, dp, flows, greedy

Freak Joker Process

binary search, data structures, sortings

Elevators of Tamem

dp

Digital Wallet

dp, greedy

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

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

The Great Equalizer

binary search, data structures, math, sortings

Four Suits

binary search, bitmasks, flows, greedy

Non-Intersecting Subpermutations

combinatorics, dp, implementation, math

Evaluate RBS

data structures, geometry, implementation, math, sortings

Fast Travel Text Editor

data structures, dfs and similar, graphs, shortest paths

Balanced String

dp

Teleportation in Byteland

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

Maximum Monogonosity

brute force, dp, math

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

Counting Graphs

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

PermuTree (hard version)

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

More Wrong

divide and conquer, interactive

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

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

Vlad and the Mountains

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

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

Vika and Wiki

binary search, bitmasks, combinatorics, divide and conquer, dp, math

Vika and Stone Skipping

brute force, implementation, math, number theory

Vika and Bonuses

binary search, brute force, math, ternary search

The Boss's Identity

binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings

Triangle Platinum?

brute force, combinatorics, implementation, interactive, math, probabilities

Swimmers in the Pool

dp, fft, math, number theory

Boxes and Balls

dp, implementation, math

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Tree Weights

bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees

Min Cost Permutation (Hard Version)

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

Min Cost Permutation (Easy Version)

brute force, constructive algorithms, greedy, math

Great Grids

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

Omsk Metro (hard version)

data structures, dfs and similar, divide and conquer, dp, math, trees

Tenzing and Necklace

divide and conquer, dp, greedy

Tenzing and Random Real Numbers

bitmasks, dp, graphs, math, probabilities

Tenzing and Random Operations

combinatorics, dp, math, probabilities

Tenzing and Tree

dfs and similar, greedy, shortest paths, sortings, trees

Tenzing and Triangle

data structures, dp, geometry, greedy, math

Monocarp and a Strategic Game

geometry, sortings, two pointers

Fill the Matrix

data structures, greedy, math

Pairs of Segments

data structures, greedy, sortings, two pointers

In Search of Truth (Hard Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

In Search of Truth (Easy Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

Railguns

brute force, dfs and similar, dp, graphs

Decreasing Game

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

Ball Sorting

data structures, dp, sortings

Stuck Conveyor

binary search, constructive algorithms, interactive

Count Supersequences

combinatorics, dp, math

Bracket Walk

data structures, greedy, strings

Editorial for Two

binary search, data structures, greedy, implementation

Playoff Fixing

combinatorics, trees

Good Graph

bitmasks, dfs and similar, graph matchings, graphs, implementation

Old Mobile

combinatorics, dp, probabilities

Doctor's Brown Hypothesis

dfs and similar, graphs, math, number theory

Twin Clusters

bitmasks, brute force, constructive algorithms, math, probabilities

Lottery

binary search, brute force, greedy, math, two pointers

Typewriter

brute force, math

MEX of LCM

binary search, data structures, implementation, math, number theory

Zombies

binary search, dp

Combinatorics Problem

brute force, combinatorics, dp

Red-Blue Operations (Hard Version)

binary search, constructive algorithms, greedy, implementation, math

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

The Third Grace

data structures, dp

Bully Sort

data structures, math

Mex Tree

brute force, dp, trees

Hyperregular Bracket Strings

combinatorics, greedy, hashing, math, number theory, sortings

The BOSS Can Count Pairs

brute force, math

Copium Permutation

constructive algorithms, data structures, greedy

Bus Routes

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

Two Centroids

data structures, dfs and similar, greedy, trees

Palindrome Partition

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

Range Sorting (Hard Version)

binary search, data structures, dp, greedy

Range Sorting (Easy Version)

binary search, dp, dsu, greedy, trees, two pointers

Fading into Fog

geometry, interactive, math, probabilities

Walk the Runway

bitmasks, brute force, data structures, dp, graphs, implementation, sortings