Coffee Break

data structures, greedy, math

Secret Message

constructive algorithms, dfs and similar, math

Formation

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

Another Exercise on Graphs (hard version)

binary search, dfs and similar, dp, dsu, graphs, shortest paths, sortings

Another Exercise on Graphs (Easy Version)

binary search, brute force, dp, dsu, graphs, shortest paths, sortings

Gifts Order

data structures, greedy, implementation, math, matrices

Trip to the Olympiad

bitmasks, constructive algorithms, greedy, math

Affectionate Arrays (Hard Version)

data structures, dp, graphs, greedy, math, shortest paths, two pointers

Affectionate Arrays (Easy Version)

data structures, dp, greedy

Delicate Anti-monotonous Operations

constructive algorithms, implementation

Naive String Splits

binary search, brute force, greedy, hashing, math, number theory, strings

Earnest Matrix Complement

brute force, data structures, dp, greedy, implementation, math

Resourceful Caterpillar Sequence

dfs and similar, dp, games, graphs, greedy, trees

Refined Product Optimality

binary search, data structures, greedy, math, schedules, sortings

Bewitching Stargazer

bitmasks, divide and conquer, dp, math

Managing Cluster

dp, graphs, math, trees

Legacy Screensaver

Knowns and Unknowns

Judicious Watching

binary search, greedy, sortings

Incompetent Delivery Guy

graphs, shortest paths

Hunting Hoglins in Hogwarts

interactive

Geometric Balance

data structures, geometry, implementation

Fix Flooded Floor

constructive algorithms, dp, graphs

Expression Correction

brute force, expression parsing, strings

DAG Serialization

brute force, graphs

Cactus without Bridges

constructive algorithms, math

BitBitJump

Adrenaline Rush

constructive algorithms

Snakes

bitmasks, dp, dsu, graphs

Joker

brute force, greedy, implementation, math

Best Price

binary search, brute force, data structures, greedy, sortings

Tree Destruction

dfs and similar, dp, trees

Maximum modulo equality

data structures, divide and conquer, math, number theory

Three Strings

dp, implementation, strings

MEX OR Mania

bitmasks, brute force, data structures, dsu, implementation

Broken Queries

binary search, bitmasks, brute force, constructive algorithms, implementation, interactive

Shift + Esc

brute force, dp

MEX Cycle

brute force, constructive algorithms, greedy, implementation

Kevin and Puzzle (Hard Version)

bitmasks, fft, math

Kevin and Puzzle (Easy Version)

constructive algorithms

Kevin and Strange Operation

data structures, dp

Kevin and Matrices

brute force, combinatorics, dp, math

Kevin and Math Class

brute force, data structures, divide and conquer, dp, implementation, math, trees

Kevin and Bipartite Graph

constructive algorithms, graphs, greedy

Kevin and Competition Memories

binary search, brute force, data structures, greedy, sortings, two pointers

Yandex Cuneiform (Hard Version)

constructive algorithms, data structures, greedy, implementation

Yandex Cuneiform (Easy Version)

constructive algorithms, data structures, greedy

Cheops and a Contest (Hard Version)

greedy, implementation

Cheops and a Contest (Easy Version)

constructive algorithms, greedy

For the Emperor!

flows, graphs

Adventurers

binary search, data structures, greedy, sortings, ternary search, two pointers

Move Back at a Cost

binary search, data structures, greedy, sortings

Mirror Maze

brute force, dfs and similar, graphs, implementation

Buggy DFS

constructive algorithms

GCDDCG

Xorderable Array

bitmasks, data structures

Microwavable Subsequence

data structures

Missing Separators

dp, sortings, string suffix structures, strings

X Aura

graphs, math, shortest paths

Grid Game 3-angle

games, math

Narrower Passageway

combinatorics, data structures

Aquatic Dragon

Saraga

greedy, strings

ICPC Square

math, number theory

Scrambled Scrabble

brute force, greedy

Hard Demon Problem

constructive algorithms, data structures, dp, implementation, math

Medium Demon Problem (hard version)

dfs and similar, dp, dsu, graphs, implementation, trees

Medium Demon Problem (easy version)

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

Easy Demon Problem

binary search, brute force, data structures, math, number theory

Problem with Queries

brute force, data structures, implementation

Nim

bitmasks, brute force, combinatorics, dp, games, greedy, implementation, shortest paths

Matrix Transformation

bitmasks, brute force, data structures, dfs and similar, graphs, greedy, implementation

Problem about GCD

brute force, flows, math, number theory

Sums on Segments

binary search, brute force, data structures, dp, greedy, math

Two Subarrays

data structures, dp, implementation, matrices

Vertex Pairs

binary search, brute force, data structures, dfs and similar, divide and conquer, greedy, implementation, trees

Recommendations

data structures, implementation, sortings, two pointers

Competitive Fishing

greedy

Railway Construction

Selection Sort

binary search, data structures, greedy, two pointers

Building Castle

Trophic Balance Species

binary search, brute force, dfs and similar, graphs

Bottle Arrangement

data structures, divide and conquer, dp, dsu, greedy

Auto Complete

binary search, data structures, hashing, implementation, sortings, strings, trees

Sheet Music

combinatorics, dp, math

Grid Game

Segmentation Folds

brute force, dfs and similar, number theory

Drunken Maze

brute force, dfs and similar, graphs, shortest paths

Cube

bitmasks, dfs and similar, dp

Number of Cubes

combinatorics, dp, math, number theory

Control of Randomness

combinatorics, dfs and similar, dp, graphs, greedy, math, probabilities, trees

Non Prime Tree

brute force, constructive algorithms, dfs and similar, greedy, number theory, trees, two pointers

Ordered Permutations

bitmasks, combinatorics, constructive algorithms, greedy, math, two pointers

Cool Swap Walk (Hard Version)

constructive algorithms, constructive algorithms, constructive algorithms, implementation, sortings

Cool Swap Walk (Easy Version)

constructive algorithms, implementation, sortings

Shohag Loves Pebae

math, number theory

Shohag Loves Counting (Hard Version)

dp, number theory

Shohag Loves Counting (Easy Version)

combinatorics, dp, math, number theory

Shohag Loves Inversions

combinatorics, dp, implementation, math

Shohag Loves GCD

constructive algorithms, greedy, math, number theory