Range Sorting (Hard Version)

binary search, data structures, dp, greedy

Two Merged Sequences

dp, greedy

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Make It Connected

binary search, brute force, constructive algorithms, dsu, graphs, greedy, matrices, trees, two pointers

Expected Damage

binary search, combinatorics, probabilities

Korney Korneevich and XOR (hard version)

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

Too Many Impostors (hard version)

constructive algorithms, implementation, interactive, math

GCD Counting

divide and conquer, dp, dsu, number theory, trees

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Great Grids

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

String Set Queries

brute force, data structures, hashing, interactive, string suffix structures, strings

The Beach

constructive algorithms, dfs and similar, graphs, shortest paths

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Chopping Carrots (Hard Version)

brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers

Maximize Mex

flows, graph matchings, graphs

Arthur and Walls

constructive algorithms, data structures, graphs, greedy, shortest paths

Network Coverage

binary search, constructive algorithms, data structures, greedy

Lucky Array

data structures

Tournament

brute force, dp, greedy

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

Long Way Home

data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths

Fair Share

constructive algorithms, data structures, dfs and similar, graph matchings, graphs

Graph Transpositions

dfs and similar, graphs, greedy, shortest paths

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

Jamie and Tree

data structures, trees

Bored Bakry

bitmasks, greedy, math, two pointers

Prefix Enlightenment

dfs and similar, dsu, graphs

Tree Destruction

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

Black and White Tree

dfs and similar, greedy, trees

Tonya and Burenka-179

data structures, greedy, math, number theory

Cross Swapping

2-sat, data structures, dsu, greedy, matrices

Session in BSU

binary search, dfs and similar, dsu, graph matchings, graphs

Flipping Range

constructive algorithms, dp, greedy, number theory

Hyperregular Bracket Strings

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

Drazil Likes Heap

constructive algorithms, data structures, greedy, implementation

Walk the Runway

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

Intersection of Permutations

data structures

Prime Gift

binary search, dfs and similar, math, meet-in-the-middle, number theory, two pointers

Reverse and Swap

binary search, bitmasks, data structures

Useful Edges

graphs, shortest paths

Sum Balance

bitmasks, dfs and similar, dp, graphs

The Untended Antiquity

data structures, hashing

Half Queen Cover

constructive algorithms, math

Wrong Answer on test 233 (Hard Version)

combinatorics, math

FTL

binary search, dp

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Cooperative Game

constructive algorithms, interactive, number theory

Flying Sort (Hard Version)

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

Vika and Wiki

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

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Plan of Lectures

constructive algorithms, dfs and similar, dsu, graphs, implementation, sortings, trees

Konrad and Company Evaluation

graphs

Four Points

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

Ina of the Mountain

data structures, dp, greedy, math

Road to 1600

brute force, constructive algorithms

Covered Points

fft, geometry, number theory

Chaotic Merge

combinatorics, dp, math, strings

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

Ehab and a component choosing problem

dp, greedy, math, trees

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

The Fox and the Complete Tree Traversal

constructive algorithms, dp, implementation, math, trees

DFS Trees

dfs and similar, dsu, graphs, greedy, sortings, trees

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

Palindromes in a Tree

bitmasks, data structures, divide and conquer, trees

Lucky Tickets

divide and conquer, dp, fft

Balance (Hard version)

brute force, data structures, number theory

Relatively Prime Powers

combinatorics, math, number theory

Linear Kingdom Races

data structures, dp

Routing

bitmasks, brute force, dfs and similar, dp, graphs

The Hidden Pair (Easy Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

Split the Tree

binary search, data structures, dp, greedy, trees

New Year and Rainbow Roads

graphs, greedy, implementation

Dominoes

combinatorics, fft, graphs, math, number theory

Bracket Cost

binary search, data structures, divide and conquer, dp, greedy, strings

Almost Perfect

combinatorics, fft, math

Little Elephant and Inversions

data structures, two pointers

RBS

binary search, bitmasks, brute force, data structures, dp

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

Levels and Regions

dp

String Compression

dp, hashing, string suffix structures, strings

Divisors and Table

brute force, dfs and similar, dp, number theory

Josuke and Complete Graph

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

Fast Travel Text Editor

data structures, dfs and similar, graphs, shortest paths

Koxia and Tree

combinatorics, dfs and similar, dp, dsu, math, probabilities, trees

Simple Skewness

binary search, math, ternary search

Forbidden Indices

dsu, string suffix structures, strings

Animal Observation (hard version)

data structures, dp, greedy

LRU

bitmasks, dp, math, probabilities

The Struggling Contestant

constructive algorithms, greedy

Sasha and Interesting Fact from Graph Theory

brute force, combinatorics, dp, math, trees

Running in Pairs

constructive algorithms, greedy, math

Balanced Binary Search Trees

dp, math

Ideal Farm

constructive algorithms, math

Cyclic Shifts Sorting

brute force, constructive algorithms, implementation, sortings

Madhouse (Easy version)

brute force, constructive algorithms, interactive, math

Trucks and Cities

binary search, dp

Diameter Cuts

combinatorics, dfs and similar, dp, trees

Leaf Sets

data structures, dfs and similar, dsu, graphs, greedy, sortings, trees

Restore the Permutation by Sorted Segments

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

Good Subarrays (Hard Version)

binary search, data structures, dp, two pointers