Frequency Queries

data structures, dfs and similar, trees

Yet Another Sorting Problem

data structures, math

Minimize Distance

greedy

Array Eversion

greedy

Life of a Flower

implementation

Eligible Segments

geometry

Strange LCS

bitmasks, dp, graphs, greedy, strings

Game with Stones

binary search, data structures, games, greedy

Guess the Permutation

binary search, combinatorics, interactive, math

Two Arrays

greedy, math, sortings

Coloring Rectangles

greedy, math

Mathematical Addition

math

Omkar and Tours

data structures, divide and conquer, sortings, trees

Omkar and Time Travel

data structures, math

Defender of Childhood Dreams

bitmasks, constructive algorithms, divide and conquer

Moment of Bloom

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

Omkar and the Meaning of Life

constructive algorithms, greedy, interactive

Omkar and Determination

data structures, dp

Omkar and Heavenly Tree

constructive algorithms, trees

Windblume Ode

math, number theory

Kuzya and Homework

data structures, number theory

Korney Korneevich and XOR (hard version)

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

Korney Korneevich and XOR (easy version)

bitmasks, dp, greedy

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

Vupsen, Pupsen and 0

constructive algorithms, math

Grandma Capa Knits a Scarf

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

Luntik and Subsequences

combinatorics, math

Luntik and Concerts

math

Diameter of Graph

constructive algorithms, graphs, greedy, math

CQXYM Count Permutations

combinatorics, math, number theory

Problems for Codeforces

combinatorics, fft, math

Railway Construction

brute force, constructive algorithms, data structures, graphs, shortest paths

Subsequence

brute force, divide and conquer, dp, greedy, trees

Train Maintenance

brute force, data structures, implementation

Mathematics Curriculum

brute force, combinatorics, dp, trees

Portal

brute force, data structures, dp, greedy, implementation

Minimal Coverage

dp

Array Stabilization (AND version)

brute force, graphs, math, number theory, shortest paths

Array Optimization by Deque

data structures, greedy

Permutation Minimization by Deque

constructive algorithms, greedy, math

Productive Meeting

constructive algorithms, graphs, greedy

Ticks

greedy, implementation

Shifting Sort

implementation, sortings

Casimir's String Solitaire

math, strings

The Mind

constructive algorithms, interactive, probabilities

Labyrinth

binary search, dsu, greedy

Kingdom of Islands

brute force, graphs, implementation

Just Kingdom

brute force, data structures, dfs and similar

Interactive Rays

geometry, interactive

Higher Order Functions

implementation, strings

Game of Chance

math, probabilities

Framing Pictures

geometry

Easy Scheduling

implementation, math

Dragon Curve

Cactus Lady and her Cing

Building Forest Trails

data structures, dsu

Anti-Tetris

constructive algorithms, graphs, shortest paths

Managing Telephone Poles

data structures, geometry

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Knitting Batik

implementation, math

Jeopardy of Dropped Balls

binary search, brute force, dsu, implementation

Illusions of the Desert

data structures, trees

Holiday Wall Ornaments

dp, strings

GCD Festival

math, number theory

Finding Expected Value

math

Eye-Pleasing City Park Tour

data structures, trees

Divisible by Twenty-Five

brute force, dfs and similar, dp

Cyclic Sum

data structures, fft, number theory

Building an Amusement Park

binary search, geometry

Another Sorting Problem

data structures, sortings, strings

Occurrences

combinatorics, dfs and similar, dp, dsu, fft, graphs

Coloring

combinatorics, constructive algorithms, implementation, math

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Slay the Dragon

binary search, greedy, sortings, ternary search

Combinatorics Homework

combinatorics, greedy, math

Regular Bracket Sequences

constructive algorithms

Swaps

greedy, math, sortings

Countdown

greedy

Stations

data structures

Polygon

binary search, dp, geometry

Bridge Club

flows, graph matchings, graphs, greedy

Paint

dp, greedy

Xor of 3

brute force, constructive algorithms, greedy, two pointers

Book

binary search, brute force, data structures, dp, graphs, implementation, sortings

Two Railroads

*special problem

Physical Examination

*special problem, binary search, data structures

Laser Beams

*special problem, geometry, probabilities

A Battle Against a Dragon

*special problem, data structures, dp

Kotlinforces

*special problem, constructive algorithms, dp

Fix the String

*special problem, bitmasks, dp, greedy

Sweepstake

*special problem, brute force, constructive algorithms, implementation, math

Rhyme

*special problem, implementation

Epic Novel

*special problem, math

Sequence of Comparisons

*special problem

Palindromic Hamiltonian Path

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

Playoff Restoration

bitmasks, brute force, hashing, implementation, meet-in-the-middle

Inconvenient Pairs

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

Jury Meeting

combinatorics, math

Chess Tournament

constructive algorithms

Balanced Substring

implementation