New Year and Binary Tree Paths

bitmasks, brute force, combinatorics, dp

A Perfect Problem

combinatorics, dp, math

Chests and Keys

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

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

Joking (Hard Version)

dp, interactive

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Twilight and Ancient Scroll (harder version)

dp, hashing, implementation, string suffix structures, strings, two pointers

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Split

binary search, data structures, dp, greedy

Tree Cutting

bitmasks, dfs and similar, dp

Asterism Stream

dp, math, matrices

Zombies

binary search, dp

The Third Grace

data structures, dp

Thanos Snap

binary search, dp, games, greedy, trees

A Preponderant Reunion

constructive algorithms, dp

Game of AI (easy version)

combinatorics, constructive algorithms, dp, fft, math

Bitwise Magic

dp, math

Minimal Subset Difference

dp

Byteland coins

combinatorics, dp, math

Xor-quiz

constructive algorithms, dp, interactive, math, number theory

An easy problem about trees

dp, games, greedy, trees

Hard Optimization

dp

Math, math everywhere

brute force, dp, math, meet-in-the-middle, number theory

Uniform Chemistry

dp, math

Chess Rush

*special problem, combinatorics, dp, implementation, math

String Journey

data structures, dp, string suffix structures

Number of Binominal Coefficients

dp, math, number theory

Transforming Sequence

combinatorics, dp, fft, math

A New Beginning

data structures, dp, geometry, sortings

Numbers on the blackboard

combinatorics, dp

Reverses

dp, string suffix structures, strings

Favorite Game

bitmasks, dp

Sonya Partymaker

binary search, dp

Breadboard Capacity (easy version)

dp, flows, greedy

Squares

constructive algorithms, data structures, dp, graphs, trees

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

Ball-Stackable

constructive algorithms, data structures, dp, trees

Doping

combinatorics, dp, math

Combining Slimes

dp, math, matrices, probabilities

Codeforces Scoreboard

binary search, data structures, dp, geometry

Harry Vs Voldemort

dfs and similar, dp, graphs, trees

Code Lock

bitmasks, dp

Hex Dyslexia

bitmasks, brute force, dp, graphs

Grove

brute force, dfs and similar, dp, geometry, probabilities

Niyaz and Small Degrees

data structures, dp, trees

Replace All

combinatorics, dp, math

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Happy Cactus

dp

Caramel Clouds

data structures, dp, sortings

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Stairs

combinatorics, divide and conquer, dp, fft, math

Test Data Generation

combinatorics, divide and conquer, dp, fft, math, number theory

Mini Metro

dp

Passports

dp, implementation

Turing's Award

data structures, dp

Fake bullions

combinatorics, dfs and similar, dp, graphs, number theory

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Mateusz and an Infinite Sequence

bitmasks, brute force, dp, strings

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Zero-XOR Array

*special problem, dp

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Density of subarrays

dp, math

Making Shapes

dp

Cupboards Jumps

dp

Nora's Toy Boxes

bitmasks, combinatorics, dp

Modest Substrings

dp, strings

XOR-ranges

dp, greedy

Just Add an Edge

dfs and similar, dp, graphs

Hopping Around the Array

data structures, dp

Communism

bitmasks, dp, trees

Old Mobile

combinatorics, dp, probabilities

School Clubs

dp, fft, math, number theory, probabilities

Cacti Symphony

combinatorics, dfs and similar, dp, graphs

Jellyfish and OEIS

dp

Mateusz and Escape Room

dp

Maximum Product?

brute force, combinatorics, dp, greedy, implementation, math, two pointers

Bugaboo

bitmasks, constructive algorithms, dp, number theory

Lost Nodes

constructive algorithms, dp, graphs, interactive, sortings, trees

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

Finding the Vertex

brute force, dfs and similar, dp, interactive, trees

Anti-Proxy Attendance

constructive algorithms, dp, interactive, ternary search

Willy-nilly, Crack, Into Release!

data structures, dp

Balanced Distribution

data structures, dp, greedy

Mark and Spaceship

brute force, dp

Tenzing and Necklace

divide and conquer, dp, greedy

Slime and Sequences (Hard Version)

dp, fft, math

AquaMoon and Potatoes

brute force, data structures, dp

Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

Panda Meetups

data structures, dp, flows

Olympiad Training

binary search, data structures, dp, flows, geometry, implementation, sortings

Assigning Fares

dp, trees

Cyclic Hamming (Hard Version)

brute force, dp, fft, math, number theory

Tokitsukaze and Gems

dp, math

Slime and Hats

constructive algorithms, dp, greedy

Minimum Hamming Distance

dp

AquaMoon and Time Stop (hard version)

data structures, dp

Anti-median (Hard Version)

combinatorics, dp, math

Jellyfish and Inscryption

dp

AquaMoon and Time Stop (easy version)

data structures, dp