The Game Of Parity

games

Word Cut

dp

Text Messaging

expression parsing, greedy, strings

New School

binary search, data structures, dp, greedy, implementation, sortings

F1 Champions

implementation

Fence

dp

Railguns

brute force, dfs and similar, dp, graphs

Korney Korneevich and XOR (hard version)

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

Colorful Points

data structures, greedy, implementation

Order book

combinatorics, data structures, greedy

Company

binary search, data structures, dfs and similar, greedy, trees

Numbers Exchange

greedy, implementation, math

Too Many Impostors (hard version)

constructive algorithms, implementation, interactive, math

K and Medians

constructive algorithms, greedy, math

Isomorphic Strings

hashing, strings

Array Beauty

dp

Hongcow's Game

bitmasks, divide and conquer, interactive

Chip 'n Dale Rescue Rangers

binary search, geometry, math

Sereja and the Arrangement of Numbers

graphs, greedy, sortings

Node Pairs

dp, graphs, math, number theory

Genetic Engineering

implementation, two pointers

Edge Reverse

binary search, dfs and similar, graphs, trees

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Towers

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

Big Data

*special problem

Evolution of Weasels

greedy, implementation, strings

Warrior and Archer

games

The Maths Lecture

dp, implementation

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

The Maximum Subtree

dfs and similar, dp, graphs, trees

Vasya and Magic Matrix

dp, math, probabilities

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Hamiltonian Spanning Tree

dfs and similar, dp, graph matchings, greedy, trees

Great Grids

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

Game

dfs and similar, greedy

Phoenix and Earthquake

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

Unsorting Array

brute force, sortings

List Of Integers

binary search, bitmasks, brute force, combinatorics, math, number theory

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Phone Number

dp

Full Binary Tree Queries

brute force, implementation, trees

Nearest Leaf

data structures, trees

Spyke Chatting

implementation

Train Maintenance

brute force, data structures, implementation

Greedy Shopping

binary search, data structures, divide and conquer, greedy, implementation

String Set Queries

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

Door Frames

greedy, implementation

The Beach

constructive algorithms, dfs and similar, graphs, shortest paths

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

Maximum Monogonosity

brute force, dp, math

Jamie and Binary Sequence (changed after round)

bitmasks, greedy, math

Subtree Minimum Query

data structures, trees

IT Restaurants

dfs and similar, dp, trees

Yet Another Inversions Problem

combinatorics, data structures, dp, implementation, math, number theory

Numbers

combinatorics, dp

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

K Integers

binary search, data structures

Maximize Mex

flows, graph matchings, graphs

Network Mask

*special problem, bitmasks, brute force, implementation

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Restore Cube

brute force, geometry

Points

implementation, math

Greg and Friends

combinatorics, dp, graphs, shortest paths

Red-Black Pepper

brute force, data structures, greedy, math, number theory

Earth Wind and Fire

constructive algorithms, greedy, math, sortings, two pointers

Insertion Sort

data structures, dp, implementation, math

Chopping Carrots (Hard Version)

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

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Substitutes in Number

dp

Ordering Pizza

binary search, sortings, ternary search

GukiZ and GukiZiana

binary search, data structures, implementation

DIY Garland

constructive algorithms, greedy, trees

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

Tree Modification

brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees

Alice and the Doll

brute force, data structures, greedy, implementation

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

You Are Given a Tree

data structures, dp, trees

On the Bench

combinatorics, dp

Grid

brute force

Tree

binary search, dp, trees

President and Roads

dfs and similar, graphs, hashing, shortest paths

Disposition

constructive algorithms, math

Professor GukiZ and Two Arrays

binary search, two pointers

Hockey

implementation, strings

Sum Queries?

data structures, greedy, implementation, math

Quantifier Question

dfs and similar, dp, graphs, math

Sky Full of Stars

combinatorics, math

Arthur and Walls

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

Sasha and the Wedding Binary Search Tree

brute force, combinatorics, data structures, dfs and similar, math, trees

Death Stars (easy)

implementation

Bots

combinatorics, dp, math, number theory

Ann and Books

data structures, flows, hashing

Bulls and Cows

brute force, implementation

AmShZ and G.O.A.T.

binary search, brute force, greedy, implementation, math

Scrambled

*special problem, implementation

Distributing Parts

greedy, sortings

Non-Intersecting Subpermutations

combinatorics, dp, implementation, math

Salazar Slytherin's Locket

bitmasks, dp

Memory and Scores

combinatorics, dp, math

Vlad and the Nice Paths (hard version)

binary search, combinatorics, data structures, dp, math, two pointers