Magic Trick

combinatorics, math, probabilities

4-point polyline

brute force, constructive algorithms, geometry, trees

Eevee

brute force, implementation, strings

Devu and Flowers

bitmasks, combinatorics, number theory

Count Good Substrings

math

Predict Outcome of the Game

brute force, implementation, math

Sort the Array

implementation, sortings

Game With Sticks

implementation

Jzzhu and Sequences

implementation, math

Jzzhu and Children

implementation

Jzzhu and Squares

dp, math, number theory

Jzzhu and Numbers

bitmasks, combinatorics, dp

Jzzhu and Apples

constructive algorithms, number theory

Jzzhu and Cities

graphs, greedy, shortest paths

Jzzhu and Chocolate

greedy, math

Divisors

brute force, dfs and similar, implementation, number theory

Multiplication Table

binary search, brute force

Painting Fence

divide and conquer, dp, greedy

Suffix Structures

implementation, strings

Rewards

implementation

DZY Loves Strings

greedy, implementation

DZY Loves Hash

implementation

DZY Loves Bridges

math, matrices

DZY Loves Games

math, matrices, probabilities

DZY Loves Fibonacci Numbers

data structures, math, number theory

DZY Loves Modification

brute force, data structures, greedy

DZY Loves Sequences

dp, implementation, two pointers

DZY Loves Chemistry

dfs and similar, dsu, greedy

DZY Loves Chessboard

dfs and similar, implementation

DZY Loves Planting

binary search, dsu, trees

DZY Loves Strings

binary search, hashing, strings, two pointers

DZY Loves Colors

data structures

DZY Loves FFT

probabilities

DZY Loves Physics

greedy, math

Kolya and Tandem Repeat

brute force, implementation, strings

Anton and Letters

constructive algorithms, implementation

Gena and Second Distance

geometry

Adam and Tree

data structures, trees

Artem and Array

data structures, greedy

Andrey and Problem

greedy, math, probabilities

Borya and Hanabi

bitmasks, brute force, implementation

Valera and Number

bitmasks, dp, math, probabilities

Valera and Swaps

constructive algorithms, dsu, graphs, implementation, math, string suffix structures

Valera and Tubes

constructive algorithms, dfs and similar, implementation

Valera and Fruits

greedy, implementation

Valera and Antique Items

implementation

Berland Federalization

dp, trees

One-Based Arithmetic

brute force, dfs and similar, divide and conquer

Balancer

greedy, implementation

Forgotten Episode

implementation

Devu and Birthday Celebration

combinatorics, dp, math

Devu and his Brother

binary search, sortings, ternary search, two pointers

Devu and Partitioning of the Array

brute force, constructive algorithms, implementation, number theory

Devu, the Dumb Guy

implementation, sortings

Devu, the Singer and Churu, the Joker

greedy, implementation

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

The Child and Sequence

data structures, math

The Child and Polygon

dp, geometry

The Child and Zoo

dsu, sortings

The Child and Toy

graphs, greedy, sortings

The Child and Set

bitmasks, greedy, implementation, sortings

The Child and Homework

implementation

Banners

brute force, data structures, dp

Cardboard Box

data structures, greedy

Pudding Monsters

dp

Dungeons and Candies

dsu, graphs, greedy, trees

Om Nom and Spiders

implementation, math

Feed with Candy

greedy

Special Graph

Special Grid

brute force, dp, greedy

Cardiogram

implementation

Pasha Maximizes

greedy

Queue on Bus Stop

implementation

Furukawa Nagisa's Tree

binary search, divide and conquer, sortings, trees

Nanami's Power Plant

flows

Tachibana Kanade's Tofu

dp

Nanami's Digital Board

dsu, implementation

Ryouko's Memory Note

implementation, math, sortings

Kuriyama Mirai's Stones

dp, implementation, sortings

Kitahara Haruki's Gift

brute force, implementation

Square Tiling

constructive algorithms, greedy

Prefixes and Suffixes

dp, string suffix structures, strings, two pointers

Prime Swaps

greedy, sortings

Football Kit

brute force, greedy, implementation

Choosing Teams

greedy, implementation, sortings

Chemistry Experiment

binary search, data structures, ternary search

Random Task

binary search, bitmasks, combinatorics, dp, math

k-Tree

dp, implementation, trees

Shower Line

brute force, implementation

Black Square

implementation

Balls Game

brute force, two pointers

Points and Segments (easy)

constructive algorithms, sortings

Points and Segments

graphs

Tricky Function

data structures, divide and conquer, geometry

Guess the Tree

bitmasks, constructive algorithms, dp, greedy, trees

Working out

dp

Xor-tree

dfs and similar, trees

Police Patrol

greedy, implementation, math, ternary search

Match & Catch

dp, string suffix structures, strings

Checkposts

dfs and similar, graphs, two pointers