Nastya and Door

greedy, implementation

Nastya and Rice

math

Nastya and CBS

brute force, data structures, hashing

Nastya and Bees

graphs, interactive, probabilities

Nastya and Time Machine

constructive algorithms, dfs and similar, graphs, trees

Nastya and Unexpected Guest

dfs and similar, dp, graphs, shortest paths

Nastya and Scoreboard

bitmasks, dp, graphs, greedy

Nastya and Strange Generator

brute force, data structures, greedy, implementation

Sorted Adjacent Differences

constructive algorithms, sortings

Filling Diamonds

brute force, dp, implementation, math

JYPnation

graphs

Nested Rubber Bands

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

Perfect Triples

bitmasks, brute force, constructive algorithms, divide and conquer, math

Edge Weight Assignment

bitmasks, constructive algorithms, dfs and similar, greedy, math, trees

Powered Addition

greedy, math

Kana and Dragon Quest game

greedy, implementation, math

Ichihime and Triangle

constructive algorithms, math

Journey

data structures, divide and conquer, graphs, trees

Chiori and Doll Picking (hard version)

bitmasks, brute force, combinatorics, math

Chiori and Doll Picking (easy version)

bitmasks, brute force, combinatorics, math

Yui and Mahjong Set

constructive algorithms, interactive

Kaavi and Magic Spell

dp, strings

Xenia and Colorful Gems

binary search, greedy, math, sortings, two pointers

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

Robots on a Grid

data structures, dfs and similar, dsu, graphs, greedy, matrices

Three Blocks Palindrome (hard version)

brute force, data structures, dp, two pointers

Three Blocks Palindrome (easy version)

binary search, brute force, data structures, dp, two pointers

Anti-Sudoku

constructive algorithms, implementation

Two Teams Composing

binary search, greedy, implementation, sortings

Construct the String

constructive algorithms

Candies and Two Sisters

math

Substring Search

bitmasks, brute force, fft

Strange Function

binary search, data structures, dp, greedy

Divisor Paths

combinatorics, graphs, greedy, math, number theory

Minimum Euler Cycle

constructive algorithms, graphs, greedy, implementation

Circle of Monsters

brute force, constructive algorithms, greedy, math

Middle Class

greedy, sortings

Level Statistics

implementation, math

Kate and imperfection

greedy, implementation, math, number theory, sortings, two pointers

Road to 1600

brute force, constructive algorithms

Challenges in school №41

brute force, constructive algorithms, games, graphs, greedy, implementation, sortings

Eugene and an array

binary search, data structures, implementation, two pointers

Kind Anton

greedy, implementation

Little Artem

constructive algorithms

No Monotone Triples

data structures

Independent Set

dfs and similar, dp, trees

Height All the Same

combinatorics, constructive algorithms, math, matrices

Walk on Matrix

bitmasks, constructive algorithms, math

K-Complete Word

dfs and similar, dsu, greedy, implementation, strings

Composite Coloring

brute force, constructive algorithms, greedy, math, number theory

Exercising Walk

greedy, implementation, math

It's showtime

*special problem

Lingua Romana

*special problem

Elementary!

*special problem, brute force, dp, strings

Jordan Smiley

*special problem, dfs and similar, geometry, implementation

Again?

*special problem, implementation

...And after happily lived ever they

*special problem, bitmasks

Limericks

*special problem, math, number theory

Is it rated?

*special problem

Dreamoon Likes Permutations

implementation, math

Dreamoon and Ranking Collection

implementation

Dreamoon Loves AA

binary search, greedy

Dreamoon Likes Strings

constructive algorithms, data structures

Drazil Likes Heap

constructive algorithms, data structures, greedy, implementation

Dreamoon Likes Sequences

bitmasks, combinatorics, math

Dreamoon Likes Coloring

constructive algorithms, greedy, implementation, math

Make k Equal

greedy

Tree Queries

dfs and similar, graphs, trees

Carousel

constructive algorithms, dp, graphs, greedy, math

Ternary XOR

greedy, implementation

K-th Beautiful String

binary search, brute force, combinatorics, implementation, math

Divisibility Problem

math

Letters and Question Marks

bitmasks, dp, string suffix structures

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Count The Blocks

combinatorics, dp, math

Infinite Path

brute force, dfs and similar, graphs, math, number theory

Game with Chips

constructive algorithms, implementation

Princesses and Princes

brute force, graphs, greedy

Sum of Odd Integers

math

Spiderweb Trees

dp, geometry, trees

Wise Men (Hard Version)

bitmasks, dp, math

Wise Men (Easy Version)

bitmasks, brute force, dp, meet-in-the-middle

Bombs

data structures, two pointers

Prefix-Suffix Palindrome (Hard version)

binary search, greedy, hashing, string suffix structures, strings

Prefix-Suffix Palindrome (Easy version)

hashing, string suffix structures, strings

Permutation Partitions

combinatorics, greedy, math

Maximums

implementation, math

Bad Ugly Numbers

constructive algorithms, number theory

Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

Ehab's REAL Number Theory Problem

brute force, dfs and similar, graphs, number theory, shortest paths

Ehab the Xorcist

bitmasks, constructive algorithms, greedy, number theory

Ehab and Path-etic MEXs

constructive algorithms, dfs and similar, greedy, trees

CopyCopyCopyCopyCopy

greedy, implementation

EhAb AnD gCd

constructive algorithms, greedy, number theory

Maximum White Subtree

dfs and similar, dp, graphs, trees

Sleeping Schedule

dp, implementation

Pair of Topics

binary search, data structures, sortings, two pointers

Frog Jumps

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

Yet Another Palindrome Problem

brute force, strings

Yet Another Tetris Problem

implementation, number theory