Beauty of the mountains

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

Turtle and an Incomplete Sequence

bitmasks, brute force, constructive algorithms, greedy, implementation, math

Turtle and an Infinite Sequence

bitmasks, math

Field Division (easy version)

data structures, math, sortings

Permutation of Rows and Columns

constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings

GCD-sequence

greedy, implementation, math, number theory

Sofia and the Lost Operations

constructive algorithms, greedy

Fixing a Binary String

bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings

Elections

data structures, greedy, implementation, math

Manhattan Permutations

constructive algorithms, data structures, greedy, implementation, math

Nikita and LCM

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

Job Interview

binary search, dp, greedy, implementation, two pointers

Paint the Tree

brute force, dfs and similar, dp, greedy, shortest paths, trees

Cutting Game

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

Money Buys Happiness

dp

Ingenuity-2

constructive algorithms, greedy, implementation

Beautiful Triple Pairs

combinatorics, data structures

Cat, Fox and Double Maximum

constructive algorithms, greedy, implementation, math, sortings

Cat, Fox and the Lonely Array

binary search, bitmasks, data structures, greedy, math, two pointers

XOUR

data structures, dsu, sortings

Circle Perimeter

binary search, brute force, dfs and similar, geometry, implementation, math

Find the Car

binary search, math, sortings

Min-Fund Prison (Easy)

dfs and similar, trees

Trails (Easy)

dp

Game on Tree (Hard)

dfs and similar, dp, games, trees

Game on Tree (Medium)

dfs and similar, dp, games, trees

Game on Tree (Easy)

games

Exact Neighbours (Easy)

constructive algorithms

Shop Game

data structures, greedy, math, sortings

Minimizing the Sum

dp, implementation

Division + LCP (easy version)

binary search, data structures, dp, hashing, string suffix structures, strings

Equal XOR Segments

binary search, data structures

Cells Arrangement

constructive algorithms

Permutation Game

brute force, dfs and similar, games, graphs, greedy, math

Reverse Card (Easy Version)

brute force, math, number theory

Permutation Counting

binary search, greedy, implementation, math, sortings

Missing Subsequence Sum

bitmasks, constructive algorithms, greedy, number theory

Everything Nim

games, greedy, math, sortings

Yet Another Permutation Constructive

*special problem, constructive algorithms

Staircase

*special problem

Firewood

*special problem

Clock in the Pool

*special problem, math

A BIT of an Inequality

bitmasks, brute force, dp, math

How Does the Rook Move?

combinatorics, dp, math

Nene's Magical Matrix

constructive algorithms, greedy, math

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Unfair Game

dp, games, greedy, math, schedules

Long Inversions

brute force, greedy, implementation, sortings

Inaccurate Subsequence Search

data structures, two pointers

Inhabitant of the Deep Sea

greedy, implementation, math

Colored Balls

combinatorics, dp, math, sortings

Ticket Hoarding

greedy, math, sortings

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings

0, 1, 2, Tree!

bitmasks, brute force, greedy, implementation, trees

Nearly Shortest Repeating Substring

brute force, implementation, number theory, strings

Disks

dfs and similar, geometry, graph matchings, graphs

Annual Ants' Gathering

dfs and similar, dp, greedy, trees

Charming Meals

binary search, brute force, greedy, sortings

Tandem Repeats?

brute force, strings, two pointers

Arrow Path

brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths

Birthday Gift

bitmasks, brute force, constructive algorithms, greedy, implementation

Tree Cutting

binary search, dp, greedy, implementation, trees

Kirill and Mushrooms

data structures, sortings

Binary Search

binary search, constructive algorithms, greedy

Seraphim the Owl

dp, greedy

MEX Game 1

games, greedy

Bessie's Birthday Cake (Hard Version)

geometry, greedy, math

Bessie's Birthday Cake (Easy Version)

geometry, greedy, math

Rudolf and Imbalance

binary search, greedy, sortings, two pointers

Rudolf and k Bridges

binary search, data structures, dp, two pointers

Pho Restaurant

Bit Counting Sequence

Binary Path

dp, greedy, implementation

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

Exam in MAC

binary search, combinatorics, implementation, math

Messenger in MAC

binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings

Find a Mine

binary search, constructive algorithms, geometry, greedy, interactive, math

Turtle vs. Rabbit Race: Optimal Trainings

binary search, implementation, math, ternary search

Feed Cats

data structures, dp, sortings

Final Countdown

implementation, math, number theory

Card Game

greedy, implementation

LR-remainders

brute force, data structures, implementation, math, two pointers

Chat Screenshots

combinatorics, dfs and similar, graphs

Anna and the Valentine's Day Gift

games, greedy, math, sortings

Divisible Pairs

combinatorics, math, number theory

Sum over all Substrings (Easy Version)

brute force, dp, greedy, strings

Lexicographically Largest

binary search, constructive algorithms, data structures, greedy, sortings

Sasha and a Walk in the City

combinatorics, dp, math, trees

Sasha and the Casino

binary search, brute force, constructive algorithms, games, greedy, math

Lonely Mountain Dungeons

brute force, data structures, greedy, math, ternary search

Physical Education Lesson

brute force, math, number theory

Microcycle

data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees

Klever Permutation

constructive algorithms, math, two pointers

Find the Different Ones!

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

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Vlad and an Odd Ordering

binary search, bitmasks, data structures, dp, implementation, math, number theory

Vlad and Division

bitmasks, greedy

Good Trip

combinatorics, dp, math, probabilities

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Slimes

binary search, constructive algorithms, data structures, greedy, two pointers