Cat, Fox and Swaps

graphs, math, sortings

Cat, Fox and Double Maximum

constructive algorithms, greedy, implementation, math, sortings

Cat, Fox and the Lonely Array

binary search, bitmasks, greedy, math, two pointers

Chess For Three

brute force, dp, implementation, math

Circle Perimeter

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

Find the Car

binary search, math, sortings

Shop Game

data structures, greedy, math, sortings

Two Friends

constructive algorithms, implementation, math

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Permutation Game

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

Maximize?

brute force, math, number theory

Again Counting Arrays (Hard Version)

combinatorics, dp, math

Again Counting Arrays (Easy Version)

combinatorics, dp, fft, math

Fenwick Tree

bitmasks, brute force, combinatorics, data structures, dp, math, trees

Reverse Card (Hard Version)

brute force, math, number theory

Reverse Card (Easy Version)

brute force, math, number theory

Permutation Counting

binary search, greedy, implementation, math, sortings

Everything Nim

games, greedy, math, sortings

Clock in the Pool

*special problem, math

Carousel of Combinations

brute force, combinatorics, dp, math, number theory

A BIT of an Inequality

bitmasks, brute force, dp, math

How Does the Rook Move?

combinatorics, dp, math

Nene vs. Monsters (Hard Version)

brute force, greedy, implementation, math

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Nene and the Mex Operator

bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, 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

Inhabitant of the Deep Sea

greedy, implementation, math

Yogurt Sale

math

Unique Strings

combinatorics, dp, math

Chain Reaction

binary search, data structures, dsu, greedy, implementation, math, number theory

Colored Balls

combinatorics, dp, math, sortings

Long Multiplication

greedy, math, number theory

Make It Ugly

implementation, math

Painting the Ribbon

constructive algorithms, greedy, math

Mathematician Takeover

binary search, dfs and similar, math

Sweep Line

combinatorics, games, math

Clacking Balls

combinatorics, math, probabilities

No Palindromes

brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings

Buying Jewels

constructive algorithms, greedy, math

Ticket Hoarding

greedy, math, sortings

Dual Trigger

constructive algorithms, greedy, math

Clock Conversion

implementation, math

Make Triangle

constructive algorithms, math

Division Avoidance

greedy, math

Damage per Second

brute force, math

Rare Coins

combinatorics, math, probabilities

Girl Permutation

combinatorics, dp, math, number theory

Maximum Sum

dp, greedy, math

GCD is Greater

brute force, data structures, math, number theory

Fireworks

math, number theory

Setting up Camp

greedy, math

Destroying Bridges

graphs, greedy, math

Counting Is Fun (Easy Version)

brute force, combinatorics, dp, math

Non-Palindromic Substring

hashing, implementation, math, strings

Bessie and Cards

combinatorics, dp, math

Farmer John's Favorite Function

brute force, data structures, implementation, math

Bessie's Birthday Cake (Hard Version)

geometry, greedy, math

Bessie's Birthday Cake (Easy Version)

geometry, greedy, math

Bessie and MEX

constructive algorithms, math

Farmer John's Challenge

constructive algorithms, math

Rudolf and 121

brute force, dp, greedy, math

Rudolf and the Ticket

brute force, math

Shuffle Party

implementation, math

Yet Yet Another Permutation Problem

divide and conquer, fft, math

Pinball

binary search, data structures, implementation, math, two pointers

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

Exam in MAC

binary search, combinatorics, implementation, math

Find a Mine

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

Yet Another Coin Problem

brute force, dp, greedy, math

Too Min Too Max

greedy, math

Turtle Magic: Royal Turtle Shell Pattern

bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math

Turtle vs. Rabbit Race: Optimal Trainings

binary search, implementation, math, ternary search

Turtle Tenacity: Continual Mods

constructive algorithms, greedy, math, number theory, sortings

Turtle Fingers: Count the Values of k

brute force, implementation, math, number theory

Turtle Math: Fast Three Task

implementation, math, number theory

Turtle Puzzle: Rearrange and Negate

greedy, math, sortings

Moving Platforms

graphs, math, number theory, shortest paths

Final Countdown

implementation, math, number theory

LR-remainders

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

One-Dimensional Puzzle

combinatorics, math, number theory

Anna and the Valentine's Day Gift

games, greedy, math, sortings

Divisible Pairs

combinatorics, math, number theory

Make Equal Again

brute force, greedy, math

2..3...4.... Wonderful! Wonderful!

combinatorics, dp, math

Permutation Printing

brute force, constructive algorithms, math

Sasha and the Wedding Binary Search Tree

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

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Sasha and a Walk in the City

combinatorics, dp, math, trees

Sasha and the Casino

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

Sasha and the Drawing

constructive algorithms, greedy, math

Sasha and the Beautiful Array

constructive algorithms, greedy, math, sortings

Digital Patterns

combinatorics, data structures, implementation, math

Modular Sequence

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

Lonely Mountain Dungeons

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

Physical Education Lesson

brute force, math, number theory

Rectangle Cutting

geometry, math

Paint Charges

data structures, dp, greedy, math