Counting Is Not Fun (Easy Version)

combinatorics, data structures, dfs and similar, dp, dsu, implementation, math

Game With Triangles

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

Minimal Coprime

math

Kevin and Teams

2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers

Kevin and Binary String (Hard Version)

2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers

Kevin and Binary String (Easy Version)

2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers

Kevin and And

2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers

Kevin and Numbers

2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers

Kevin and Puzzle

2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers

Kevin and Geometry

2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers

Kevin and Arithmetic

2-sat, binary search, bitmasks, brute force, chinese remainder theorem, combinatorics, constructive algorithms, data structures, dfs and similar, divide and conquer, dp, dsu, expression parsing, fft, flows, games, geometry, graph matchings, graphs, greedy, hashing, implementation, interactive, math, matrices, meet-in-the-middle, number theory, probabilities, schedules, shortest paths, sortings, string suffix structures, strings, ternary search, trees, two pointers

Coffee Break

data structures, greedy, math

Secret Message

constructive algorithms, dfs and similar, math

Gifts Order

data structures, greedy, implementation, math, matrices

Trip to the Olympiad

bitmasks, constructive algorithms, greedy, math

MEX Table

constructive algorithms, math

Xor of Median (Hard Version)

bitmasks, brute force, combinatorics, dp, math

Xor of Median (Easy Version)

bitmasks, brute force, combinatorics, dp, math

Nested Segments

combinatorics, dfs and similar, dp, dsu, math

Palindromic Subsequences

brute force, constructive algorithms, math

Shape Perimeter

constructive algorithms, math

Cosmic Divide

brute force, geometry, hashing, math, strings

Scarecrow

greedy, implementation, math

The Trail

brute force, constructive algorithms, greedy, math, two pointers

Two Frogs

constructive algorithms, games, greedy, math

Affectionate Arrays (Hard Version)

data structures, dp, graphs, greedy, math, shortest paths, two pointers

Naive String Splits

binary search, brute force, greedy, hashing, math, number theory, strings

Earnest Matrix Complement

brute force, data structures, dp, greedy, implementation, math

Refined Product Optimality

binary search, data structures, greedy, math, schedules, sortings

Bewitching Stargazer

bitmasks, divide and conquer, dp, math

Tender Carpenter

dp, geometry, greedy, math

Managing Cluster

dp, graphs, math, trees

Cactus without Bridges

constructive algorithms, math

Joker

brute force, greedy, implementation, math

Journey

binary search, math

Maximum modulo equality

data structures, divide and conquer, math, number theory

Digital string maximization

brute force, greedy, math, strings

Uninteresting Number

brute force, dp, math

Transfusion

brute force, greedy, math

Kevin and Puzzle (Hard Version)

bitmasks, fft, math

Kevin and Matrices

brute force, combinatorics, dp, math

Kevin and Math Class

brute force, data structures, divide and conquer, dp, implementation, math, trees

Kevin and Combination Lock

brute force, greedy, implementation, math, number theory

Alyona and a Square Jigsaw Puzzle

implementation, math

X Aura

graphs, math, shortest paths

Grid Game 3-angle

games, math

ICPC Square

math, number theory

Hard Demon Problem

constructive algorithms, data structures, dp, implementation, math

Easy Demon Problem

binary search, brute force, data structures, math, number theory

Insane Problem

binary search, greedy, implementation, math, number theory

Harder Problem

constructive algorithms, greedy, math

Hard Problem

greedy, math

Easy Problem

brute force, math

Problem about GCD

brute force, flows, math, number theory

Sums on Segments

binary search, brute force, data structures, dp, greedy, math

Digits

math, number theory

Coin Transformation

brute force, math

Sheet Music

combinatorics, dp, math

Beautiful Array

constructive algorithms, math

Bowling Frame

binary search, brute force, math

Number of Cubes

combinatorics, dp, math, number theory

Control of Randomness

combinatorics, dfs and similar, dp, graphs, greedy, math, probabilities, trees

Ordered Permutations

bitmasks, combinatorics, constructive algorithms, greedy, math, two pointers

Paint a Strip

constructive algorithms, greedy, math

Game of Division

games, math

Shohag Loves Pebae

math, number theory

Shohag Loves Counting (Easy Version)

combinatorics, dp, math, number theory

Shohag Loves Inversions

combinatorics, dp, implementation, math

Shohag Loves GCD

constructive algorithms, greedy, math, number theory

Shohag Loves XOR (Hard Version)

bitmasks, brute force, math, number theory

Shohag Loves XOR (Easy Version)

bitmasks, brute force, math, number theory

Bridge Renovation

brute force, dp, greedy, math, two pointers

Grid Walk

brute force, dp, greedy, math, number theory

Alternative Platforms

combinatorics, data structures, fft, math, sortings

Barrels

data structures, greedy, math

Make It Equal

binary search, brute force, greedy, math

Natlan Exploring

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

Ardent Flames

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

Superultra's Favorite Permutation

constructive algorithms, greedy, math, number theory

Library of Magic

binary search, constructive algorithms, divide and conquer, interactive, math, number theory

Monster

binary search, brute force, constructive algorithms, greedy, implementation, math, ternary search

Yet Another Real Number Problem

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

Alya and Permutation

bitmasks, constructive algorithms, math

Everyone Loves Tres

constructive algorithms, greedy, math, number theory

Sliding

implementation, math

Khayyam's Royal Decree (Hard Version)

combinatorics, dp, math, sortings

Khayyam's Royal Decree (Easy Version)

combinatorics, dp, math, sortings

Permutations Harmony

combinatorics, constructive algorithms, greedy, hashing, math

King Keykhosrow's Mystery

brute force, chinese remainder theorem, math, number theory

Kosuke's Sloth

brute force, math, number theory

Sakurako, Kosuke, and the Permutation

brute force, data structures, dfs and similar, dsu, graphs, greedy, math

Kousuke's Assignment

data structures, dp, dsu, greedy, math

Sakurako and Kosuke

constructive algorithms, implementation, math

Peanuts

combinatorics, dp, games, math

Balanced

constructive algorithms, data structures, greedy, implementation, math

Trinity

binary search, math, sortings, two pointers

Medians

constructive algorithms, greedy, implementation, math

Circuit

greedy, implementation, math, number theory

Penchick and Chloe's Trees

data structures, dfs and similar, dp, greedy, implementation, math, sortings, trees

Penchick and BBQ Buns

constructive algorithms, math, number theory