Counting Is Not Fun (Easy Version)

combinatorics, data structures, dfs and similar, dp, dsu, graphs, hashing, implementation, math, trees

Triangle Tree

data structures, dfs and similar, dp, greedy, trees

Galaxy Generator

bitmasks, combinatorics, dp

Traveling Salescat

constructive algorithms, dp, geometry, graphs, greedy, math, sortings

Balanced Tree

dfs and similar, dp, graphs, greedy, trees

Kevin and Nivek

divide and conquer, dp

Kevin and Binary String (Hard Version)

data structures, dp

Kevin and And

bitmasks, brute force, dp, greedy, math, sortings

Bugged Sort

dp, greedy, sortings

Multiplicative Arrays

combinatorics, dp, number theory

Formation

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

Another Exercise on Graphs (hard version)

binary search, dfs and similar, dp, dsu, graphs, shortest paths, sortings

Another Exercise on Graphs (Easy Version)

binary search, brute force, dp, dsu, graphs, shortest paths, sortings

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

Unique Median

binary search, brute force, combinatorics, data structures, divide and conquer, dp

Affectionate Arrays (Hard Version)

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

Affectionate Arrays (Easy Version)

data structures, dp, greedy

Earnest Matrix Complement

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

Resourceful Caterpillar Sequence

dfs and similar, dp, games, graphs, greedy, trees

Managing Cluster

dp, graphs, math, trees

Snakes

bitmasks, dp, dsu, graphs

Tree Destruction

dfs and similar, dp, trees

Shift + Esc

brute force, dp

Kevin and Strange Operation

data structures, dp

Kevin and Matrices

brute force, combinatorics, dp, math

Kevin and Math Class

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

Missing Separators

dp, sortings, string suffix structures, strings

Hard Demon Problem

constructive algorithms, data structures, dp, implementation, math

Medium Demon Problem (hard version)

dfs and similar, dp, dsu, graphs, implementation, trees

Nim

bitmasks, brute force, combinatorics, dp, games, greedy, implementation, shortest paths

Two Subarrays

data structures, dp, implementation, matrices

Bottle Arrangement

data structures, divide and conquer, dp, dsu, greedy

Sheet Music

combinatorics, dp, math

Cube

bitmasks, dfs and similar, dp

Number of Cubes

combinatorics, dp, math, number theory

Control of Randomness

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

Shohag Loves Counting (Hard Version)

dp, number theory

Shohag Loves Counting (Easy Version)

combinatorics, dp, math, number theory

Shohag Loves Inversions

combinatorics, dp, implementation, math

Royal Flush

dp, implementation

Grid Walk

brute force, dp, greedy, math, number theory

Divide OR Conquer

binary search, bitmasks, data structures, dp, implementation

Natlan Exploring

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

XORificator 3000

bitmasks, dp, number theory, two pointers

Go Learn! (Hard Version)

divide and conquer, dp

Go Learn! (Easy Version)

dp, trees

Tree Operations

binary search, brute force, dfs and similar, dp, trees

Rayan vs. Rayaneh

brute force, dfs and similar, dp, number theory

Khayyam's Royal Decree (Hard Version)

combinatorics, dp, math, sortings

Khayyam's Royal Decree (Easy Version)

combinatorics, dp, math, sortings

Sakurako and Chefir

data structures, dfs and similar, dp, greedy, trees

Peanuts

combinatorics, dp, games, math

Penchick and Chloe's Trees

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

Orangutan Approved Subarrays

binary search, data structures, dp, greedy, implementation, two pointers

MEXimize the Score

combinatorics, data structures, dp, greedy, implementation, math

Message Spread

bitmasks, brute force, combinatorics, dp

Balanced Problem

data structures, dp

Alice's Adventures in Addition

bitmasks, brute force, dp, implementation

Alice's Adventures in the Rabbit Hole

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

Alice's Adventures in Cards

constructive algorithms, data structures, dp, graphs, greedy, implementation, ternary search

Bit Game (Hard Version)

bitmasks, dp, math

The Endspeaker (Hard Version)

binary search, data structures, dp, greedy, implementation, two pointers

Bermart Ice Cream

data structures, dfs and similar, divide and conquer, dp, implementation, trees

Sums of Segments

binary search, data structures, dp, implementation, math

Choose Your Queries

constructive algorithms, dfs and similar, dp, graphs, greedy, trees

Card Game

combinatorics, dp, fft, greedy, math

Attribute Checks

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

Tree of Life

dp, greedy, trees

Many Games

brute force, dp, greedy, math, probabilities

Asesino (Hard Version)

constructive algorithms, dp, interactive

Gerrymandering

dp, implementation

Digital Village (Extreme Version)

data structures, dfs and similar, dp, dsu, graphs, greedy, math, trees

Digital Village (Hard Version)

data structures, dp, dsu, graphs, math, trees

Digital Village (Easy Version)

brute force, data structures, dfs and similar, dp, dsu, fft, graphs, greedy, implementation, math, trees

Boss, Thirsty

dp, greedy, implementation

Count Leaves

dp, math, number theory

Expected Power

bitmasks, dp, math, probabilities

Connect the Dots

brute force, dp, dsu, graphs, math, trees

Speedbreaker Counting (Hard Version)

dp, greedy, math

Speedbreaker Counting (Medium Version)

dp, greedy, math

Speedbreaker Counting (Easy Version)

combinatorics, dp, greedy, math

Max Plus Min Plus Size

data structures, dp, dsu, greedy, implementation, matrices, sortings

Speedbreaker

binary search, data structures, dp, greedy, implementation, two pointers

Sheriff's Defense

dfs and similar, dp, greedy, trees

Game in Tree (Easy Version)

binary search, brute force, data structures, dp, games, greedy, implementation, trees

Prefix GCD

brute force, dp, greedy, math, number theory

Yunli's Subarray Queries (extreme version)

data structures, dp, implementation

Yunli's Subarray Queries (hard version)

binary search, data structures, dp

Subtangle Game (Hard Version)

data structures, dp, games, greedy, implementation

Subtangle Game (Easy Version)

dp, games, greedy, implementation

Lazy Narek

dp, implementation, strings

Substring Compression

data structures, dp, matrices

Turtle and Three Sequences

brute force, data structures, dp, greedy, math, probabilities, two pointers

Turtle and Inversions (Hard Version)

brute force, data structures, divide and conquer, dp, greedy, math, two pointers

Turtle and Inversions (Easy Version)

brute force, divide and conquer, dp, greedy, math

Turtle and a MEX Problem (Hard Version)

dfs and similar, dp, graphs, greedy, implementation, math

Court Blue (Hard Version)

brute force, dp, math, number theory

Court Blue (Easy Version)

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