Penacony

brute force, data structures, dp, hashing

Let Me Teach You a Lesson (Hard Version)

bitmasks, data structures, dp, graphs, matrices, two pointers

Let Me Teach You a Lesson (Easy Version)

data structures, dp, matrices, two pointers

Cases

bitmasks, brute force, dp, strings

Minecraft

bitmasks, brute force, dp, graphs, math

Hungry Games

binary search, dp, two pointers

Ultra-Meow

combinatorics, dp, math

Valuable Cards

brute force, dp, greedy, number theory, two pointers

Test of Love

dp, greedy, implementation

Polygonal Segments

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

Grid Puzzle

bitmasks, brute force, dp, greedy, implementation

Distance to Different

combinatorics, dp, math

Smithing Skill

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

Heartbeat

combinatorics, dp, fft, math

The Omnipotent Monster Killer

brute force, dfs and similar, dp, trees

Spinning Round (Hard Version)

divide and conquer, dp, trees

Spinning Round (Easy Version)

divide and conquer, dp, trees

Interesting Problem (Hard Version)

dp

Interesting Problem (Easy Version)

dp

World is Mine

dp, games

Basil's Garden

dp, greedy

Mathematical Problem

brute force, dp, greedy, implementation, math, two pointers

Maximize the Largest Component (Hard Version)

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

Tower Capturing

combinatorics, dp, geometry

Reconstruction

brute force, dp, math

Shuffle

dp, greedy, trees

Magnitude (Hard Version)

combinatorics, dp, greedy, math

Magnitude (Easy Version)

dp, greedy, math

Your Loss

bitmasks, brute force, dp, trees

Number of k-good subarrays

bitmasks, brute force, combinatorics, divide and conquer, dp, math, meet-in-the-middle

Boring Day

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

Turtle and Paths on a Tree

data structures, dp, trees

Fixing a Binary String

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

Computing Machine

brute force, data structures, dp, greedy, implementation

Nikita and LCM

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

Remove Bridges

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

Job Interview

binary search, dp, greedy, implementation, two pointers

Mind Bloom

dp

Set

bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math

Paint the Tree

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

Money Buys Happiness

dp

Maximum GCD Sum Queries

bitmasks, brute force, dp, implementation, number theory

Chess For Three

brute force, dp, implementation, math

Binary Cut

dp, greedy, implementation, sortings, strings

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

Min-Fund Prison (Medium)

brute force, dfs and similar, dp, graphs, trees

Trails (Hard)

dp, matrices

Trails (Medium)

dp, matrices

Trails (Easy)

dp

Game on Tree (Hard)

dfs and similar, dp, games, trees

Game on Tree (Medium)

dfs and similar, dp, games, trees

Card Pairing

dp, greedy, hashing, implementation

Unique Array

binary search, data structures, divide and conquer, dp, greedy

Minimizing the Sum

dp, implementation

Division + LCP (hard version)

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

Division + LCP (easy version)

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

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

Composite Spells

*special problem, dp

1-3-5

*special problem, dp

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 and the Mex Operator

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

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

GCD on a grid

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

Unfair Game

dp, games, greedy, math, schedules

Unique Strings

combinatorics, dp, math

Colored Balls

combinatorics, dp, math, sortings

Thanos Snap

binary search, dp, games, greedy, trees

Shuffling Songs

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

Product of Binary Decimals

brute force, dp, implementation, number theory

Annual Ants' Gathering

dfs and similar, dp, greedy, trees

Grove

brute force, dfs and similar, dp, geometry, probabilities

Arrow Path

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

Array Fix

brute force, dp, greedy, implementation

Nobody is needed

2-sat, data structures, dfs and similar, dp

Girl Permutation

combinatorics, dp, math, number theory

Tree Cutting

binary search, dp, greedy, implementation, trees

Maximum Sum

dp, greedy, math

Seraphim the Owl

dp, greedy

Minimum Hamming Distance

dp

Counting Is Fun (Hard Version)

combinatorics, dp

Counting Is Fun (Easy Version)

brute force, combinatorics, dp, math

Farmer John's Favorite Intern

data structures, dp, flows, trees

Bessie and Cards

combinatorics, dp, math

Learning to Paint

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

Rudolf and k Bridges

binary search, data structures, dp, two pointers

Rudolf and the Ball Game

dfs and similar, dp, implementation

Rudolf and the Ugly String

dp, greedy, strings

Rudolf and 121

brute force, dp, greedy, math

Big Persimmon

*special problem, dp, games

Draw Polygon Lines

*special problem, constructive algorithms, dp, geometry, interactive

Binary Path

dp, greedy, implementation

Messenger in MAC

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

Yet Another Coin Problem

brute force, dp, greedy, math

Turtle Mission: Robot and the Earthquake

dfs and similar, dp, graphs, shortest paths

Feed Cats

data structures, dp, sortings

Thorns and Coins

dp, greedy, implementation