Library of Magic

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

XORificator 3000

bitmasks, dp, number theory, two pointers

Reverse the Rivers

binary search, constructive algorithms, data structures, greedy

Peak Productivity Forces

constructive algorithms

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

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

Sakurako and Chefir

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

Kosuke's Sloth

brute force, math, number theory

Sakurako, Kosuke, and the Permutation

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

Sakurako's Field Trip

dp, greedy, two pointers

Peanuts

combinatorics, dp, games, math

Balanced

constructive algorithms, data structures, greedy, implementation, math

Genokraken

constructive algorithms, data structures, graphs, greedy, implementation, interactive, trees, two pointers

Trinity

binary search, math, sortings, two pointers

The Destruction of the Universe (Hard Version)

combinatorics, math

The Destruction of the Universe (Easy Version)

combinatorics, greedy, math

Orangutan Approved Subarrays

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

MEXimize the Score

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

QED's Favorite Permutation

data structures, implementation, sortings

Variance Challenge

flows, graphs, greedy

Message Spread

bitmasks, combinatorics, dp

Balanced Problem

data structures, dp

Palindrome Everywhere

constructive algorithms, graphs, greedy

Common Generator

brute force, constructive algorithms, math, number theory

Cool Graph

constructive algorithms, data structures, dfs and similar, dsu, graphs, greedy, trees

New Rating

binary search, data structures, dp, greedy

Bit Game (Hard Version)

bitmasks, dp, math

Bit Game (Easy Version)

bitmasks, brute force, games, math

The Endspeaker (Hard Version)

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

The Endspeaker (Easy Version)

binary search, dp, graphs, greedy, implementation, two pointers

Add Zeros

brute force, data structures, dfs and similar, dp, graphs, greedy

Bermart Ice Cream

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

Best Subsequence

bitmasks, dfs and similar, flows, graph matchings, graphs

Sums of Segments

binary search, data structures, dp, implementation, math

Action Figures

binary search, brute force, constructive algorithms, data structures, greedy, implementation

Variable Damage

data structures, flows

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

Hills and Pits

data structures, greedy, math, matrices

Tree of Life

dp, greedy, trees

Many Games

brute force, dp, greedy, math, probabilities

C+K+S

constructive algorithms, dfs and similar, graphs, greedy, hashing, implementation, strings

Skipping

binary search, dp, graphs, shortest paths

Billetes MX (Hard Version)

binary search, combinatorics, data structures, dsu, graphs

Billetes MX (Easy Version)

2-sat, binary search, combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Asesino (Hard Version)

constructive algorithms, dp, interactive

Asesino (Easy Version)

binary search, brute force, constructive algorithms, implementation, 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

Adjust The Presentation (Hard Version)

constructive algorithms, data structures, greedy, implementation, sortings

Count Leaves

dp, math, number theory

Expected Power

bitmasks, dp, math, probabilities

Connect the Dots

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

Bitwise Balancing

bitmasks, hashing, implementation, math, schedules, ternary search

Speedbreaker Counting (Hard Version)

dp, greedy, math

Speedbreaker Counting (Medium Version)

dp, greedy, math

Speedbreaker Counting (Easy Version)

combinatorics, dp, greedy, math

Complex Segments (Hard Version)

binary search, data structures, divide and conquer, dsu, greedy, math, sortings

Complex Segments (Easy Version)

binary search, data structures, divide and conquer, dsu, greedy, math, sortings

Max Plus Min Plus Size

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

Tree Pruning

brute force, dfs and similar, greedy, sortings, trees

Speedbreaker

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

Cards Partition

2-sat, brute force, greedy, implementation, math

Robin Hood Archery

data structures, divide and conquer, greedy, hashing

Milky Days

brute force, data structures, greedy, implementation

Sheriff's Defense

dfs and similar, dp, greedy, trees

Rendez-vous de Marian et Robin

dfs and similar, graphs, shortest paths

Robert Hood and Mrs Hood

brute force, data structures, greedy, sortings

Game in Tree (Hard Version)

binary search, data structures, 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

Minimize the Difference

binary search, greedy

Password Cracking

constructive algorithms, interactive, strings

Message Transmission Error (hard version)

hashing, string suffix structures, strings, two pointers

Message Transmission Error (easy version)

brute force, strings

Yunli's Subarray Queries (extreme version)

data structures, dp, implementation

Yunli's Subarray Queries (hard version)

binary search, data structures, dp

Yunli's Subarray Queries (easy version)

binary search, data structures, two pointers

Firefly's Queries

bitmasks, data structures, flows, math

Klee's SUPER DUPER LARGE Array!!!

binary search, math, ternary search

Satyam and Counting

geometry, math

Sakurako's Test

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

Sakurako's Task

binary search, greedy, math, number theory

Sakurako's Box

combinatorics, math, number theory

Alternating String

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

Dora and C++

math, number theory

Dora's Paint

brute force, combinatorics, constructive algorithms, graphs, implementation

Iris's Full Binary Tree

brute force, data structures, dfs and similar, trees

Iris and Adjacent Products

data structures, greedy, implementation, math

Eri and Expanded Sets

data structures, divide and conquer, math, number theory, two pointers

Iris and the Tree

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

Iris and Game on the Tree

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