XORificator 3000

bitmasks, dp, number theory, two pointers

Reverse the Rivers

binary search, constructive algorithms, data structures, greedy

I Love 1543

brute force, implementation, matrices

Yet Another Real Number Problem

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

Alya and Permutation

bitmasks, constructive algorithms, math

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's Field Trip

dp, greedy, two pointers

Genokraken

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

Trinity

binary search, math, sortings, two pointers

QED's Favorite Permutation

data structures, implementation, sortings

Cool Graph

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

New Rating

binary search, data structures, dp, greedy

The Endspeaker (Easy Version)

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

Add Zeros

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

Sums of Segments

binary search, data structures, dp, implementation, math

Action Figures

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

Black Cells

binary search, brute force, constructive algorithms, greedy

Attribute Checks

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

New Game

binary search, brute force, greedy, implementation, sortings, two pointers

Skipping

binary search, dp, graphs, shortest paths

Concatenation of Arrays

constructive algorithms, greedy, math, sortings

Asesino (Easy Version)

binary search, brute force, constructive algorithms, implementation, interactive

Gerrymandering

dp, implementation

Kar Salesman

binary search, greedy, math

Adjust The Presentation (Hard Version)

constructive algorithms, data structures, greedy, implementation, sortings

Adjust The Presentation (Easy Version)

constructive algorithms, greedy

Connect the Dots

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

Bitwise Balancing

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

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

Rendez-vous de Marian et Robin

dfs and similar, graphs, shortest paths

Robert Hood and Mrs Hood

brute force, data structures, greedy, sortings

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 (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 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

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

Lazy Narek

dp, implementation, strings

Colored Portals

binary search, brute force, data structures, graphs, greedy, implementation, shortest paths

Turtle and a MEX Problem (Easy Version)

greedy, math

DFS Checker (Easy Version)

brute force, data structures, dfs and similar, graphs, hashing, trees

Longest Max Min Subsequence

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

Guess The Tree

binary search, brute force, dfs and similar, divide and conquer, dsu, greedy, interactive, trees

Color Rows and Columns

dp, greedy, implementation, math

Photoshoot for Gorillas

combinatorics, data structures, greedy, math

Ruler (hard version)

binary search, interactive, ternary search

Ruler (easy version)

binary search, interactive

Expected Median

combinatorics, math

Triple Operations

dp, implementation, math

Perform Operations to Maximize Score

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

Maximize the Root

binary search, dfs and similar, dp, greedy, trees

Bomb

binary search, greedy, math

Decode

combinatorics, data structures, implementation, math

Fun

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

Squaring

brute force, constructive algorithms, greedy, implementation, math, number theory

Bouquet (Hard Version)

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

Funny Game

constructive algorithms, dsu, graphs, greedy, math, number theory, trees

Hungry Games

binary search, dp, two pointers

Light Switches

implementation, math

Valuable Cards

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

Novice's Mistake

brute force, constructive algorithms, implementation, math, strings

Coloring Game

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

Prime XOR Coloring

bitmasks, constructive algorithms, graphs, greedy, math, number theory

Absolute Zero

constructive algorithms, greedy, math

Grid Puzzle

bitmasks, brute force, dp, greedy, implementation

Mad MAD Sum

brute force, greedy, math

Smithing Skill

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

Two Movies

greedy, math

Increasing Sequence with Fixed OR

bitmasks, constructive algorithms, greedy

World is Mine

dp, games

Non-academic Problem

dfs and similar, graphs, trees

Beautiful Array

greedy, math, number theory, sortings

Mathematical Problem

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

Maximize the Largest Component (Easy Version)

brute force, data structures, dfs and similar, dsu, graphs, implementation

D-Function

combinatorics, math, number theory

Final Boss

binary search, data structures

Magnitude (Hard Version)

combinatorics, dp, greedy, math

Magnitude (Easy Version)

dp, greedy, math

Swap Dilemma

constructive algorithms, data structures, divide and conquer, greedy, math, sortings

Have Your Cake and Eat It Too

binary search, brute force, greedy, implementation

Beauty of the mountains

brute force, data structures, implementation, math, number theory

Turtle and an Incomplete Sequence

bitmasks, brute force, constructive algorithms, greedy, implementation, math

Turtle and an Infinite Sequence

bitmasks, math

Field Division (easy version)

data structures, math, sortings

Permutation of Rows and Columns

constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings

GCD-sequence

greedy, implementation, math, number theory

Sofia and the Lost Operations

constructive algorithms, greedy