Target Infection

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

XOR Transformations (Easy Version)

bitmasks, brute force, implementation, sortings

Signs of Prefix Sums

brute force, constructive algorithms, dfs and similar, dp, implementation

Array Replacement

greedy, sortings

Permutation Cuts

combinatorics, implementation, math

Construct an Array (Easy Version)

dfs and similar, implementation, sortings

Anya Loves Trees!

dfs and similar, dp, greedy, trees, trees

A Bit Odd

data structures, games, greedy, math

Elections in Saransk (easy version)

number theory

Friendly Gifts

brute force, dp

Good Schedule

dp, greedy

Me When Median Problem

binary search, greedy

It Just Keeps Going Sideways

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

Interval Mod

constructive algorithms, dp, greedy, math

Worldwide Playlist

math

Simons and Beating Peaks

data structures, data structures, divide and conquer, dp, dp, greedy, implementation, trees

Divisibility Game

brute force, games, games, games, greedy, number theory, number theory

Recollect Numbers

constructive algorithms

Lost Civilization (Hard Version)

data structures, dp

BattleCows

data structures, divide and conquer, implementation

Medical Parity

dp, strings

Xmas or Hysteria

constructive algorithms, greedy, implementation, math

Siga ta Kymata

constructive algorithms, greedy, implementation, math

Make Connected

brute force, implementation

MAD Interactive Problem

constructive algorithms, implementation, interactive

Division Versus Addition

games, greedy, math

Grid Counting

combinatorics, implementation, math

Game on Array

games, greedy

For the Champion

constructive algorithms, interactive, math

Arithmetics Competition

binary search, data structures, greedy, sortings, ternary search

Make a Palindrome

greedy, sortings, two pointers

Minimize Fixed Points

constructive algorithms, number theory

Manhattan Pairs

constructive algorithms, geometry, greedy, math, sortings

Red Light, Green Light (Easy version)

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

Smilo and Minecraft

brute force, constructive algorithms, greedy

Reachability and Tree

constructive algorithms, dfs and similar, graphs, trees

Fewer Batteries

binary search, dfs and similar, dp, graphs, greedy, hashing

Hacking Numbers (Medium Version)

constructive algorithms, interactive, math, number theory

Unpleasant Strings

binary search, dp, greedy, strings

Wonderful City

dp, implementation

Chimpanzini Bananini

data structures, implementation, math

Dining Hall

data structures, greedy, implementation, sortings

Simple Permutation

constructive algorithms, number theory

Even String

brute force, combinatorics, dp, math, strings

Best Runner

*special problem

Goodbye, Banker Life

2-sat, bitmasks, combinatorics, constructive algorithms, fft, math, number theory

Trapmigiano Reggiano

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

Skibidus and Capping

combinatorics, math, number theory

Skibidus and Slay

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

Refined Product Optimality

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

Fix Flooded Floor

constructive algorithms, dp, graphs

Maximum modulo equality

data structures, divide and conquer, math, number theory

Scrambled Scrabble

brute force, greedy

Medium Demon Problem (easy version)

dfs and similar, graph matchings, graphs, implementation, trees

Drunken Maze

brute force, dfs and similar, graphs, shortest paths

Shohag Loves GCD

constructive algorithms, greedy, math, number theory

Penchick and Desert Rabbit

binary search, data structures, dfs and similar, dp, dsu, greedy, implementation, two pointers

QED's Favorite Permutation

data structures, implementation, sortings

New Rating

binary search, data structures, dp, greedy

The Endspeaker (Easy Version)

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

Skipping

binary search, dp, graphs, shortest paths

Tree Pruning

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

Message Transmission Error (hard version)

hashing, string suffix structures, strings, two pointers

Firefly's Queries

bitmasks, data structures, flows, math

Iris and Game on the Tree

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

Ruler (hard version)

binary search, interactive, ternary search

Bouquet (Hard Version)

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

Novice's Mistake

brute force, constructive algorithms, implementation, math, strings

Beautiful Array

greedy, math, number theory, sortings

Maximize the Largest Component (Easy Version)

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

Magnitude (Hard Version)

combinatorics, dp, greedy, math

Swap Dilemma

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

Beauty of the mountains

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

Paint the Tree

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

Cat, Fox and Double Maximum

constructive algorithms, greedy, implementation, math, sortings

XOUR

data structures, dsu, sortings

Game on Tree (Medium)

dfs and similar, dp, games, trees

Minimizing the Sum

dp, implementation

Long Inversions

brute force, greedy, implementation, sortings

0, 1, 2, Tree!

bitmasks, brute force, greedy, implementation, trees

Tandem Repeats?

brute force, strings, two pointers

Binary Search

binary search, constructive algorithms, greedy

Bessie's Birthday Cake (Hard Version)

geometry, greedy, math

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

Find a Mine

binary search, constructive algorithms, geometry, greedy, interactive, math

Chat Screenshots

combinatorics, dfs and similar, graphs

Lexicographically Largest

binary search, constructive algorithms, data structures, greedy, sortings

Mathematical Problem

brute force, constructive algorithms, geometry, math

Triangle Construction

greedy, math

Maximum And Queries (easy version)

binary search, bitmasks, brute force, greedy

Yet Another Monster Fight

binary search, dp, greedy, implementation, math

Colorful Grid

constructive algorithms

Ones and Twos

binary search, data structures, divide and conquer, math, two pointers

Neutral Tonality

constructive algorithms, greedy, sortings, two pointers

Doremy's Connecting Plan

constructive algorithms, greedy, math, sortings

Medium Design

brute force, data structures, dp, greedy, sortings

Look Back

bitmasks, greedy

Minimum Maximum Distance

dfs and similar, dp, graphs, shortest paths, trees

Sum of XOR Functions

bitmasks, combinatorics, divide and conquer, dp, math

Mad City

dfs and similar, dsu, games, graphs, shortest paths, trees