Difference Array

brute force, data structures, implementation, sortings

Mark and Lightbulbs

combinatorics, constructive algorithms, greedy, math, sortings

Mark the Photographer

greedy, sortings

Virus

greedy, implementation, sortings

Yet Another Problem About Pairs Satisfying an Inequality

binary search, data structures, dp, greedy, sortings

Permutation Restoration

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

PermutationForces II

brute force, combinatorics, greedy, sortings, trees, two pointers

Promo

greedy, sortings

2^Sort

data structures, dp, sortings, two pointers

All Distinct

greedy, sortings

Number of Groups

data structures, dfs and similar, dsu, graphs, greedy, sortings

Count the Trains

binary search, data structures, greedy, sortings

Lex String

brute force, greedy, implementation, sortings, two pointers

Patchouli's Magical Talisman

bitmasks, constructive algorithms, greedy, sortings

Sanae and Giant Robot

binary search, brute force, data structures, dsu, greedy, sortings

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

Linguistics

greedy, implementation, sortings, strings

Circular Local MiniMax

constructive algorithms, greedy, sortings

Traps

constructive algorithms, greedy, sortings

Column Swapping

brute force, constructive algorithms, greedy, implementation, sortings

MCMF?

data structures, flows, graphs, greedy, sortings, two pointers

Unordered Swaps

constructive algorithms, dfs and similar, graphs, greedy, math, sortings, trees

AND Sorting

bitmasks, constructive algorithms, sortings

Double Sort

implementation, sortings

Maximum Crossings (Hard Version)

data structures, divide and conquer, sortings

Longest Strike

data structures, greedy, implementation, sortings, two pointers

Eating Queries

binary search, greedy, sortings

Equal Candies

greedy, math, sortings

A-B-C Sort

constructive algorithms, implementation, sortings

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Consecutive Points Segment

brute force, math, sortings

Prof. Slim

greedy, implementation, sortings

Triple

implementation, sortings

Social Distance

greedy, math, sortings

Tree Infection

binary search, greedy, sortings, trees

Array Cloning Technique

constructive algorithms, greedy, sortings

Drone Photo

combinatorics, math, sortings

Ice Cream Shop

brute force, implementation, sortings

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

For Gamers. By Gamers.

binary search, brute force, greedy, math, sortings

Parametric MST

binary search, constructive algorithms, graphs, greedy, math, sortings

Make Equal With Mod

constructive algorithms, math, number theory, sortings

Good Pairs

math, sortings

Minimal String Xoration

bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings

Alice and the Cake

data structures, greedy, implementation, sortings

Maximum Cake Tastiness

brute force, greedy, implementation, sortings

Rescheduling the Exam

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

Weight of the System of Nested Segments

greedy, hashing, implementation, sortings

Weird Sum

combinatorics, data structures, geometry, math, matrices, sortings

Quality vs Quantity

brute force, constructive algorithms, greedy, sortings, two pointers

Anonymity Is Important

binary search, brute force, data structures, dsu, greedy, sortings

Repetitions Decoding

constructive algorithms, implementation, sortings

Great Sequence

brute force, greedy, sortings

Odd Swap Sort

data structures, math, sortings

Minimize Inversions Number

data structures, greedy, math, sortings

Sorting Parts

brute force, sortings

Cars

2-sat, constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Paint the Middle

dp, greedy, sortings, two pointers

Download More RAM

brute force, greedy, sortings

Spaceship Crisis Management

binary search, data structures, geometry, sortings

Not Sitting

games, greedy, sortings

Equidistant Letters

constructive algorithms, sortings

Binary Spiders

bitmasks, data structures, implementation, math, sortings, trees

Elementary Particles

brute force, greedy, sortings

Palindromes Coloring

binary search, greedy, sortings, strings

Game on Ranges

brute force, dfs and similar, implementation, sortings

Set or Decrease

binary search, brute force, greedy, sortings

Berland Music

data structures, greedy, math, sortings

New School

binary search, data structures, dp, greedy, implementation, sortings

Unusual Minesweeper

binary search, dfs and similar, dsu, greedy, sortings

MEX and Increments

constructive algorithms, data structures, dp, greedy, implementation, math, sortings

New Year's Problem

binary search, greedy, sortings

Trader Problem

data structures, dsu, greedy, sortings

Polycarp and Sums of Subsequences

math, sortings

Paprika and Permutation

binary search, greedy, math, sortings

Forbidden Subsequence

constructive algorithms, greedy, sortings, strings

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

Divan and a New Project

constructive algorithms, sortings

Absent Remainder

greedy, implementation, sortings

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Messages

brute force, dp, greedy, probabilities, sortings

The Cells on the Paper

binary search, implementation, sortings

Banquet Preparations 2

greedy, sortings, two pointers

Blue-Red Permutation

greedy, math, sortings

Minimum Extraction

brute force, sortings

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

Array Equalizer

binary search, greedy, implementation, math, number theory, sortings, two pointers

Reverse Sort

greedy, sortings

Difficult Mountain

data structures, dp, greedy, sortings

Optimal Insertion

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

Hemose Shopping

constructive algorithms, dsu, math, sortings

Gamer Hemose

binary search, greedy, math, sortings

Two Arrays

greedy, math, sortings

Omkar and Tours

data structures, divide and conquer, sortings, trees

Shifting Sort

implementation, sortings

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Another Sorting Problem

data structures, sortings, strings

Slay the Dragon

binary search, greedy, sortings, ternary search

Swaps

greedy, math, sortings