Sum of Digits of Sums

*special problem, binary search, data structures

Parallel Swaps Sort

constructive algorithms, data structures

Heavy Intervals

constructive algorithms, data structures, dsu, greedy, math, sortings

YetnotherrokenKeoard

data structures, implementation, strings

Maximize The Value

data structures, sortings

Field Should Not Be Empty

brute force, data structures, divide and conquer

Cyclic MEX

data structures, implementation, math, two pointers

Beautiful Tree

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

Tree Queries

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

Set To Max (Hard Version)

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

Array Game

binary search, brute force, data structures, sortings, two pointers

Babysitting

2-sat, binary search, data structures, graphs, trees

Trees and XOR Queries Again

data structures, dfs and similar, divide and conquer, graphs, implementation, math, trees

Collapsing Strings

data structures, strings, trees

Robot Queries

binary search, data structures, dp, implementation

Local Deletions

binary search, data structures, implementation

Unusual Entertainment

data structures, dfs and similar, dsu, shortest paths, sortings, trees, two pointers

Sofia and Strings

data structures, greedy, sortings, strings, two pointers

Permutation Sorting

data structures, sortings

Ones and Twos

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

Two Characters, Two Colors

binary search, data structures, dp, flows, greedy

Infinite Card Game

binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, greedy, sortings, two pointers

XOR Construction

bitmasks, constructive algorithms, data structures, math, string suffix structures, trees

Colorful Constructive

constructive algorithms, data structures, greedy

A Growing Tree

data structures, dfs and similar, trees

Doremy's Average Tree

data structures, dp, greedy, trees

Doremy's Drying Plan (Hard Version)

data structures, dp

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

Split

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

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

Diamond Theft

data structures, greedy

Monocarp and the Set

combinatorics, data structures, math

Medium Design

brute force, data structures, dp, greedy, sortings

You Are So Beautiful

data structures

In Love

data structures, greedy

Anya and the Mysterious String

binary search, data structures

Last Man Standing

brute force, data structures, number theory

wxhtzdy ORO Tree

binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees

Iva & Pav

binary search, bitmasks, data structures, greedy

Reverse Madness

data structures, greedy

Clubstep

binary search, brute force, data structures, greedy, trees

Ball-Stackable

constructive algorithms, data structures, dp, trees

Data Structures Fan

binary search, bitmasks, data structures, dp

Standard Graph Problem

data structures, graphs, greedy, trees

MEXanization

data structures

Colorful Table

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

LIS?

data structures, greedy, implementation

Salyg1n and the MEX Game

constructive algorithms, data structures, games, greedy, interactive

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

Grouped Carriages

binary search, data structures, dp, flows, greedy

Freak Joker Process

binary search, data structures, sortings

Exotic Queries

data structures, implementation, sortings

Guess Game

bitmasks, data structures, games, math, probabilities, sortings, strings, trees

Matrix Cascade

brute force, constructive algorithms, data structures, dp, greedy, math

The Great Equalizer

binary search, data structures, math, sortings

Kolya and Movie Theatre

constructive algorithms, data structures, greedy

Flower City Fence

binary search, data structures, implementation, sortings

Queries for the Array

data structures, dfs and similar, implementation, strings, trees

Evaluate RBS

data structures, geometry, implementation, math, sortings

Fast Travel Text Editor

data structures, dfs and similar, graphs, shortest paths

Game on Permutation

data structures, dp, games, greedy

Teleportation in Byteland

data structures, dfs and similar, divide and conquer, graphs, shortest paths, trees

Andrey and Escape from Capygrad

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

Rollbacks (Hard Version)

data structures, interactive, trees

Rollbacks (Easy Version)

brute force, data structures, dfs and similar, trees

Trees and Segments

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

Sum and Product

binary search, data structures, math

To Become Max

binary search, brute force, data structures, dp

Panda Meetups

data structures, dp, flows

Rivalries

constructive algorithms, data structures, greedy

Ina of the Mountain

data structures, dp, greedy, math

Vlad and the Mountains

binary search, data structures, dsu, graphs, implementation, sortings, trees, two pointers

The Morning Star

combinatorics, data structures, geometry, implementation, math, sortings

XOR Partition

binary search, bitmasks, data structures, divide and conquer, greedy, trees

Max to the Right of Min

binary search, data structures, divide and conquer, dp, dsu, two pointers

Binary String Copying

binary search, brute force, data structures, hashing, strings

Vika and the Bridge

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

The Boss's Identity

binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings

Professor Higashikata

data structures, dsu, greedy, implementation, strings

Rudolf and the Another Competition

constructive algorithms, data structures, dp, greedy, sortings

Rating System

binary search, brute force, data structures, dp, dsu, greedy, math, two pointers

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Tree Weights

bitmasks, constructive algorithms, data structures, dfs and similar, implementation, math, matrices, number theory, trees

Min Cost Permutation (Hard Version)

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

Omsk Metro (hard version)

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

Omsk Metro (simple version)

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

Tracking Segments

binary search, brute force, data structures, two pointers

Tenzing and Triangle

data structures, dp, geometry, greedy, math

Fill the Matrix

data structures, greedy, math

Pairs of Segments

data structures, greedy, sortings, two pointers

Character Blocking

data structures, hashing, implementation

Ball Sorting

data structures, dp, sortings

Bracket Walk

data structures, greedy, strings

Editorial for Two

binary search, data structures, greedy, implementation

MEX of LCM

binary search, data structures, implementation, math, number theory

Survey in Class

brute force, data structures, greedy, implementation, sortings

Ira and Flamenco

combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers

The Third Grace

data structures, dp

Bully Sort

data structures, math

Hits Different

data structures, dp, implementation, math