Messenger Simulator

data structures

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Hyperset

brute force, data structures, implementation

Fedya the Potter Strikes Back

data structures, strings

LCC

data structures, math, matrices, probabilities

Numbers on Tree

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

New Year and Social Network

data structures, graph matchings, graphs, math, trees

New Year and Conference

binary search, data structures, hashing, sortings

New Year and Ascent Sequence

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

Number of Components

data structures

Friends and Gifts

constructive algorithms, data structures, math

Stack of Presents

data structures, implementation

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

K Integers

binary search, data structures

Segment Tree

data structures, dsu, graphs, trees

Berry Jam

data structures, dp, greedy, implementation

Spaceship Solitaire

data structures, greedy, implementation

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Portals

data structures, dp, greedy, implementation, sortings

Beautiful Rectangle

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

Let's Play the Words?

data structures, hashing, implementation, math

Beautiful Mirrors

data structures, dp, math, probabilities

Beautiful Numbers

data structures, implementation, math, two pointers

Beautiful Mirrors with queries

data structures, probabilities

Economic Difficulties

data structures, dfs and similar, dp, flows, graphs, trees

Editor

data structures, implementation

Colored Tree

data structures, trees

Optimal Subsequences (Hard Version)

data structures, greedy

Optimal Subsequences (Easy Version)

data structures, greedy

Tree Queries

data structures, probabilities, trees

Antenna Coverage

data structures, dp, greedy, sortings

The Contest

data structures, dp, greedy

Yet Another Monster Killing Problem

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

Trip to Saint Petersburg

data structures

Voting (Hard Version)

binary search, data structures, greedy

Voting (Easy Version)

data structures, dp, greedy

Addition Robot

data structures, math, matrices

Performance Review

data structures

Find String in a Grid

data structures, dp, strings, trees

Even Path

data structures, implementation

Too Many Segments (hard version)

data structures, greedy, sortings

Queue in the Train

data structures, greedy, implementation

Alice and the Unfair Game

binary search, data structures, dp, dsu

Alice and the Doll

brute force, data structures, greedy, implementation

Balanced Distribution

data structures, dp, greedy

Balanced Playlist

binary search, data structures, implementation

Balanced Tunnel

data structures, sortings, two pointers

Adilbek and the Watering System

data structures, greedy, sortings

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Distinct Characters Queries

data structures

Social Network (hard version)

data structures, implementation

Wi-Fi

data structures, dp, greedy

Choose a Square

binary search, data structures, sortings

Gardener Alex

binary search, data structures

Workout plan

data structures, greedy

Guarding warehouses

data structures, geometry

Moving Walkways

data structures, greedy, math

Into Blocks (hard version)

data structures

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Koala and Notebook

data structures, dfs and similar, graphs, shortest paths, strings, trees

Forced Online Queries Problem

data structures, divide and conquer, dsu, graphs, trees

Sum Queries?

data structures, greedy, implementation, math

Feeling Good

bitmasks, data structures

Bad Sequence

data structures, greedy

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

Bad Prices

data structures, implementation

Red Blue Tree

data structures, implementation, trees

Let Them Slide

data structures, implementation

Restore Permutation

binary search, data structures, greedy, implementation

Indie Album

data structures, dfs and similar, hashing, string suffix structures, strings, trees

Remainder Problem

brute force, data structures, implementation

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

White Lines

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

Hotelier

brute force, data structures, implementation

You Are Given a WASD-string...

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

Welfare State

binary search, brute force, data structures, sortings

Magic Tree

*special problem, data structures, dp, trees

Dynamic Diameter

*special problem, data structures, dfs and similar, divide and conquer, trees

RGB Substring (hard version)

data structures, dp, implementation, two pointers

Culture Code

binary search, combinatorics, data structures, dp, shortest paths, sortings

Geometers Anonymous Club

data structures, geometry, math, sortings

OpenStreetMap

data structures, two pointers

The Awesomest Vertex

data structures, dfs and similar

Count The Rectangles

bitmasks, brute force, data structures, geometry, sortings

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Heidi and the Turing Test (Medium)

data structures

Candies!

data structures, dp, implementation, math

Subarray Sorting

data structures, sortings

Fedor Runs for President

data structures, dp, trees

Serge and Dining Room

binary search, data structures, graph matchings, greedy, implementation, math, trees

Valeriy and Deque

data structures, implementation

Exam in BerSU (hard version)

brute force, data structures, greedy, math

Irrigation

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

Maximum Sine

binary search, data structures, number theory

Beautiful Lyrics

data structures, greedy, strings

Nauuo and Bug

data structures

Nauuo and ODT

data structures

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers