Orac and LCM

data structures, math, number theory

Phoenix and Memory

data structures, dfs and similar, graphs, greedy

Phoenix and Beauty

constructive algorithms, data structures, greedy, sortings

Game with Segments

*special problem, data structures, games

Dune II: Battle For Arrakis

*special problem, data structures, greedy, math

Train Tracks

data structures, trees

Restore the Permutation by Sorted Segments

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

Constant Palindrome Sum

brute force, data structures, greedy, two pointers

Multiple Testcases

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

Nastya and CBS

brute force, data structures, hashing

Nastya and Strange Generator

brute force, data structures, greedy, implementation

Journey

data structures, divide and conquer, graphs, trees

Robots on a Grid

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

Three Blocks Palindrome (hard version)

brute force, data structures, dp, two pointers

Three Blocks Palindrome (easy version)

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

Strange Function

binary search, data structures, dp, greedy

Eugene and an array

binary search, data structures, implementation, two pointers

No Monotone Triples

data structures

Dreamoon Likes Strings

constructive algorithms, data structures

Drazil Likes Heap

constructive algorithms, data structures, greedy, implementation

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Bombs

data structures, two pointers

Pair of Topics

binary search, data structures, sortings, two pointers

Frog Jumps

binary search, data structures, dfs and similar, greedy, implementation

Median Mountain Range

data structures

Present

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

Treeland and Viruses

data structures, dfs and similar, dp, shortest paths, trees

Reachable Strings

data structures, hashing, strings

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Journey Planning

data structures, dp, greedy, math, sortings

Battalion Strength

data structures, divide and conquer, probabilities

Concatenation with intersection

data structures, hashing, strings, two pointers

Skyscrapers (hard version)

data structures, dp, greedy

Skyscrapers (easy version)

brute force, data structures, dp, greedy

Autocompletion

data structures, dfs and similar, dp

Moving Points

data structures, divide and conquer, implementation, sortings

Recommendations

data structures, greedy, sortings

Cow and Fields

binary search, data structures, dfs and similar, graphs, greedy, shortest paths, sortings

Animal Observation (hard version)

data structures, dp, greedy

Animal Observation (easy version)

data structures, dp

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

Segment tree or Fenwick?

data structures

Nanosoft

binary search, data structures, dp, implementation

Water Balance

data structures, geometry, greedy

Falling Blocks

*special problem, data structures

Movie Fan

*special problem, data structures, greedy, implementation, sortings

String Coloring (hard version)

data structures, dp

Yet Another Walking Robot

data structures, implementation

Permutation Separation

data structures, divide and conquer

MEX maximizing

data structures, greedy, implementation, math

NEKO's Maze Game

data structures, dsu, implementation

Cartesian Tree

data structures

Irreducible Anagrams

binary search, constructive algorithms, data structures, strings, two pointers

Mind Control

brute force, data structures, implementation

Messenger Simulator

data structures

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

Delete a Segment

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

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

Friends and Gifts

constructive algorithms, data structures, math

The Cake Is a Lie

constructive algorithms, data structures, dfs and similar, graphs

Stack of Presents

data structures, implementation

Segment Tree

data structures, dsu, graphs, trees

Berry Jam

data structures, dp, greedy, implementation

Let's Play the Words?

data structures, hashing, implementation, math

Beautiful Rectangle

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

Portals

data structures, dp, greedy, implementation, sortings

Number of Components

data structures

K Integers

binary search, data structures

Spaceship Solitaire

data structures, greedy, implementation

Decreasing Debts

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

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

The Contest

data structures, dp, greedy

Yet Another Monster Killing Problem

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

Tree Queries

data structures, probabilities, trees

Antenna Coverage

data structures, dp, greedy, sortings

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

Voting (Hard Version)

binary search, data structures, greedy

Voting (Easy Version)

data structures, dp, greedy

Trip to Saint Petersburg

data structures

Too Many Segments (hard version)

data structures, greedy, sortings

Queue in the Train

data structures, greedy, implementation

Adilbek and the Watering System

data structures, greedy, sortings

Balanced Distribution

data structures, dp, greedy

Balanced Playlist

binary search, data structures, implementation

Balanced Tunnel

data structures, sortings, two pointers

Alice and the Unfair Game

binary search, data structures, dp, dsu