Copium Permutation

constructive algorithms, data structures, greedy

Two Centroids

data structures, dfs and similar, greedy, trees

Palindrome Partition

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

Range Sorting (Hard Version)

binary search, data structures, dp, greedy

Walk the Runway

bitmasks, brute force, data structures, dp, graphs, implementation, sortings

LuoTianyi and Cartridge

data structures, trees

LuoTianyi and the Function

data structures

LuoTianyi and XOR-Tree

data structures, dfs and similar, dp, dsu, greedy, trees

Magic Triples (Hard Version)

brute force, data structures, math, number theory

Magic Triples (Easy Version)

brute force, data structures, math, number theory

Willy-nilly, Crack, Into Release!

data structures, dp

Misha and Apples

brute force, data structures, dp, two pointers

Almost Increasing Subsequence

binary search, data structures, greedy

Chain Chips

data structures, dp, matrices

Balancing Weapons

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

Vlad and the Nice Paths (hard version)

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

M-tree

data structures, math, sortings, trees

Monsters

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

Traveling in Berland

binary search, data structures, graphs, greedy, implementation

Petya, Petya, Petr, and Palindromes

binary search, brute force, data structures, two pointers

Subsequence Addition (Easy Version)

brute force, data structures, dp, greedy, implementation, sortings

Odd Queries

data structures, implementation

Tree Master

brute force, data structures, dfs and similar, trees

There Should Be a Lot of Maximums

brute force, data structures, dfs and similar, dp, trees, two pointers

Place for a Selfie

binary search, data structures, geometry, math

Flow Control

data structures, dsu, implementation

A task for substrings

data structures, string suffix structures, strings

Gasoline prices

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

The way home

binary search, data structures, dp, graphs, greedy, shortest paths, sortings

Music Festival

binary search, data structures, dp, greedy, sortings

Buying gifts

data structures, greedy, sortings

Remove Two Letters

data structures, greedy, hashing, strings

Powering the Hero (hard version)

data structures, greedy

Powering the Hero (easy version)

data structures, greedy

Hot Start Up (hard version)

data structures, dp

Recent Actions

data structures, greedy, implementation, math

Three Sevens

brute force, data structures, greedy, implementation

Li Hua and Path

data structures, dfs and similar, divide and conquer, dsu, trees

Li Hua and Array

brute force, data structures, dsu, math, number theory, two pointers

Li Hua and Tree

brute force, data structures, dfs and similar, dp, implementation, trees

Maximum Subarray

data structures, dp, greedy, two pointers

Explosions?

binary search, data structures, dp, greedy, math

Tea Tasting

binary search, data structures, implementation

Labeling the Tree with Distances

data structures, dp, greedy, hashing, implementation, trees

Rebrending

brute force, data structures, divide and conquer, implementation

Velepin and Marketing

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

Dora and Search

constructive algorithms, data structures, two pointers

Fixed Prefix Permutations

binary search, bitmasks, data structures, hashing, math, sortings

Range Update Point Query

binary search, brute force, data structures

Matryoshkas

data structures, greedy, sortings

Sum Over Zero

data structures, dfs and similar, dp

Treasure Hunt

data structures, divide and conquer, two pointers

Codeforces Scoreboard

binary search, data structures, dp, geometry

Colorful Tree Again

brute force, data structures, trees

Monsters (hard version)

data structures, greedy

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Game of the Year

brute force, data structures, math, number theory

Rectangle Shrinking

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

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Josuke and Complete Graph

binary search, brute force, data structures, math, number theory

Boris and His Amazing Haircut

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

Least Prefix Sum

data structures, greedy

Comfortably Numb

bitmasks, data structures, divide and conquer, strings, trees

Crossing the Railways

data structures, dp

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Magician and Pigs (Hard Version)

binary search, brute force, data structures, implementation

Magician and Pigs (Easy Version)

brute force, data structures, implementation

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Hossam and (sub-)palindromic tree

brute force, data structures, dfs and similar, dp, strings, trees

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Two Subtrees

data structures, trees

Count Binary Strings

data structures, dp

Block Towers

data structures, greedy, sortings

Decomposition

binary search, brute force, data structures, divide and conquer, dp, two pointers

Project Manager

brute force, data structures, implementation

Doremy's Paint 2

data structures

Edge Queries

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

Incinerate

binary search, brute force, data structures, implementation, math, sortings

Good Pairs

binary search, data structures, dp

Binary Inversions

data structures, greedy, math

Advantage

data structures, implementation, sortings

Restore the Permutation

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

All Possible Digits

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

Decent Division

constructive algorithms, data structures

BinaryStringForces

constructive algorithms, data structures, dp

Bracket Cost

binary search, data structures, divide and conquer, dp, greedy, strings

Distance to the Path

data structures, dfs and similar, trees

Number Game

binary search, data structures, games, greedy, implementation

Yet Another Array Counting Problem

binary search, data structures, divide and conquer, dp, flows, math, trees

Zero-Sum Prefixes

brute force, data structures, dp, greedy, implementation

Yet Another Problem

binary search, bitmasks, constructive algorithms, data structures

Olympiad Training

binary search, data structures, dp, flows, geometry, implementation, sortings

Kazaee

data structures, hashing, probabilities

Antifibonacci Cut

bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math

Intersection and Union

data structures, dp, matrices, probabilities

Multi-Colored Segments

binary search, data structures, math, sortings

Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

MEX Tree Manipulation

data structures, trees

Hanging Hearts

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

Knowledge Cards

constructive algorithms, data structures