Kostya the Sculptor

data structures, hashing

Equalize the Remainders

data structures, greedy, implementation

Perfect Security

data structures, greedy, strings, trees

Searchlights

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

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Trash Problem

data structures, implementation

Another Sorting Problem

data structures, sortings, strings

New Year Snowmen

binary search, data structures, greedy

Blocking Elements

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

Restore the Permutation

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

Optimal Subsequences (Hard Version)

data structures, greedy

Danil and a Part-time Job

bitmasks, data structures, trees

Inconvenient Pairs

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

Empty Graph

binary search, constructive algorithms, data structures, greedy, shortest paths

Passable Paths (hard version)

data structures, dfs and similar, trees

Sereja and Algorithm

data structures, implementation

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Survey in Class

brute force, data structures, greedy, implementation, sortings

Robot Collisions

data structures, greedy, implementation, sortings

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Vanya and Triangles

brute force, combinatorics, data structures, geometry, math, sortings

Cheap Dinner

brute force, data structures, graphs, greedy, implementation, sortings, two pointers

Maximum Xor Secondary

data structures, implementation, two pointers

Numbers on Tree

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

Beautiful Lyrics

data structures, greedy, strings

Imbalanced Array

data structures, divide and conquer, dsu, sortings

GCD Counting

data structures, dfs and similar, dp, number theory, trees

Remove Extra One

brute force, data structures, math

Alyona and a tree

binary search, data structures, dfs and similar, graphs, trees

CGCDSSQ

brute force, data structures, math

Planets

binary search, data structures, graphs, shortest paths

New Year Concert

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

Yet Another Problem

binary search, bitmasks, constructive algorithms, data structures

The Bakery

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

Ciel and Gondolas

data structures, divide and conquer, dp

Pokémon Army (hard version)

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

Too Easy Problems

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

Subsequences

data structures, dp

Progressions Covering

data structures, greedy

Mail Stamps

data structures, dfs and similar, graphs, implementation

Omkar and Medians

data structures, greedy, implementation

Matrix

combinatorics, data structures, implementation

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Discrete Centrifugal Jumps

data structures, dp, graphs

Preparing for Merge Sort

binary search, data structures

One-Dimensional Battle Ships

binary search, data structures, greedy, sortings

Clique Problem

data structures, dp, greedy, implementation, sortings

Restore Permutation

binary search, data structures, greedy, implementation

Remainder Problem

brute force, data structures, implementation

Buy Low Sell High

constructive algorithms, data structures, greedy

String Coloring (hard version)

data structures, dp

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

Frog Traveler

data structures, dfs and similar, dp, graphs, shortest paths, two pointers

Nearest Excluded Points

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

Pair of Numbers

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

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Reset K Edges

binary search, data structures, dfs and similar, graphs, greedy, trees

Desktop Rearrangement

data structures, greedy, implementation

Too Many Segments (hard version)

data structures, greedy, sortings

Irreducible Anagrams

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

Recommendations

data structures, greedy, sortings

Omsk Metro (simple version)

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

Maximum Submatrix 2

data structures, dp, implementation, sortings

Erase and Extend (Hard Version)

binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers

Burenka and Traditions (hard version)

data structures, dp, greedy

Clear the Multiset

data structures, divide and conquer, dp, greedy

Little Elephant and Cards

binary search, data structures

Buy a Ticket

data structures, graphs, shortest paths

Bash and a Tough Math Puzzle

data structures, number theory

Dominant Indices

data structures, dsu, trees

After Training

data structures, implementation, math

Berserk Monsters

brute force, data structures, dsu, implementation, math

Ones and Twos

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

New Year Tree

bitmasks, data structures, trees

Permutation Graph

binary search, constructive algorithms, data structures, divide and conquer, greedy, shortest paths

The Fair Nut and the Best Path

data structures, dp, trees

Milking cows

data structures, greedy

Meta-set

brute force, combinatorics, data structures, hashing, math

Vessels

data structures, dsu, implementation, trees

Rating Compression

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

Holes

data structures, dsu

Medium Design

brute force, data structures, dp, greedy, sortings

Up the Strip (simplified version)

brute force, data structures, dp, math, number theory

Legacy

data structures, graphs, shortest paths

Choosing flowers

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

Water Tree

data structures, dfs and similar, graphs, trees

Max GEQ Sum

binary search, constructive algorithms, data structures, divide and conquer, implementation, two pointers

Old Floppy Drive

binary search, data structures, math

Permutation Restoration

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

Array Stabilization (GCD version)

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

Range and Partition

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

Misha and Forest

constructive algorithms, data structures, greedy, sortings, trees

Difference Array

brute force, data structures, implementation, sortings

XOR Construction

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

A Simple Task

data structures, sortings, strings

Bear and Blocks

binary search, data structures, dp, math

Years

data structures, sortings

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Petya and Array

data structures, divide and conquer, two pointers

Molly's Chemicals

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