Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Matrix

combinatorics, data structures, implementation

Omkar and Medians

data structures, greedy, implementation

Mail Stamps

data structures, dfs and similar, graphs, implementation

Subsequences

data structures, dp

Progressions Covering

data structures, greedy

Too Easy Problems

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

Pokémon Army (hard version)

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

Ciel and Gondolas

data structures, divide and conquer, dp

The Bakery

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

Yet Another Problem

binary search, bitmasks, constructive algorithms, data structures

New Year Concert

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

Planets

binary search, data structures, graphs, shortest paths

CGCDSSQ

brute force, data structures, math

Alyona and a tree

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

Remove Extra One

brute force, data structures, math

GCD Counting

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

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Numbers on Tree

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

Beautiful Lyrics

data structures, greedy, strings

Maximum Xor Secondary

data structures, implementation, two pointers

Cheap Dinner

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

Vanya and Triangles

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

The Strongest Build

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

Survey in Class

brute force, data structures, greedy, implementation, sortings

Robot Collisions

data structures, greedy, implementation, sortings

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

Passable Paths (hard version)

data structures, dfs and similar, trees

Sereja and Algorithm

data structures, implementation

Empty Graph

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

Inconvenient Pairs

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

Danil and a Part-time Job

bitmasks, data structures, trees

Optimal Subsequences (Hard Version)

data structures, greedy

Another Sorting Problem

data structures, sortings, strings

Blocking Elements

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

Restore the Permutation

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

New Year Snowmen

binary search, data structures, greedy

Trash Problem

data structures, implementation

XOR Inverse

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

Searchlights

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

Perfect Security

data structures, greedy, strings, trees

Equalize the Remainders

data structures, greedy, implementation

Kostya the Sculptor

data structures, hashing

Pairs of Segments

data structures, greedy, sortings, two pointers

The Contest

data structures, dp, greedy

R2D2 and Droid Army

binary search, data structures, two pointers

Hanging Hearts

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

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

Cut

binary search, data structures, dp, graphs, number theory, two pointers

Cut and Stick

binary search, data structures, greedy, implementation, sortings

Multithreading

data structures, greedy, implementation

Same Sum Blocks (Hard)

data structures, greedy

Array Queries

brute force, data structures, dp

Big Brush

constructive algorithms, data structures, greedy, implementation

Subsegments

data structures, implementation

Lena and Matrix

data structures, dp, geometry, shortest paths

Psychos in a Line

data structures, implementation

Tokitsukaze and Meeting

data structures, implementation, math

Rescheduling the Exam

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

Robot in a Hallway

data structures, dp, greedy, implementation, ternary search

Physical Education Lessons

data structures, implementation, sortings

Olya and Energy Drinks

data structures, dfs and similar, graphs, shortest paths

Array Restoration

constructive algorithms, data structures

Arthur and Table

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

String Reconstruction

data structures, greedy, sortings, strings

Moving Points

data structures, divide and conquer, implementation, sortings

White Lines

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

Present

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

Copying Data

data structures

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Xor-MST

bitmasks, constructive algorithms, data structures

Cleaning

data structures, dp, greedy, math

Maximum Subarray

data structures, dp, greedy, two pointers

Babaei and Birthday Cake

data structures, dp

Reverse Sort Sum

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

Boring Segments

data structures, sortings, trees, two pointers

Hanoi Factory

brute force, data structures, dp, greedy, sortings

Array Partition

binary search, data structures, greedy, two pointers

Nested Segments

data structures, sortings

Balanced Playlist

binary search, data structures, implementation

The Fair Nut and Rectangles

data structures, dp, geometry

Missile Silos

data structures, dfs and similar, graphs, shortest paths

Kay and Snowflake

data structures, dfs and similar, dp, trees

Set To Max (Hard Version)

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

Playlist

data structures, dsu, implementation, shortest paths

Segment Tree

data structures, dsu, graphs, trees

Collapsing Strings

data structures, strings, trees

Polycarp's phone book

data structures, implementation, sortings

Lonely Mountain Dungeons

brute force, data structures, greedy, math, ternary search

Microcycle

data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees

Almost Difference

data structures, math

Li Hua and Tree

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

Report

data structures, sortings

Case of Fugitive

data structures, greedy, sortings

All Possible Digits

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

Riverside Curio

data structures, dp, greedy

Duff in the Army

data structures, trees

Koxia and Game

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

Water Balance

data structures, geometry, greedy

Robot Queries

binary search, data structures, dp, implementation