The 67th Tree Problem

constructive algorithms, implementation, trees

Find the Zero

constructive algorithms, interactive

Alternating Path

constructive algorithms, dfs and similar, graph matchings, graphs, graphs, graphs, graphs

Minesweeper

*special problem, constructive algorithms, greedy

Table Cut

constructive algorithms, greedy, implementation

Sub-RBS (Easy Version)

combinatorics, constructive algorithms, dp, greedy, strings, two pointers

Sorting Game

constructive algorithms, games, greedy

XOR Convenience (Easy Version)

bitmasks, constructive algorithms, math

The Curse of the Frog

constructive algorithms, greedy, math

Tree Coloring (Easy Version)

constructive algorithms, dfs and similar, greedy, trees

Blackslex and Penguin Civilization

bitmasks, constructive algorithms, greedy, math

XOR Array

constructive algorithms, math

Kanade's Perfect Multiples

brute force, constructive algorithms, greedy, number theory

Rae Taylor and Trees (hard version)

binary search, constructive algorithms, data structures, dp, dsu, greedy, implementation, trees

Cyclic Merging

constructive algorithms, greedy

Beautiful Palindromes

constructive algorithms, greedy, schedules

Loyalty

constructive algorithms, greedy, sortings, two pointers

Split

constructive algorithms, greedy, math

Meximum Array 2

constructive algorithms, greedy, implementation, math

Symmetrical Polygons

constructive algorithms, geometry, greedy, implementation, sortings

Rabbits

constructive algorithms, dp, greedy, implementation

Max Sum OR (Easy Version)

bitmasks, constructive algorithms, divide and conquer, greedy, trees

Wrong Binary Search

binary search, constructive algorithms

Max Tree

constructive algorithms, dfs and similar, graphs, greedy

Replace with Occurrences

constructive algorithms

Add 0 or K

constructive algorithms, math, number theory

Double Perspective

constructive algorithms, dp, dsu, graphs, greedy, sortings

Subset Multiplication

constructive algorithms, greedy, math, number theory

Binary String Battle

constructive algorithms, games, greedy

Divine Tree

constructive algorithms, greedy, math, sortings, trees

A Good Problem

bitmasks, constructive algorithms, math

Make It Permutation

constructive algorithms

Gellyfish and Flaming Peony

constructive algorithms, dp, math, number theory

Good Start

constructive algorithms, math

Creating a Schedule

constructive algorithms, data structures, greedy, implementation, sortings

Racing

constructive algorithms, greedy

Hacking Numbers (Easy Version)

bitmasks, constructive algorithms, interactive, math, number theory

SUMdamental Decomposition

bitmasks, constructive algorithms, greedy, implementation, math

Maximum Subarray Sum

binary search, constructive algorithms, dp, implementation, math

Mex in the Grid

constructive algorithms, implementation

Trulimero Trulicina

constructive algorithms

Asuna and the Mosquitoes

constructive algorithms, greedy, math

Serval and The Formula

bitmasks, constructive algorithms, dp, greedy

Serval and Final MEX

constructive algorithms, implementation

Arcology On Permafrost

binary search, brute force, constructive algorithms, greedy, math

You Soared Afar With Grace

constructive algorithms, data structures, greedy, implementation

Breach of Faith

constructive algorithms, greedy, math, sortings

Array Recoloring

constructive algorithms, greedy

Do You Love Your Hero and His Two-Hit Multi-Target Attacks?

binary search, brute force, constructive algorithms, dp, geometry, greedy, math

Creating Keys for StORages Has Become My Main Skill

bitmasks, constructive algorithms, greedy

Skibidus and Rizz

constructive algorithms, greedy, strings

Remove the Ends

brute force, constructive algorithms, dp, greedy

Customer Service

brute force, constructive algorithms, graph matchings, greedy, math, sortings

Cost of the Array

brute force, constructive algorithms, greedy, math

Trip to the Olympiad

bitmasks, constructive algorithms, greedy, math

Palindromic Subsequences

brute force, constructive algorithms, math

The Trail

brute force, constructive algorithms, greedy, math, two pointers

Adrenaline Rush

constructive algorithms

MEX Cycle

brute force, constructive algorithms, greedy, implementation

pspspsps

brute force, constructive algorithms, graph matchings, implementation

Beautiful Array

constructive algorithms, math

Ordered Permutations

bitmasks, combinatorics, constructive algorithms, greedy, math, two pointers

Reverse the Rivers

binary search, constructive algorithms, data structures, greedy

Alya and Permutation

bitmasks, constructive algorithms, math

Darius' Wisdom

constructive algorithms, greedy, implementation, sortings

Trapped in the Witch's Labyrinth

constructive algorithms, dfs and similar, graphs, implementation

Penchick and BBQ Buns

constructive algorithms, math, number theory

Action Figures

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

Black Cells

binary search, brute force, constructive algorithms, greedy

Concatenation of Arrays

constructive algorithms, greedy, math, sortings

Adjust The Presentation (Easy Version)

constructive algorithms, greedy

Password Cracking

constructive algorithms, interactive, strings

Turtle and Good Pairs

constructive algorithms, greedy, sortings, strings

Absolute Zero

constructive algorithms, greedy, math

Array Craft

constructive algorithms, greedy

Increasing Sequence with Fixed OR

bitmasks, constructive algorithms, greedy

Corner Twist

constructive algorithms, greedy, implementation, math

Permutation of Rows and Columns

constructive algorithms, data structures, greedy, hashing, implementation, math, matrices, sortings

Sofia and the Lost Operations

constructive algorithms, greedy

Earning on Bets

binary search, combinatorics, constructive algorithms, number theory

Manhattan Permutations

constructive algorithms, data structures, greedy, implementation, math

Ingenuity-2

constructive algorithms, greedy, implementation

Cells Arrangement

constructive algorithms

Nene's Magical Matrix

constructive algorithms, greedy, math

Arrow Path

brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths

Informatics in MAC

constructive algorithms

Turtle Tenacity: Continual Mods

constructive algorithms, greedy, math, number theory, sortings

Sasha and the Casino

binary search, brute force, constructive algorithms, games, greedy, math

Klever Permutation

constructive algorithms, math, two pointers

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Find B

constructive algorithms, greedy

Forming Triangles

combinatorics, constructive algorithms, math, sortings

Training Before the Olympiad

constructive algorithms, games, greedy, implementation, math

Heavy Intervals

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

Make Almost Equal With Mod

bitmasks, constructive algorithms, math, number theory

Jumping Through Segments

binary search, constructive algorithms

Removal of Unattractive Pairs

constructive algorithms, greedy, math, strings

Set To Max (Easy Version)

brute force, constructive algorithms, greedy

Theofanis' Nightmare

constructive algorithms, greedy

StORage room

bitmasks, brute force, constructive algorithms, greedy