Mark and Lightbulbs

combinatorics, constructive algorithms, greedy, math, sortings

Mark the Dust Sweeper

constructive algorithms, greedy, implementation

Game of AI (easy version)

combinatorics, constructive algorithms, dp, fft, math

Mio and Lucky Array

constructive algorithms, fft, math, strings

Colouring Game

constructive algorithms, dp, games

Count Seconds

brute force, constructive algorithms, dp, graphs, implementation, math

Magical Array

constructive algorithms, hashing, implementation, math

Two 0-1 Sequences

constructive algorithms, greedy

Equate Multisets

constructive algorithms, data structures, greedy, math, number theory

Round Down the Price

constructive algorithms

Puzzle

constructive algorithms, dp, greedy

Serega the Pirate

brute force, constructive algorithms

Helping the Nature

constructive algorithms, data structures, greedy

Palindromic Numbers

constructive algorithms, implementation, math

Optimal Path

constructive algorithms, greedy, math

The Third Problem

combinatorics, constructive algorithms, math

Almost Ternary Matrix

bitmasks, constructive algorithms, matrices

The Third Three Number Problem

constructive algorithms, math

Equal Reversal

constructive algorithms, graphs, implementation, math

Fixed Point Guessing

binary search, constructive algorithms, interactive

Rising Sand

constructive algorithms, greedy, implementation

Too Many Constraints

2-sat, constructive algorithms, graphs, implementation

Coloring

brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math

Guess The String

binary search, constructive algorithms, interactive

awoo's Favorite Problem

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

Tree Recovery

brute force, constructive algorithms, dfs and similar, dsu, graphs, trees

Permutation Graph

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

Fishingprince Plays With Array

constructive algorithms, greedy, implementation, math

Ambiguous Dominoes

constructive algorithms, dfs and similar, graphs

Tree Queries (Hard Version)

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

Tree Queries (Easy Version)

brute force, constructive algorithms, dfs and similar, dp, greedy, trees

Paranoid String

constructive algorithms, greedy

Max GEQ Sum

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

Sum of Substrings

brute force, constructive algorithms, greedy, math, strings

Shoe Shuffling

constructive algorithms, greedy, implementation, two pointers

Print a Pedestal (Codeforces logo?)

constructive algorithms, greedy

ANDfinity

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Manipulating History

constructive algorithms, greedy, strings

Patchouli's Magical Talisman

bitmasks, constructive algorithms, greedy, sortings

Become Big For Me

combinatorics, constructive algorithms, greedy, math, number theory

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

Permutation Weight (Hard Version)

constructive algorithms, greedy

Permutation Weight (Easy Version)

constructive algorithms, dfs and similar, dsu

Bring Balance

brute force, constructive algorithms, greedy

Circular Local MiniMax

constructive algorithms, greedy, sortings

Hard Cut

constructive algorithms, dfs and similar, divide and conquer, math

Euclid Guess

constructive algorithms, flows, graph matchings, math, number theory

MEX vs DIFF

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

Traps

constructive algorithms, greedy, sortings

Column Swapping

brute force, constructive algorithms, greedy, implementation, sortings

Z mod X = C

constructive algorithms, math

Digit Minimization

constructive algorithms, games, math, strings

Unordered Swaps

constructive algorithms, dfs and similar, graphs, greedy, math, sortings, trees

Circular Spanning Tree

constructive algorithms, implementation, trees

LIS or Reverse LIS?

constructive algorithms, greedy, implementation, math

AND Sorting

bitmasks, constructive algorithms, sortings

Tokitsukaze and Two Colorful Tapes

constructive algorithms, dfs and similar, graphs, greedy

Breaking the Wall

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

A-B-C Sort

constructive algorithms, implementation, sortings

Number Transformation

constructive algorithms, math

Anti-Theft Road Planning

bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math

Zigu Zagu

constructive algorithms, data structures, greedy

Cross Xor

constructive algorithms, graphs, math, matrices

Checker for Array Shuffling

constructive algorithms, dfs and similar, graphs

Array Shuffling

constructive algorithms, graphs, greedy

notepad.exe

binary search, constructive algorithms, greedy, interactive

Cyclic Rotation

constructive algorithms, greedy, implementation, two pointers

Unequal Array

constructive algorithms, greedy, implementation

I love AAAB

constructive algorithms, implementation

Insert a Progression

brute force, constructive algorithms, greedy

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

Edge Elimination

constructive algorithms, dfs and similar, dp, trees

Half Queen Cover

constructive algorithms, math

Job Lookup

constructive algorithms, dp, shortest paths, trees

Interactive Treasure Hunt

brute force, constructive algorithms, geometry, interactive, math

Even Split

binary search, constructive algorithms, greedy, math

Connect the Points

brute force, constructive algorithms, geometry

GCD Guess

bitmasks, chinese remainder theorem, constructive algorithms, games, interactive, math, number theory

Array Cloning Technique

constructive algorithms, greedy, sortings

GCD vs LCM

constructive algorithms, math

Cross-Language Program

*special problem, constructive algorithms

Six Characters

*special problem, constructive algorithms, strings

Bottle Arrangements

constructive algorithms

Matrix and Shifts

brute force, constructive algorithms, greedy, implementation

AND-MEX Walk

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Reverse Sort Sum

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

Bit Flipping

bitmasks, constructive algorithms, greedy, strings

Red Versus Blue

constructive algorithms, greedy, implementation, math

Juju and Binary String

brute force, constructive algorithms, greedy, math

Shinju and the Lost Permutation

constructive algorithms, math

Marin and Photoshoot

constructive algorithms, implementation, math

Neighbour Ordering

constructive algorithms, graphs

Cycle Palindrome

constructive algorithms, graphs, math

Parametric MST

binary search, constructive algorithms, graphs, greedy, math, sortings

Equal Tree Sums

constructive algorithms, dfs and similar, math, trees

K-good

constructive algorithms, math, number theory

Make Equal With Mod

constructive algorithms, math, number theory, sortings

Three Minimums

combinatorics, constructive algorithms, divide and conquer, dp, fft, math

Sum of Matchings

brute force, combinatorics, constructive algorithms, dfs and similar, graph matchings, greedy, math

Prove Him Wrong

constructive algorithms, greedy