Permutation of Rows and Columns

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

Cat, Fox and Double Maximum

constructive algorithms, greedy, implementation, math, sortings

Cells Arrangement

constructive algorithms

Nene's Magical Matrix

constructive algorithms, greedy, math

Binary Search

binary search, constructive algorithms, greedy

Bitwise Operation Wizard

bitmasks, constructive algorithms, greedy, interactive, math

Find a Mine

binary search, constructive algorithms, geometry, greedy, interactive, math

Lexicographically Largest

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

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Mathematical Problem

brute force, constructive algorithms, geometry, math

Set To Max (Easy Version)

brute force, constructive algorithms, greedy

Alex's whims

constructive algorithms, graphs, greedy, shortest paths, trees

Colorful Grid

constructive algorithms

Neutral Tonality

constructive algorithms, greedy, sortings, two pointers

Smilo and Monsters

binary search, constructive algorithms, greedy, sortings, two pointers

Doremy's Connecting Plan

constructive algorithms, greedy, math, sortings

ABBC or BACB

constructive algorithms, greedy

Candy Party (Easy Version)

bitmasks, constructive algorithms, graphs, greedy, implementation, math

Matrix Cascade

brute force, constructive algorithms, data structures, dp, greedy, math

Kolya and Movie Theatre

constructive algorithms, data structures, greedy

Array Painting

constructive algorithms, greedy, two pointers

Ira and Flamenco

combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers

Search in Parallel

constructive algorithms, greedy, sortings

Umka and a Long Flight

constructive algorithms, implementation, math

Sum on Subarrays

constructive algorithms, greedy, math

Sequence Master

brute force, constructive algorithms, math

The Very Beautiful Blanket

bitmasks, constructive algorithms

Unforgivable Curse (hard version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, strings

Shocking Arrangement

constructive algorithms, greedy, math

Li Hua and Chess

constructive algorithms, greedy, interactive

Equal Frequencies

brute force, constructive algorithms, greedy, implementation, sortings, strings

Boris and His Amazing Haircut

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

Train Splitting

constructive algorithms, graphs, greedy

Same Count One

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

Coloring

constructive algorithms, greedy, math

Playoff

combinatorics, constructive algorithms, dp, greedy, math

Watch the Videos

binary search, constructive algorithms, two pointers

Make Nonzero Sum (hard version)

constructive algorithms, dp, greedy

Smaller

constructive algorithms, greedy, strings

Knowledge Cards

constructive algorithms, data structures

Card Game

combinatorics, constructive algorithms, dp, games

Ela and Crickets

constructive algorithms, games, implementation, math

Even-Odd XOR

bitmasks, constructive algorithms, greedy

Color the Picture

constructive algorithms, greedy, math

Doremy's IQ

binary search, constructive algorithms, greedy, implementation

Chopping Carrots (Easy Version)

binary search, brute force, constructive algorithms, greedy, number theory

Equate Multisets

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

Helping the Nature

constructive algorithms, data structures, greedy

The Third Problem

combinatorics, constructive algorithms, math

Fixed Point Guessing

binary search, constructive algorithms, interactive

Manipulating History

constructive algorithms, greedy, strings

Railway System

constructive algorithms, graphs, greedy, interactive, sortings

Traps

constructive algorithms, greedy, sortings

Cyclic Rotation

constructive algorithms, greedy, implementation, two pointers

Insert a Progression

brute force, constructive algorithms, greedy

Matrix and Shifts

brute force, constructive algorithms, greedy, implementation

Shinju and the Lost Permutation

constructive algorithms, math

Factorials and Powers of Two

bitmasks, brute force, constructive algorithms, dp, math

And Matching

bitmasks, constructive algorithms

MEX and Increments

constructive algorithms, data structures, dp, greedy, implementation, math, sortings

Singers' Tour

constructive algorithms, math

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

Weights Assignment For Tree Edges

constructive algorithms, trees

Moderate Modular Mode

constructive algorithms, math, number theory

The Number of Imposters

constructive algorithms, dfs and similar, dp, dsu, graphs

Bakry and Partitioning

bitmasks, constructive algorithms, dfs and similar, dp, graphs, trees

Vupsen, Pupsen and 0

constructive algorithms, math

Rings

constructive algorithms, math

Say No to Palindromes

brute force, constructive algorithms, dp, strings

Domino (easy version)

constructive algorithms, math

RPD and Rap Sheet (Easy Version)

bitmasks, constructive algorithms, interactive, math

Plus and Multiply

constructive algorithms, math, number theory

Another Problem About Dividing Numbers

constructive algorithms, math, number theory

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Baby Ehab Partitions Again

bitmasks, constructive algorithms, dp, math

Min Cost String

brute force, constructive algorithms, graphs, greedy, strings

Restoring the Permutation

constructive algorithms, implementation

3-Coloring

constructive algorithms, games, interactive

Balance the Bits

constructive algorithms, greedy

k-LCM (hard version)

constructive algorithms, math

Minimum Ties

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation, math

Basic Diplomacy

brute force, constructive algorithms, greedy, implementation

Fence Painting

brute force, constructive algorithms, greedy

Array Destruction

brute force, constructive algorithms, data structures, greedy, implementation, sortings

No More Inversions

constructive algorithms, math

Ceil Divisions

brute force, constructive algorithms, math, number theory

Binary Table (Easy Version)

constructive algorithms, implementation

Non-zero Segments

constructive algorithms, data structures, greedy, sortings

Sage's Birthday (hard version)

binary search, brute force, constructive algorithms, greedy, sortings, two pointers

Chocolate Bunny

constructive algorithms, interactive, math, two pointers

Link Cut Centroids

constructive algorithms, dfs and similar, graphs, trees

Binary String Reconstruction

2-sat, brute force, constructive algorithms, greedy

Binary String To Subsequences

constructive algorithms, data structures, greedy, implementation

Multiples of Length

constructive algorithms, greedy, number theory

Pinkie Pie Eats Patty-cakes

constructive algorithms, greedy, math, sortings

Prefix Flip (Hard Version)

constructive algorithms, data structures, implementation, strings, two pointers

Omkar and Baseball

constructive algorithms, math

Grid-00100

constructive algorithms, greedy, implementation

Even Picture

constructive algorithms

Codeforces Subsequences

brute force, constructive algorithms, greedy, math, strings