No Prime Differences

constructive algorithms, math, number theory

Minimize Permutation Subarrays

constructive algorithms, math

Blackboard List

constructive algorithms, math

Bracket Coloring

constructive algorithms, greedy

Best Binary String

constructive algorithms, greedy

Grasshopper on a Line

constructive algorithms, math

Twin Clusters

bitmasks, brute force, constructive algorithms, math, probabilities

Ksyusha and Chinchilla

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

Ira and Flamenco

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

Flipper

brute force, constructive algorithms, greedy

Red-Blue Operations (Hard Version)

binary search, constructive algorithms, greedy, implementation, math

Array merging

constructive algorithms, greedy

Twin Permutations

constructive algorithms

Divisible Array

constructive algorithms, math

Copium Permutation

constructive algorithms, data structures, greedy

Bus Routes

binary search, constructive algorithms, dfs and similar, greedy, trees

Unique Palindromes

constructive algorithms, math, strings

A-characteristic

combinatorics, constructive algorithms, math

Super-Permutation

constructive algorithms, math

The Fox and the Complete Tree Traversal

constructive algorithms, dp, implementation, math, trees

Indivisible

constructive algorithms

Toy Machine

constructive algorithms, games, implementation

Fish Graph

brute force, constructive algorithms, dfs and similar, graphs

Grid Reconstruction

constructive algorithms, greedy

Ian Visits Mary

constructive algorithms, geometry, number theory

OH NO1 (-2-3-4)

constructive algorithms, graphs, math

Between

constructive algorithms, dfs and similar, graphs, greedy

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Search in Parallel

constructive algorithms, greedy, sortings

Unmysterious Language

*special problem, constructive algorithms, strings

Not a Geometry Problem

*special problem, *special problem, constructive algorithms, geometry, math

Trivial Conjecture

*special problem, constructive algorithms, math, number theory

Umka and a Long Flight

constructive algorithms, implementation, math

Restore the Array

constructive algorithms, greedy

Candies

constructive algorithms, math, number theory

Binary String Sorting

constructive algorithms, greedy

Sum on Subarrays

constructive algorithms, greedy, math

Sequence Master

brute force, constructive algorithms, math

Mex Master

constructive algorithms, greedy

The Very Beautiful Blanket

bitmasks, constructive algorithms

Unforgivable Curse (hard version)

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

Unforgivable Curse (easy version)

brute force, constructive algorithms, dsu, graphs, greedy, strings

City Union

constructive algorithms, dfs and similar, dsu, geometry, greedy, implementation, math

Equalize by Divide

brute force, constructive algorithms, greedy, math

Shocking Arrangement

constructive algorithms, greedy, math

Li Hua and Chess

constructive algorithms, greedy, interactive

Li Hua and Pattern

constructive algorithms, greedy

Li Hua and Maze

constructive algorithms, flows, graphs, greedy, implementation

Blocking Chips

binary search, constructive algorithms, dfs and similar, greedy, trees

Not Dividing

constructive algorithms, greedy, math

Dora and Search

constructive algorithms, data structures, two pointers

Fedya and Array

constructive algorithms, math

Tokens on Graph

constructive algorithms, dfs and similar, graphs, shortest paths

Vlad and a Pair of Numbers

bitmasks, constructive algorithms

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Matching Numbers

constructive algorithms, greedy, math

Sum of Two Numbers

constructive algorithms, greedy, implementation, math, probabilities

Inverse Transformation

constructive algorithms, implementation, math

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Exponential Equation

constructive algorithms, math

Letter Exchange

constructive algorithms

Matrix of Differences

constructive algorithms, math

Make it Beautiful

constructive algorithms, math, sortings

Diverse Coloring

constructive algorithms, trees

Equal Frequencies

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

Bit Guessing Game

binary search, bitmasks, constructive algorithms, interactive

Hayato and School

constructive algorithms, greedy

The Game of the Century

constructive algorithms, graphs, shortest paths

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Boris and His Amazing Haircut

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

MKnez's ConstructiveForces Task

constructive algorithms, math

Hall of Fame

constructive algorithms, greedy, strings

Another Wine Tasting Event

combinatorics, constructive algorithms, math, strings

Train Splitting

constructive algorithms, graphs, greedy

Teamwork

constructive algorithms, greedy, math

Laboratory on Pluto

constructive algorithms, dp, greedy, math

Gardener and the Array

bitmasks, constructive algorithms

Gardener and the Capybaras (hard version)

constructive algorithms, greedy

Gardener and the Capybaras (easy version)

brute force, constructive algorithms, implementation

Maximum Permutation

constructive algorithms

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Same Count One

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

Ice and Fire

constructive algorithms, dp, greedy

Coloring

constructive algorithms, greedy, math

Add Plus Minus Sign

constructive algorithms, math

King's Puzzle

constructive algorithms

Jumbled Trees

constructive algorithms, math

Football

constructive algorithms

Amazing Trick

constructive algorithms, graph matchings, math, probabilities

Copy of a Copy of a Copy

constructive algorithms, dfs and similar, graphs, implementation, sortings

Absolute Sorting

constructive algorithms, math

Different Differences

constructive algorithms, greedy, math

Hossam and Friends

binary search, constructive algorithms, dp, two pointers

Koxia, Mahiru and Winter Festival

constructive algorithms

Koxia and Game

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

Koxia and Permutation

constructive algorithms

Lucky Permutation

constructive algorithms, dfs and similar, graphs, greedy

Elemental Decompress

constructive algorithms, greedy, implementation, sortings