Vasya and Beautiful Arrays

brute force, dp, number theory

Flying Sort (Easy Version)

dp, greedy, two pointers

Game on Sum (Easy Version)

combinatorics, dp, games, math

Sleepy Game

dfs and similar, dp, games, graphs

Number of Components

combinatorics, data structures, dp, math

The Human Equation

greedy, implementation

MEX vs DIFF

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

Graph Coloring

dfs and similar, dp, graphs

Friends and Subsequences

binary search, data structures

Bracket Walk

data structures, greedy, strings

XOR Break --- Solo Version

bitmasks, constructive algorithms, greedy

More Wrong

divide and conquer, interactive

Common Number

binary search, combinatorics, dp, math

Decryption

constructive algorithms, implementation, math, number theory

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

Best Pair

binary search, brute force, implementation

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Pencils and Boxes

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

GCD Queries

constructive algorithms, interactive, number theory

Recovering BST

brute force, dp, math, number theory, trees

Array and Operations

flows, graph matchings, number theory

Complete the Projects (easy version)

greedy

Beautiful Mirrors

data structures, dp, math, probabilities

Mishka and Interesting sum

data structures

Monocarp and the Set

combinatorics, data structures, math

Arena

combinatorics, dp, math

Longest Subsequence

brute force, math, number theory

Xor Tree

binary search, bitmasks, data structures, divide and conquer, dp, trees

Money Transfers

constructive algorithms, data structures, greedy, sortings

Optimal Partition

data structures, dp

Soldier and Traveling

flows, graphs, math

Height All the Same

combinatorics, constructive algorithms, math, matrices

01 Tree

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

Watching Fireworks is Fun

data structures, dp, math

Water Balance

data structures, geometry, greedy

Divan and Kostomuksha (easy version)

dp, number theory

Divisibility by 25

brute force, greedy

Challenges in school №41

brute force, constructive algorithms, games, graphs, greedy, implementation, sortings

Segment Tree

data structures, dsu, graphs, trees

Anton and Tree

dfs and similar, dp, trees

Rarity and New Dress

dfs and similar, dp, implementation, shortest paths

Martial Arts Tournament

binary search, brute force, greedy, math

Array Partition

binary search, data structures, greedy, two pointers

Guess The Maximums

binary search, implementation, interactive, math

Destroying Roads

constructive algorithms, graphs, shortest paths

Valid Sets

dfs and similar, dp, math, trees

Boring Segments

data structures, sortings, trees, two pointers

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Present

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

Olya and Energy Drinks

data structures, dfs and similar, graphs, shortest paths

Two Arrays

binary search, brute force, combinatorics, constructive algorithms, dp, two pointers

We Need More Bosses

dfs and similar, graphs, trees

The Winter Hike

constructive algorithms, greedy, math

Ehab's Last Corollary

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

Magic Gems

dp, math, matrices

Segment Intersections

brute force, greedy, implementation, math

Cut

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

Reducing Delivery Cost

brute force, graphs, shortest paths

Trash Problem

data structures, implementation

Nearest Beautiful Number (hard version)

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

Subsequences of Length Two

dp, strings

Binary Median

binary search, bitmasks, brute force, constructive algorithms

Swaps Again

constructive algorithms, implementation, sortings

Gift Set

binary search, greedy, math, ternary search

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

Pokémon Army (hard version)

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

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Xor-Paths

bitmasks, brute force, dp, meet-in-the-middle

Restorer Distance

binary search, greedy, math, sortings, ternary search

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

Kalila and Dimna in the Logging Industry

dp, geometry

Remainder Problem

brute force, data structures, implementation

Weights Distributing

brute force, graphs, greedy, shortest paths, sortings

Round Subset

dp, math

Coloring Edges

constructive algorithms, dfs and similar, graphs

Police Stations

constructive algorithms, dfs and similar, dp, graphs, shortest paths, trees

Civilization

dfs and similar, dp, dsu, ternary search, trees

New Year Tree

bitmasks, data structures, trees

Omkar and Circle

brute force, dp, games, greedy

Errich-Tac-Toe (Easy Version)

constructive algorithms, math

Ancient Berland Circus

geometry, math

The Number of Pairs

dp, math, number theory

Water Tree

data structures, dfs and similar, graphs, trees

Array Shrinking

dp, greedy

Connected Components?

data structures, dfs and similar, dsu, graphs

Zero Remainder Sum

dp

Blood Cousins

binary search, data structures, dfs and similar, trees

A and B and Lecture Rooms

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

Max Median

binary search, data structures, dp

Maximum Value

binary search, math, sortings, two pointers

Ciel the Commander

constructive algorithms, dfs and similar, divide and conquer, greedy, trees

Minimum spanning tree for each edge

data structures, dfs and similar, dsu, graphs, trees

Tree Painting

dfs and similar, dp, trees

Ant colony

data structures, math, number theory

Non-decimal sum

*special problem

Truncatable primes

*special problem

Divisibility Check

*special problem

Date Change

*special problem