Subsequences of Length Two

dp, strings

Two Different

constructive algorithms, divide and conquer

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Searchlights

binary search, brute force, data structures, dp, implementation, sortings, two pointers

Egor in the Republic of Dagestan

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

Discrete Centrifugal Jumps

data structures, dp, graphs

Three Sequences

constructive algorithms, data structures, greedy, math

Fixed Point Removal

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

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Reverse and Swap

binary search, bitmasks, data structures

Divide Square

data structures, geometry, implementation, sortings

Clear the Multiset

data structures, divide and conquer, dp, greedy

Yet Another Segments Subset

data structures, dp, graphs, sortings

Weights Division (hard version)

binary search, dfs and similar, greedy, sortings, trees, two pointers

Weights Division (easy version)

data structures, dfs and similar, greedy, trees

Controversial Rounds

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

Two Types of Spells

binary search, data structures, greedy, implementation, math, sortings

Monster Invaders

dp, greedy, implementation

Boboniu Walks on Graph

brute force, dfs and similar, graphs, hashing

Rarity and New Dress

dfs and similar, dp, implementation, shortest paths

Omkar and Landslide

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

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

505

bitmasks, brute force, constructive algorithms, dp, greedy, implementation

Calendar Ambiguity

math, number theory

Segment Intersections

brute force, greedy, implementation, math

Captain Flint and Treasure

data structures, dfs and similar, graphs, greedy, implementation, trees

Village (Maximum)

*special problem, dfs and similar, trees

Village (Minimum)

*special problem, dp, greedy, trees

Graph

*special problem, binary search, dfs and similar, dp, math, ternary search

Columns Swaps

2-sat, dfs and similar, dsu, graphs, implementation

Removing Leaves

data structures, greedy, implementation, trees

Directing Edges

constructive algorithms, dfs and similar, graphs

Koa and the Beach (Hard Version)

constructive algorithms, dp, greedy, implementation

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

Merging Towers

data structures, dsu, implementation, trees

Berserk And Fireball

constructive algorithms, greedy, implementation, math, two pointers

New Passenger Trams

binary search, brute force, data structures, sortings, two pointers

Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Inversion SwapSort

constructive algorithms, greedy, sortings

Cyclic Shifts Sorting

brute force, constructive algorithms, implementation, sortings

Reading Books (hard version)

data structures, greedy, implementation, sortings, ternary search, two pointers

Network Coverage

binary search, constructive algorithms, data structures, greedy

Sum of Digits

brute force, constructive algorithms, dp, greedy

Omkar and Circle

brute force, dp, games, greedy

Asterism (Hard Version)

binary search, combinatorics, dp, math, number theory, sortings

The Hidden Pair (Easy Version)

binary search, dfs and similar, graphs, interactive, shortest paths, trees

Binary Subsequence Rotation

binary search, constructive algorithms, data structures, greedy

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

DeadLee

data structures, dfs and similar, greedy, implementation, sortings

Ski Accidents

constructive algorithms, graphs, greedy

Flying Sort (Hard Version)

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

Flying Sort (Easy Version)

dp, greedy, two pointers

Two Arrays

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

Two Divisors

constructive algorithms, math, number theory

Swaps Again

constructive algorithms, implementation, sortings

Ehab's Last Corollary

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

Tree Shuffling

dfs and similar, dp, greedy, trees

Guess The Maximums

binary search, implementation, interactive, math

Johnny and Megan's Necklace

binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs

Binary Median

binary search, bitmasks, brute force, constructive algorithms

Modular Stability

combinatorics, math, number theory

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

Are You Fired?

constructive algorithms, data structures, greedy, implementation

Restorer Distance

binary search, greedy, math, sortings, ternary search

Summoning Minions

constructive algorithms, dp, flows, graph matchings, greedy, sortings

Graph Coloring

dfs and similar, dp, graphs

Not So Simple Polygon Embedding

binary search, brute force, geometry, math

Decreasing Heights

brute force, dp

Orac and Game of Life

dfs and similar, graphs, implementation, shortest paths

Orac and Medians

constructive algorithms, greedy, math

Phoenix and Berries

brute force, dp, greedy, math

Two IP Cameras

*special problem, math, number theory

Dune II: Battle For Arrakis

*special problem, data structures, greedy, math

Monopole Magnets

constructive algorithms, dfs and similar, dsu, graphs

Restore the Permutation by Sorted Segments

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

Weights Distributing

brute force, graphs, greedy, shortest paths, sortings

Placing Rooks

combinatorics, fft, math

Nastya and Unexpected Guest

dfs and similar, dp, graphs, shortest paths

Perfect Triples

bitmasks, brute force, constructive algorithms, divide and conquer, math

Kaavi and Magic Spell

dp, strings

Robots on a Grid

data structures, dfs and similar, dsu, graphs, greedy, matrices

Strange Function

binary search, data structures, dp, greedy

Divisor Paths

combinatorics, graphs, greedy, math, number theory

Kate and imperfection

greedy, implementation, math, number theory, sortings, two pointers

Road to 1600

brute force, constructive algorithms

Challenges in school №41

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

Independent Set

dfs and similar, dp, trees

Height All the Same

combinatorics, constructive algorithms, math, matrices

Drazil Likes Heap

constructive algorithms, data structures, greedy, implementation

Make k Equal

greedy

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Infinite Path

brute force, dfs and similar, graphs, math, number theory

Bombs

data structures, two pointers

Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

Instant Noodles

graphs, hashing, math, number theory

Present

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

Reachable Strings

data structures, hashing, strings

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Team Building

bitmasks, dp, greedy, sortings