Beautiful numbers

dp, number theory

Yet Another Minimization Problem

divide and conquer, dp

Tanya and Password

dfs and similar, graphs

Destiny

data structures, probabilities

Inversion SwapSort

constructive algorithms, greedy, sortings

Mass Change Queries

data structures

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Kuroni and the Punishment

math, number theory, probabilities

Hack it!

binary search, constructive algorithms, math

Jzzhu and Apples

constructive algorithms, number theory

AND Graph

bitmasks, dfs and similar, dsu, graphs

Make It One

bitmasks, combinatorics, dp, math, number theory, shortest paths

Sign on Fence

binary search, constructive algorithms, data structures

Ivan and Burgers

data structures, divide and conquer, greedy, math

Subset Sums

brute force, data structures

Partition Game

binary search, data structures, divide and conquer, dp

Fuzzy Search

bitmasks, brute force, fft

Sorting Books

data structures, dp, greedy

Kefa and Watch

data structures, hashing, strings

Ski Accidents

constructive algorithms, graphs, greedy

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Nastia Plays with a Tree

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

Frequency of String

hashing, string suffix structures, strings

Xor of 3

brute force, constructive algorithms, greedy, two pointers

The Three Little Pigs

combinatorics, dp, fft, math

Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

Array Beauty

dp

Towers

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

Maximum Monogonosity

brute force, dp, math

GukiZ and GukiZiana

binary search, data structures, implementation

On the Bench

combinatorics, dp

Sky Full of Stars

combinatorics, math

Artem and Array

data structures, greedy

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Egor in the Republic of Dagestan

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

Cheap Robot

binary search, dsu, graphs, shortest paths, trees

Turtles

dp, matrices

Square-free division (hard version)

data structures, dp, greedy, math, number theory, two pointers

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

Ant Man

dp, graphs, greedy

Bear and Bowling 4

binary search, data structures, divide and conquer, geometry, ternary search

REQ

data structures, number theory

Two Editorials

brute force, dp, greedy, sortings, two pointers

Genius

bitmasks, dp, graphs, number theory

Clues

combinatorics, graphs

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Team-Building

data structures, dfs and similar, dsu, graphs

Ray in the tube

data structures, divide and conquer, dp, math

Stringforces

binary search, bitmasks, brute force, dp, strings, two pointers

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

Expected Destruction

combinatorics, dp, math, probabilities

Alyona and towers

data structures

Lucky Country

dp, dsu, graphs

Mastermind

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

President's Path

dp, graphs, shortest paths

It's a bird! No, it's a plane! No, it's AaParsa!

constructive algorithms, graphs, shortest paths

Johnny and Megan's Necklace

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

Count Supersequences

combinatorics, dp, math

Joking (Easy Version)

binary search, constructive algorithms, interactive, ternary search

Oranges and Apples

constructive algorithms, sortings

Remembering Strings

bitmasks, dp

Ehab and the Expected GCD Problem

combinatorics, dp, math, number theory

Sanae and Giant Robot

binary search, brute force, data structures, dsu, greedy, sortings

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

Rescue Niwen!

dp, greedy, string suffix structures, strings

Strange Shuffle

binary search, brute force, constructive algorithms, interactive

What Is It?

constructive algorithms, greedy

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

Anton and School

bitmasks, constructive algorithms, implementation, math

XOR Triangle

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

Boxes and Balls

dp, implementation, math

Construct Matrix

constructive algorithms, math

Nanosoft

binary search, data structures, dp, implementation

Nastya and King-Shamans

binary search, data structures

Bash Plays with Functions

brute force, combinatorics, dp, number theory

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Power Tree

dfs and similar, dp, dsu, graphs, greedy, trees

Expected diameter of a tree

binary search, brute force, dfs and similar, dp, sortings, trees

Continuous City

bitmasks, constructive algorithms

LuoTianyi and XOR-Tree

data structures, dfs and similar, dp, dsu, greedy, trees

Reachable Strings

data structures, hashing, strings

Rollbacks (Easy Version)

brute force, data structures, dfs and similar, trees

Royal Questions

dsu, graphs, greedy

Tenzing and Tree

dfs and similar, greedy, shortest paths, sortings, trees

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Legen...

data structures, dp, matrices, strings

Defender of Childhood Dreams

bitmasks, constructive algorithms, divide and conquer

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Bipartite Checking

data structures, dsu, graphs

Move and Swap

dfs and similar, dp, greedy, trees

Alex and a TV Show

bitmasks, combinatorics, number theory

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Removing Graph

brute force, dp, games, graphs, math

Tokitsukaze and Permutations

dp, math

Falling Sand (Easy Version)

dfs and similar, graphs, greedy

Frogs and mosquitoes

data structures, greedy

LCM Sum (hard version)

brute force, data structures, math, number theory, two pointers

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Replace on Segment

dp, graph matchings