Zublicanes and Mumocrates

dp, trees, two pointers

Economic Difficulties

data structures, dfs and similar, dp, flows, graphs, trees

One-X

combinatorics, dfs and similar, dp, math, trees

Numbers

dp, math, number theory

Gotta Go Fast

binary search, dp

Elevator

dp, graphs, shortest paths

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

Two Tanks

binary search, dp, implementation, math

Logical Expression

bitmasks, dp, shortest paths

Liar

binary search, dp, hashing, string suffix structures

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Tanks

dp, greedy, implementation

Mighty Rock Tower

brute force, combinatorics, dp, math, probabilities

Valera and Number

bitmasks, dp, math, probabilities

Michael and Charging Stations

binary search, dp, greedy

Greg and Caves

combinatorics, dp

Inversions problem

dp, probabilities

Exam Cheating

binary search, dp

Divisibility

constructive algorithms, dp, greedy, number theory

Kuro and Topological Parity

dp

Don't fear, DravDe is kind

binary search, data structures, dp, hashing

Four Divisors

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

Mausoleum

dp

Fibonacci String Subsequences

combinatorics, dp, matrices

PE Lesson

dp, math

Eleventh Birthday

combinatorics, dp, math

Cows and Cool Sequences

dp, math, number theory

Game with Strings

bitmasks, dp, games

Simplified Nonogram

bitmasks, dp, hashing, meet-in-the-middle

Crime Management

dp, graphs, matrices

Strange Calculation and Cats

dp, matrices

Little Elephant and Retro Strings

dp

Dima and Figure

dp

Masha and Cactus

dp, trees

The Great Julya Calendar

dp

Arrangement

bitmasks, dp

Expression

dp

Rectangles and Square

brute force, dp

Binary Key

dp, greedy, implementation

Plane of Tanks: Duel

brute force, dp, math, probabilities

Send the Fool Further! (hard)

dfs and similar, dp, math, trees

The Great Marathon

dp

Beautiful numbers

dp, number theory

Yet Another Minimization Problem

divide and conquer, dp

Make It One

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

Partition Game

binary search, data structures, divide and conquer, dp

Sorting Books

data structures, dp, 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

The Three Little Pigs

combinatorics, dp, fft, math

Array Beauty

dp

Towers

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

Maximum Monogonosity

brute force, dp, math

On the Bench

combinatorics, dp

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

Ant Man

dp, graphs, greedy

Square-free division (hard version)

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

Turtles

dp, matrices

Two Editorials

brute force, dp, greedy, sortings, two pointers

Genius

bitmasks, dp, graphs, number theory

Stringforces

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

Ray in the tube

data structures, divide and conquer, dp, math

President's Path

dp, graphs, shortest paths

Expected Destruction

combinatorics, dp, math, probabilities

Lucky Country

dp, dsu, graphs

Remembering Strings

bitmasks, dp

Ehab and the Expected GCD Problem

combinatorics, dp, math, number theory

Count Supersequences

combinatorics, dp, math

Distinctive Roots in a Tree

data structures, dfs and similar, dp, trees

Rescue Niwen!

dp, greedy, string suffix structures, strings

XOR Triangle

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

Bash Plays with Functions

brute force, combinatorics, dp, 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

Boxes and Balls

dp, implementation, math

LuoTianyi and XOR-Tree

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

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Move and Swap

dfs and similar, dp, greedy, trees

Legen...

data structures, dp, matrices, strings

Nanosoft

binary search, data structures, dp, implementation

Tokitsukaze and Permutations

dp, math

Removing Graph

brute force, dp, games, graphs, math

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Museums Tour

dp, graphs, implementation

Replace on Segment

dp, graph matchings

Up and Down the Tree

dfs and similar, dp, trees

Bear and Company

dp

Happy New Year

bitmasks, dp, implementation

Leaf Partition

dp, trees

Strange Function

binary search, data structures, dp, greedy

Cow and Treats

binary search, combinatorics, dp, greedy, implementation, math

Controversial Rounds

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

Levko and Strings

combinatorics, dp

Text Editor

brute force, dp, greedy, strings

Swap and Maximum Block

bitmasks, data structures, dfs and similar, divide and conquer, dp

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

Bags with Balls

combinatorics, dp, math, number theory

Roads in the Kingdom

dfs and similar, dp, graphs, trees

Independent Set

dfs and similar, dp, trees