2..3...4.... Wonderful! Wonderful!

combinatorics, dp, math

Maximum Element

combinatorics, dp, math

Bacterial Melee

brute force, combinatorics, dp, string suffix structures

Vasya and Array

dp

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Greedy Subsequences

data structures, dp, trees

Wooden Spoon

combinatorics, dp

Maximum Matching

bitmasks, brute force, dfs and similar, dp, graphs

Jee, You See?

bitmasks, combinatorics, dp

Unique Array

binary search, data structures, divide and conquer, dp, greedy

Cookies

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

Vasya and Maximum Matching

dp, trees

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Cutlet

data structures, dp

Flow Control

dfs and similar, dp, greedy, trees

Subsequences Galore

bitmasks, combinatorics, dp

One-X

combinatorics, dfs and similar, dp, math, trees

Zublicanes and Mumocrates

dp, trees, two pointers

Economic Difficulties

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

Numbers

dp, math, number theory

Gotta Go Fast

binary search, dp

Complete Mirror

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

Elevator

dp, graphs, shortest paths

Two Tanks

binary search, dp, implementation, math

Liar

binary search, dp, hashing, string suffix structures

Logical Expression

bitmasks, dp, shortest paths

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Mighty Rock Tower

brute force, combinatorics, dp, math, probabilities

Tanks

dp, greedy, implementation

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

PE Lesson

dp, math

Fibonacci String Subsequences

combinatorics, dp, matrices

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

Min-Fund Prison (Hard)

bitmasks, dfs and similar, dp, graphs, trees

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

Turtles

dp, matrices

Square-free division (hard version)

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

Ant Man

dp, graphs, greedy

Two Editorials

brute force, dp, greedy, sortings, two pointers

Genius

bitmasks, dp, graphs, number theory

Ray in the tube

data structures, divide and conquer, dp, math

Stringforces

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

Expected Destruction

combinatorics, dp, math, probabilities

Lucky Country

dp, dsu, graphs

President's Path

dp, graphs, shortest paths

Count Supersequences

combinatorics, dp, math

Remembering Strings

bitmasks, dp

Ehab and the Expected GCD Problem

combinatorics, dp, math, number theory

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

Boxes and Balls

dp, implementation, math

Nanosoft

binary search, data structures, dp, implementation

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

LuoTianyi and XOR-Tree

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

Legen...

data structures, dp, matrices, strings

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Move and Swap

dfs and similar, dp, greedy, trees

Removing Graph

brute force, dp, games, graphs, math

Tokitsukaze and Permutations

dp, math