Ant Man

dp, graphs, greedy

LaIS

data structures, dp, greedy

Square-free division (hard version)

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

Animal Observation (easy version)

data structures, dp

Turtles

dp, matrices

Presents in Bankopolis

dp, graphs, shortest paths

Helping Hiasat

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

Natasha, Sasha and the Prefix Sums

combinatorics, dp, math, number theory

Special Matrices

combinatorics, dp

Sorting Pancakes

dp

Egor in the Republic of Dagestan

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

Tournament

brute force, dp, greedy

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Long Way Home

data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths

Changing Brackets

constructive algorithms, data structures, dp, greedy

Vlad and the Nice Paths (hard version)

binary search, combinatorics, data structures, dp, math, two pointers

Memory and Scores

combinatorics, dp, math

Non-Intersecting Subpermutations

combinatorics, dp, implementation, math

Salazar Slytherin's Locket

bitmasks, dp

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

Tree

binary search, dp, trees

On the Bench

combinatorics, dp

Substitutes in Number

dp

Chopping Carrots (Hard Version)

brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers

Greg and Friends

combinatorics, dp, graphs, shortest paths

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Yet Another Inversions Problem

combinatorics, data structures, dp, implementation, math, number theory

Maximum Monogonosity

brute force, dp, math

Light Bulbs (Easy Version)

brute force, combinatorics, dfs and similar, dp, dsu, graphs, math, trees

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

The Maximum Subtree

dfs and similar, dp, graphs, trees

Vasya and Magic Matrix

dp, math, probabilities

Hamiltonian Spanning Tree

dfs and similar, dp, graph matchings, greedy, trees

The Maths Lecture

dp, implementation

Towers

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

Node Pairs

dp, graphs, math, number theory

Array Beauty

dp

Railguns

brute force, dfs and similar, dp, graphs

Korney Korneevich and XOR (hard version)

binary search, brute force, dp, greedy, two pointers

New School

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

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

GCD Counting

divide and conquer, dp, dsu, number theory, trees

The Three Little Pigs

combinatorics, dp, fft, math

Yet Another Array Counting Problem

binary search, data structures, divide and conquer, dp, flows, math, trees

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Destroy it!

dp, implementation, sortings

Equidistant Vertices

brute force, combinatorics, dfs and similar, dp, trees

Selling Souvenirs

binary search, dp, greedy, ternary search

Two Bracket Sequences

dp, strings, two pointers

Dreamoon and Strings

dp, strings

Wrong Answer on test 233 (Easy Version)

dp

Yet another 2D Walking

dp

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Range Sorting (Hard Version)

binary search, data structures, dp, greedy

Rock Is Push

binary search, dp

Digits

dp, math, number theory

Broken robot

dp, math, probabilities

Nastia Plays with a Tree

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

Pig and Palindromes

combinatorics, dp

Pluses everywhere

combinatorics, dp, math, number theory

Ela and the Wiring Wizard

brute force, dp, graphs, greedy, implementation, shortest paths

Prefix Function Queries

dfs and similar, dp, hashing, string suffix structures, strings, trees

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

William The Oblivious

bitmasks, data structures, dp, matrices

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Inverse Coloring

combinatorics, dp, math

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Three Religions

dp, implementation, strings

Two Merged Sequences

dp, greedy

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Lucky Subsequence

combinatorics, dp, math

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Compress String

dp, strings

Another Sith Tournament

bitmasks, dp, math, probabilities

Optimal Insertion

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

Vlad and the Nice Paths (easy version)

combinatorics, dp, math

Short Colorful Strip

combinatorics, dfs and similar, dp

Explosions?

binary search, data structures, dp, greedy, math

Tree Queries (Hard Version)

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

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

Dog Snacks

binary search, dfs and similar, dp, greedy, trees

Field expansion

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

Extreme Extension

dp, greedy, math, number theory

Phoenix and Berries

brute force, dp, greedy, math

Game on Sum (Hard Version)

combinatorics, dp, games, math

Star MST

combinatorics, dp, graph matchings, math

Steps to One

dp, math, number theory, probabilities

Sorting Books

data structures, dp, greedy

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Birds

dp

Nastya and Unexpected Guest

dfs and similar, dp, graphs, shortest paths

Array GCD

dp, greedy, number theory

The way home

binary search, data structures, dp, graphs, greedy, shortest paths, sortings

Combinatorics Problem

brute force, combinatorics, dp

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

LIS of Sequence

data structures, dp, greedy, hashing, math