Tree Queries (Easy Version)

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

Love-Hate

bitmasks, brute force, dp, probabilities

Partition Game

binary search, data structures, divide and conquer, dp

Teodor is not a liar!

data structures, dp

Minesweeper 1D

dp, implementation

Partial Teacher

dp, graphs, greedy, implementation

Combinatorics Problem

brute force, combinatorics, dp

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Yaroslav and Two Strings

combinatorics, dp

PLEASE

combinatorics, dp, implementation, math, matrices

Gosha is hunting

brute force, data structures, dp, flows, math, probabilities, sortings

LionAge II

dp

Array GCD

dp, greedy, number theory

The way home

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

Nastya and Unexpected Guest

dfs and similar, dp, graphs, shortest paths

LIS of Sequence

data structures, dp, greedy, hashing, math

Birds

dp

Stripe 2

binary search, dp, sortings

Sorting Books

data structures, dp, greedy

Sums of Digits

dp, greedy, implementation

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Plus and xor

dp, greedy, math

Star MST

combinatorics, dp, graph matchings, math

Coprocessor

dfs and similar, dp, graphs, greedy

Phoenix and Berries

brute force, dp, greedy, math

Helga Hufflepuff's Cup

dp, trees

Steps to One

dp, math, number theory, probabilities

Field expansion

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

Girl Permutation

combinatorics, dp, math, number theory

Game on Sum (Hard Version)

combinatorics, dp, games, math

Extreme Extension

dp, greedy, math, number theory

Dog Snacks

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

Palindrome

constructive algorithms, dp

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

Running with Obstacles

*special problem, data structures, dp, greedy

Kim's Quest

bitmasks, combinatorics, dp

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Binary Table

bitmasks, brute force, divide and conquer, dp, fft, math

Olympiad in Programming and Sports

dp, flows, graphs, greedy

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

AlgoRace

dp, shortest paths

Two out of Three

dp

Sum

data structures, divide and conquer, dp, greedy

Optimal Insertion

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

Tree Queries (Hard Version)

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

Explosions?

binary search, data structures, dp, greedy, math

Short Colorful Strip

combinatorics, dfs and similar, dp

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

Another Sith Tournament

bitmasks, dp, math, probabilities

Vlad and the Nice Paths (easy version)

combinatorics, dp, math

Fibonacci army

*special problem, dp

Photo Processing

binary search, dp

Palindrome-less Arrays

combinatorics, divide and conquer, dp

Lucky Subsequence

combinatorics, dp, math

Compress String

dp, strings

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Three Religions

dp, implementation, strings

Inverse Coloring

combinatorics, dp, math

Shooting Gallery

dp, probabilities

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

William The Oblivious

bitmasks, data structures, dp, matrices

Game

brute force, dp, implementation

Ela and the Wiring Wizard

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

Alternating Tree

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

Mike and Geometry Problem

combinatorics, data structures, dp, geometry, implementation

Lizards and Basements 2

brute force, dp

Prefix Function Queries

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

Pig and Palindromes

combinatorics, dp

Beaver Game

dp, games, number theory

Nastia Plays with a Tree

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

Digits

dp, math, number theory

Pluses everywhere

combinatorics, dp, math, number theory

Rock Is Push

binary search, dp

Broken robot

dp, math, probabilities

Police Station

dp, graphs, shortest paths

Transitive Graph

dfs and similar, dp, dsu, graphs, implementation

Fedor and Essay

dfs and similar, dp, graphs, hashing, strings

Sereja and Subsequences

data structures, dp

Dreamoon and Strings

dp, strings

Little Elephant and LCM

binary search, combinatorics, dp, math

Inversions problem

brute force, dfs and similar, dp, meet-in-the-middle

Yet another 2D Walking

dp

Wrong Answer on test 233 (Easy Version)

dp

Selling Souvenirs

binary search, dp, greedy, ternary search

Range Sorting (Hard Version)

binary search, data structures, dp, greedy

Two Bracket Sequences

dp, strings, two pointers

Equidistant Vertices

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

Two Merged Sequences

dp, greedy

Destroy it!

dp, implementation, sortings

The Three Little Pigs

combinatorics, dp, fft, math

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Two Strings

data structures, dp, strings

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

Big Maximum Sum

data structures, dp, greedy, implementation, math, trees

GCD Counting

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

Cubes

binary search, dp, two pointers

Beaver

data structures, dp, greedy, hashing, strings, two pointers