Array Queries

brute force, data structures, dp

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

The Contest

data structures, dp, greedy

Fire

dp, sortings

Searchlights

binary search, brute force, data structures, dp, implementation, sortings, two pointers

Wish I Knew How to Sort

dp, math, probabilities

XOR Inverse

bitmasks, data structures, divide and conquer, dp, greedy, math, sortings, strings, trees

Different Arrays

brute force, dp, implementation

Divide by Three

dp, greedy, math, number theory

GCD Counting

data structures, dfs and similar, dp, number theory, trees

Accommodation

brute force, dp, greedy, implementation

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Little Pony and Harmony Chest

bitmasks, brute force, dp

Chocolate Bar

brute force, dp

Keep the Average High

dp, greedy, math

String Coloring (hard version)

data structures, dp

505

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

Generate a String

dfs and similar, dp

Chip Move

brute force, dp, math

Number of Subsequences

combinatorics, dp, strings

Square Subsets

bitmasks, combinatorics, dp, math

Appleman and Tree

dfs and similar, dp, trees

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Choosing flowers

binary search, brute force, data structures, dfs and similar, dp, greedy, sortings, two pointers

Red-Green Towers

dp

The Hard Work of Paparazzi

dp

Domino for Young

dp, greedy, math

Book of Evil

dfs and similar, divide and conquer, dp, trees

Tree Shuffling

dfs and similar, dp, greedy, trees

Minimax Problem

binary search, bitmasks, dp

Clear the String

dp

Prefixes and Suffixes

dp, string suffix structures, strings, two pointers

Yet Another Yet Another Task

data structures, dp, implementation, two pointers

Odd-Even Subsequence

binary search, dp, dsu, greedy, implementation

The least round way

dp, math

Short Permutation Problem

combinatorics, dp, fft, math

Game on Tree (Hard)

dfs and similar, dp, games, trees

Comb

data structures, dp

Dot

dp, games

Spiral Maximum

brute force, dp

Annual Ants' Gathering

dfs and similar, dp, greedy, trees

Merge Not Sort

constructive algorithms, dp

Solitaire

dfs and similar, dp

Optical Experiment

binary search, data structures, dp

Maxim and Restaurant

dp, math, probabilities

Table

bitmasks, combinatorics, dp, math

Beautiful Decomposition

dp, games, greedy, number theory

Little Elephant and Elections

brute force, combinatorics, dp

Phone Talks

*special problem, dp, sortings

Palindromes

dp, strings

Permutation Sum

bitmasks, combinatorics, dp, implementation, meet-in-the-middle

Camels

dp

Insertion Sort

data structures, dp, implementation, math

Numbers

combinatorics, dp

Two Strings

data structures, dp, strings

Police Station

dp, graphs, shortest paths

Photo Processing

binary search, dp

Coprocessor

dfs and similar, dp, graphs, greedy

Palindrome

constructive algorithms, dp

Minesweeper 1D

dp, implementation

Teodor is not a liar!

data structures, dp

Skills

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

Pawn

dp

Symmetric and Transitive

combinatorics, dp, math

Jeff and Furik

combinatorics, dp, probabilities

Connected Components

data structures, dfs and similar, dp, dsu

Cunning Gena

bitmasks, dp, greedy, sortings

Counting Rectangles is Fun

brute force, divide and conquer, dp

Decoding Genome

dp, matrices

Spy Syndrome 2

data structures, dp, hashing, implementation, sortings, string suffix structures, strings

Inna and Dima

dfs and similar, dp, graphs, implementation

Array Without Local Maximums

dp

Completely Searching for Inversions

dfs and similar, dp, graphs

Subsequences (hard version)

dp, strings

Credit Card

data structures, dp, greedy, implementation

Ciel and Duel

dp, flows, greedy

Bank Hacking

constructive algorithms, data structures, dp, trees

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Flag

brute force, combinatorics, dp, implementation

New Year and Fireworks

brute force, data structures, dfs and similar, dp, implementation

Bottles

dp

Alyona and Strings

dp, strings

Bookshelves

bitmasks, dp, greedy

Division + LCP (easy version)

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

Lucky Tree

dp, dsu, trees

Vladik and Memorable Trip

dp, implementation

Hills

dp

Score of a Tree

bitmasks, combinatorics, dfs and similar, dp, math, probabilities, trees

Music Festival

binary search, data structures, dp, greedy, sortings

Good Trip

combinatorics, dp, math, probabilities

Once Again...

constructive algorithms, dp, matrices

Image Preview

binary search, brute force, dp, two pointers

Two Chess Pieces

dfs and similar, dp, greedy, trees

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Counting Factorizations

combinatorics, divide and conquer, dp, math, number theory

Feed Cats

data structures, dp, sortings

Sum of Progression

brute force, data structures, dp, implementation, math

Stars Drawing (Hard Edition)

binary search, dp, greedy

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Shuffling Songs

bitmasks, dfs and similar, dp, graphs, hashing, implementation, strings