Send Boxes to Alice (Hard Version)

constructive algorithms, greedy, math, number theory, ternary search, two pointers

Skyline Photo

data structures, divide and conquer, dp

New Year and Conference

binary search, data structures, hashing, sortings

Minimax

constructive algorithms, greedy, strings

Pictures with Kittens (hard version)

data structures, dp

Beautiful Subarrays

data structures, divide and conquer, strings, trees

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

Increase Sequence

combinatorics, dp

How Many Paths?

dfs and similar, dp, graphs, trees

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

Funny Substrings

data structures, hashing, implementation, matrices, strings

OpenStreetMap

data structures, two pointers

Euclid's nightmare

bitmasks, dfs and similar, dsu, graphs, greedy, math, sortings

Bear and Tree Jumps

dfs and similar, dp, trees

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

Counting Rhyme

dp, math, number theory

Potion Brewing Class

dfs and similar, math, number theory, trees

Tree with Small Distances

dp, graphs, greedy

Rectangular Congruence

constructive algorithms, number theory

Portals

data structures, dp, greedy, implementation, sortings

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

Array Collapse

data structures, divide and conquer, dp, trees

Berland Beauty

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

Pathwalks

data structures, dp, graphs

The LCMs Must be Large

bitmasks, brute force, constructive algorithms, math, number theory

ConstructOR

bitmasks, chinese remainder theorem, combinatorics, constructive algorithms, math, number theory

Domino (hard version)

constructive algorithms, implementation, math

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Game of Stones

bitmasks, dp, games

Speedrun

brute force, dfs and similar, dp, graphs, greedy, math, sortings, two pointers

Breaking Good

dfs and similar, dp, graphs, shortest paths

Promising String (hard version)

data structures, implementation, math, strings

Hossam and (sub-)palindromic tree

brute force, data structures, dfs and similar, dp, strings, trees

Timofey and rectangles

constructive algorithms, geometry

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Editor

data structures, implementation

MST Unification

binary search, dsu, graphs, greedy

Shovels Shop

dp, greedy, sortings

Flexible String Revisit

combinatorics, dp, math, probabilities

Clique Partition

brute force, constructive algorithms, graphs, greedy, implementation

Paint the Tree

dp, sortings, trees

Count Binary Strings

data structures, dp

Guess Game

bitmasks, data structures, games, math, probabilities, sortings, strings, trees

Sad powers

binary search, math, number theory

String

brute force, constructive algorithms, hashing, implementation, string suffix structures, strings

Sheikh (Hard Version)

binary search, bitmasks, brute force, greedy, implementation, two pointers

Colorings and Dominoes

combinatorics, dp, greedy, math

Grime Zoo

brute force, greedy, implementation, strings

Tree Constructing

constructive algorithms, graphs

Perfect Groups

dp, math, number theory

Range Deleting

binary search, combinatorics, data structures, two pointers

Two strings

binary search, hashing, strings, two pointers

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

Rain

binary search, brute force, data structures, geometry, greedy, implementation, math

Learning to Paint

binary search, data structures, dfs and similar, dp, greedy, implementation, sortings

Sum over all Substrings (Hard Version)

bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings

Wi-Fi

data structures, dp, greedy

Counting Shortcuts

data structures, dfs and similar, dp, graphs, shortest paths

Counting Binary Strings

combinatorics, dp, math

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

Red-Black Number

dfs and similar, dp, implementation, math, meet-in-the-middle

Carry Bit

combinatorics, math

Lunar New Year and Red Envelopes

data structures, dp

Neko and Aki's Prank

dp, greedy, trees

Underground Lab

constructive algorithms, dfs and similar, graphs

Weird journey

combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Subway Pursuit

binary search, interactive, probabilities

Analysis of Pathes in Functional Graph

data structures, graphs

Candy Party (Hard Version)

bitmasks, constructive algorithms, dp, greedy, implementation, math

Sand Fortress

binary search, constructive algorithms, math

Hot Start Up (hard version)

data structures, dp

Space Harbour

data structures, implementation, math, sortings

Leha and another game about graph

constructive algorithms, data structures, dfs and similar, dp, graphs

Staircases

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

Rearrange Brackets

brute force, dp, greedy, sortings, strings

Cartons of milk

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

Rain and Umbrellas

dp

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Mashmokh and Reverse Operation

combinatorics, divide and conquer

Ball Sorting

data structures, dp, sortings

Well played!

greedy, sortings

Turtle Mission: Robot and the Earthquake

dfs and similar, dp, graphs, shortest paths

Treasure Hunting

binary search, dp, greedy, implementation

Petya, Petya, Petr, and Palindromes

binary search, brute force, data structures, two pointers

Ralph and Mushrooms

dp, graphs

Fedor and coupons

binary search, data structures, greedy, sortings

Autosynthesis

constructive algorithms, dfs and similar, graphs, greedy, sortings

Polygons

geometry, sortings

Array and Segments (Hard version)

data structures, implementation

The Queue

brute force, greedy

Yaroslav and Time

binary search, graphs, shortest paths

Random Task

binary search, bitmasks, combinatorics, dp, math

Towers

dp, greedy, two pointers

The Holmes Children

math, number theory

Spaceship Solitaire

data structures, greedy, implementation

Information Graph

dfs and similar, dsu, graphs, trees

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Apple Tree

dfs and similar, number theory, trees

The way home

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

Maximal Area Quadrilateral

brute force, geometry