Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

Unsorting Array

brute force, sortings

Full Binary Tree Queries

brute force, implementation, trees

Nearest Leaf

data structures, trees

Evolution of Weasels

greedy, implementation, strings

Greedy Shopping

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

Door Frames

greedy, implementation

Colorful Points

data structures, greedy, implementation

Phone Number

dp

List Of Integers

binary search, bitmasks, brute force, combinatorics, math, number theory

Spyke Chatting

implementation

Jamie and Binary Sequence (changed after round)

bitmasks, greedy, math

String Set Queries

brute force, data structures, hashing, interactive, string suffix structures, strings

K Integers

binary search, data structures

Hemose on the Tree

bitmasks, constructive algorithms, dfs and similar, trees

Network Mask

*special problem, bitmasks, brute force, implementation

Numbers

combinatorics, dp

Restore Cube

brute force, geometry

The Beach

constructive algorithms, dfs and similar, graphs, shortest paths

Delete a Segment

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

Subtree Minimum Query

data structures, trees

Light Bulbs (Easy Version)

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

IT Restaurants

dfs and similar, dp, trees

Train Maintenance

brute force, data structures, implementation

Maximum Monogonosity

brute force, dp, math

Earth Wind and Fire

constructive algorithms, greedy, math, sortings, two pointers

Greg and Friends

combinatorics, dp, graphs, shortest paths

Points

implementation, math

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Substitutes in Number

dp

Chopping Carrots (Hard Version)

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

Ordering Pizza

binary search, sortings, ternary search

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

GukiZ and GukiZiana

binary search, data structures, implementation

Red-Black Pepper

brute force, data structures, greedy, math, number theory

Insertion Sort

data structures, dp, implementation, math

Alice and the Doll

brute force, data structures, greedy, implementation

Yet Another Inversions Problem

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

You Are Given a Tree

data structures, dp, trees

Tree

binary search, dp, trees

Hockey

implementation, strings

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Quantifier Question

dfs and similar, dp, graphs, math

DIY Garland

constructive algorithms, greedy, trees

Sum Queries?

data structures, greedy, implementation, math

Maximize Mex

flows, graph matchings, graphs

Disposition

constructive algorithms, math

Tree Modification

brute force, constructive algorithms, dfs and similar, graph matchings, graphs, trees

On the Bench

combinatorics, dp

Death Stars (easy)

implementation

Arthur and Walls

constructive algorithms, data structures, graphs, greedy, shortest paths

Sky Full of Stars

combinatorics, math

Bots

combinatorics, dp, math, number theory

Scrambled

*special problem, implementation

Professor GukiZ and Two Arrays

binary search, two pointers

AmShZ and G.O.A.T.

binary search, brute force, greedy, implementation, math

Distributing Parts

greedy, sortings

Average Score

greedy, math, sortings

Bulls and Cows

brute force, implementation

Bear and Up-Down

brute force, implementation

Mister B and PR Shifts

data structures, implementation, math

Grid

brute force

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

Network Coverage

binary search, constructive algorithms, data structures, greedy

Artem and Array

data structures, greedy

Diana and Liana

greedy, implementation, two pointers

International Olympiad

constructive algorithms, greedy, implementation, math

Minimal Diameter Forest

constructive algorithms, dfs and similar, greedy, trees

Doctor

binary search, math, sortings

Camels

dp

Changing Brackets

constructive algorithms, data structures, dp, greedy

DNA Evolution

data structures, strings

Ice cream coloring

constructive algorithms, dfs and similar, greedy

Memory and Scores

combinatorics, dp, math

Vlad and the Nice Paths (hard version)

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

Salazar Slytherin's Locket

bitmasks, dp

President and Roads

dfs and similar, graphs, hashing, shortest paths

Berland and the Shortest Paths

brute force, dfs and similar, graphs, shortest paths

Sasha and the Wedding Binary Search Tree

brute force, combinatorics, data structures, dfs and similar, math, trees

Non-Intersecting Subpermutations

combinatorics, dp, implementation, math

Lucky Array

data structures

Frequency Problem (Easy Version)

data structures, greedy

(Zero XOR Subset)-less

math, matrices

Ann and Books

data structures, flows, hashing

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Tournament

brute force, dp, greedy

Egor in the Republic of Dagestan

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

Add Points

Fairy

dfs and similar, divide and conquer, dsu

Cactus Wall

constructive algorithms, dfs and similar, graphs, shortest paths

Long Way Home

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

Sorting Pancakes

dp

Special Matrices

combinatorics, dp

Fair Share

constructive algorithms, data structures, dfs and similar, graph matchings, graphs

Mushroom Scientists

math, ternary search

Flawed Flow

constructive algorithms, flows, graphs, greedy

Triangles

combinatorics, graphs, math

Event Dates

greedy, meet-in-the-middle, sortings

Helping Hiasat

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

Biathlon

binary search, implementation