XOR and Favorite Number

data structures

Polyline

constructive algorithms, implementation

Watering Flowers

implementation

Chocolate

combinatorics

Elephant

math

Expensive Strings

string suffix structures, strings

Sum of Remainders

implementation, math, number theory

Longest k-Good Segment

binary search, data structures, two pointers

The Labyrinth

dfs and similar

Dinner with Emma

games, greedy

Comparing Two Long Integers

implementation, strings

Hexagons

binary search, implementation, math

Multipliers

math, number theory

Running Track

dp, greedy, strings, trees

Longtail Hedgehog

dp, graphs

Bulbs

implementation

Gena's Code

implementation, math

Link/Cut Tree

brute force, implementation

Puzzle Lover

dp, hashing, strings

Kingdom and its Cities

dfs and similar, divide and conquer, dp, graphs, sortings, trees

Necklace

constructive algorithms, math

Skills

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

Peter and Snow Blower

binary search, geometry, ternary search

Simba on the Circle

dp

Square Root of Permutation

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

The Union of k-Segments

greedy, sortings

Replace To Make Regular Bracket Sequence

data structures, expression parsing, math

HDD is Outdated Technology

implementation, math

The Text Splitting

brute force, implementation, strings

New Year and Forgotten Tree

constructive algorithms, flows, graphs

New Year and Cake

geometry, two pointers

New Year and Cleaning

binary search, implementation

New Year and Three Musketeers

data structures, greedy, sortings

New Year and Ancient Prophecy

dp, hashing, strings

New Year and Domino

dp, implementation

New Year and Old Property

bitmasks, brute force, implementation

New Year and Days

implementation

Alphabet Permutations

data structures, strings

Vika and Segments

constructive algorithms, data structures, geometry, two pointers

Harmony Analysis

constructive algorithms

Vika and Squares

constructive algorithms, implementation

Pasha and Stick

combinatorics, math

Frogs and mosquitoes

data structures, greedy

Minimum spanning tree for each edge

data structures, dfs and similar, dsu, graphs, trees

Gadgets for dollars and pounds

binary search, greedy, two pointers

Load Balancing

implementation, math

The Best Gift

constructive algorithms, implementation

USB Flash Drives

greedy, implementation, sortings

Hamming Distance Sum

combinatorics, strings

Saitama Destroys Hotel

implementation, math

Cross Sum

binary search, geometry

Power Tree

data structures, trees

Marbles

hashing, strings

Zuma

dp

Chain Reaction

binary search, dp

Testing Robots

implementation

Magic Spheres

implementation

Intergalaxy Trips

probabilities, shortest paths

Board Game

data structures, dfs and similar

Freelancer's Dreams

geometry

Lazy Student

constructive algorithms, data structures, graphs

Sorting Railway Cars

constructive algorithms, greedy

More Cowbell

binary search, greedy

Uncowed Forces

implementation

Pastoral Oddities

data structures, divide and conquer, dsu, math, trees

Ruminations on Ruminants

geometry, math

Lieges of Legendre

games, math

Moodular Arithmetic

combinatorics, dfs and similar, dsu, math, number theory

Alternative Thinking

dp, greedy, math

Approximating a Constant Range

dp, implementation, two pointers

Two Bases

brute force, implementation

A Museum Robbery

data structures, dp

Acyclic Organic Compounds

data structures, dfs and similar, dsu, hashing, strings, trees

Kleofáš and the n-thlon

dp, math, probabilities

Lipshitz Sequence

data structures, math

The Two Routes

graphs, shortest paths

Edge coloring of bipartite graph

graphs

Lomsat gelral

data structures, dfs and similar, dsu, trees

Area of Two Circles' Intersection

geometry

Make Palindrome

constructive algorithms, greedy, strings

Queries about less or equal elements

binary search, data structures, sortings, two pointers

Extract Numbers

implementation, strings

Sandy and Nuts

bitmasks, dp, trees

Spongebob and Squares

brute force, math

Day at the Beach

sortings

Spongebob and Joke

implementation

Patrick and Shopping

implementation

Cut Length

geometry

Chocolate Bar

brute force, dp

Igor In the Museum

dfs and similar, graphs, shortest paths

Nearest vectors

geometry, sortings

Queries on a String

implementation, strings

Tricky Sum

math

Subsequences

data structures, dp

Restaurant

dp, greedy, sortings

Divisibility

math

Wilbur and Strings

dfs and similar, dp, graphs, strings

Wilbur and Trees

dp, math, probabilities, sortings

Wilbur and Points

combinatorics, greedy, sortings

Wilbur and Array

greedy, implementation