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

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

Alphabet Permutations

data structures, strings

Vika and Segments

constructive algorithms, data structures, geometry, two pointers

Harmony Analysis

constructive algorithms

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

Cross Sum

binary search, geometry

Power Tree

data structures, trees

Marbles

hashing, strings

Zuma

dp

Chain Reaction

binary search, dp

Testing Robots

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

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

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

Extract Numbers

implementation, strings

Sandy and Nuts

bitmasks, dp, trees

Spongebob and Squares

brute force, math

Day at the Beach

sortings

Cut Length

geometry

Chocolate Bar

brute force, dp

Igor In the Museum

dfs and similar, graphs, shortest paths

Nearest vectors

geometry, sortings

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

Pasha and Phone

binary search, math

Cutting the Line

string suffix structures, strings

REQ

data structures, number theory

Edo and Magnets

brute force, greedy, implementation, two pointers

Max and Bike

binary search, geometry

Warrior and Archer

games

Strange Calculation and Cats

dp, matrices

Happy Tree Party

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

Beautiful Function

constructive algorithms, math

Anton and Lines

geometry, sortings

BCPC

binary search, geometry, two pointers

Super M

dfs and similar, dp, graphs, trees

The Big Race

math

Birthday

graph matchings, strings

Top Secret Task

dp

Three States

dfs and similar, graphs, shortest paths

Chip 'n Dale Rescue Rangers

binary search, geometry, math

Median Smoothing

implementation

Duff is Mad

data structures, strings

Duff as a Queen

data structures

Duff in Mafia

2-sat, binary search

Duff in the Army

data structures, trees

Duff in Beach

dp

Digits of Number Pi

dp, implementation, strings

Present for Vitalik the Philatelist

combinatorics, math, number theory

Lizard Era: Beginning

meet-in-the-middle

Alice, Bob, Oranges and Apples

number theory

Phillip and Trains

dfs and similar, graphs, shortest paths

Gennady the Dentist

brute force, implementation

Anton and Ira

constructive algorithms, greedy, math

Dima and Lisa

brute force, math, number theory

Marina and Vasya

constructive algorithms, greedy, strings

Boolean Function

bitmasks, dp, expression parsing

Number of Binominal Coefficients

dp, math, number theory

Superior Periodic Subarrays

number theory

Once Again...

constructive algorithms, dp, matrices

GCD Table

constructive algorithms, greedy, number theory

Zublicanes and Mumocrates

dp, trees, two pointers

Kojiro and Furrari

dp, greedy

Three Logos

bitmasks, brute force, constructive algorithms, geometry, implementation, math

Kefa and Watch

data structures, hashing, strings

Kefa and Dishes

bitmasks, dp

Mirror Box

matrices, trees

Walking!

constructive algorithms, greedy

LCS Again

dp, greedy

Weakness and Poorness

ternary search