X-OR

bitmasks, constructive algorithms, divide and conquer, interactive, probabilities

James and the Chase

dfs and similar, graphs, probabilities, trees

Find a Gift

binary search, interactive, probabilities

Slime and Biscuits

math, probabilities

Nastya and Bees

graphs, interactive, probabilities

Battalion Strength

data structures, divide and conquer, probabilities

Kuroni and the Punishment

math, number theory, probabilities

Tourism

dp, graphs, probabilities

Good Contest

combinatorics, dp, probabilities

LCC

data structures, math, matrices, probabilities

Santa's Bot

combinatorics, math, probabilities

Cards

combinatorics, dp, math, number theory, probabilities

Beautiful Mirrors

data structures, dp, math, probabilities

Beautiful Bracket Sequence (hard version)

combinatorics, probabilities

Beautiful Bracket Sequence (easy version)

combinatorics, dp, probabilities

Beautiful Mirrors with queries

data structures, probabilities

Game Relics

math, probabilities

Tree Queries

data structures, probabilities, trees

Hyakugoku and Ladders

dp, probabilities, shortest paths

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Marek and Matching (hard version)

brute force, probabilities

Marek and Matching (easy version)

brute force, probabilities

GCD Groups 2

greedy, number theory, probabilities

Crossword Expert

combinatorics, dp, number theory, probabilities, two pointers

Tokitsukaze and Powers

number theory, probabilities

Expected Square Beauty

dp, math, probabilities

Nauuo and Pictures (hard version)

dp, probabilities

Nauuo and Pictures (easy version)

dp, probabilities

Gold Experience

constructive algorithms, graphs, math, number theory, probabilities

Card Bag

dp, math, probabilities

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Serval and Bonus Problem

combinatorics, dp, math, probabilities

Steps to One

dp, math, number theory, probabilities

Arithmetic Progression

binary search, interactive, number theory, probabilities

Makoto and a Blackboard

dp, math, number theory, probabilities

Inversion Expectation

dp, math, probabilities

The Top Scorer

combinatorics, dp, math, probabilities

Mergesort Strikes Back

math, probabilities

Lost Root

interactive, probabilities

Computer Game

dp, greedy, math, probabilities

Interstellar battle

math, probabilities, trees

Vasya and Magic Matrix

dp, math, probabilities

Subway Pursuit

binary search, interactive, probabilities

Intercity Travelling

combinatorics, math, probabilities

A Trance of Nightfall

dp, geometry, matrices, probabilities

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

I'm Feeling Lucky!

probabilities

Astronomy

geometry, probabilities

Game with String

implementation, probabilities, strings

Fafa and Ancient Alphabet

math, probabilities

Don't Exceed

math, probabilities

Strongly Connected Tournament

dp, graphs, math, probabilities

Fishes

data structures, graphs, greedy, probabilities, shortest paths

New Year and Arbitrary Arrangement

dp, math, probabilities

Willem, Chtholly and Seniorious

data structures, probabilities

Eyes Closed

data structures, probabilities

Something with XOR Queries

brute force, interactive, probabilities

Third Month Insanity

dp, probabilities, trees

Random Query

data structures, math, probabilities, two pointers

Interactive LowerBound

brute force, interactive, probabilities

Destiny

data structures, probabilities

Journey

dfs and similar, dp, graphs, probabilities, trees

Marmots (hard)

math, probabilities

Barrels and boxes

brute force, combinatorics, math, number theory, probabilities

Jon and Orbs

dp, math, probabilities

Inversions After Shuffle

data structures, probabilities

Gosha is hunting

brute force, data structures, dp, flows, math, probabilities, sortings

Pokermon League challenge

math, probabilities

Dexterina’s Lab

games, matrices, probabilities

Memory and Casinos

data structures, math, probabilities

ZS and The Birthday Paradox

math, number theory, probabilities

LRU

bitmasks, dp, math, probabilities

Puzzles

dfs and similar, math, probabilities, trees

Another Sith Tournament

bitmasks, dp, math, probabilities

Bear and Chase

brute force, dfs and similar, graphs, implementation, math, probabilities

Bear and Destroying Subtrees

dp, math, probabilities, trees

Little Artem and Random Variable

dp, implementation, math, probabilities

Gambling Nim

bitmasks, math, matrices, probabilities

Startup Funding

binary search, constructive algorithms, data structures, probabilities, two pointers

Famil Door and Roads

combinatorics, data structures, dfs and similar, dp, probabilities, trees

Jerry's Protest

brute force, combinatorics, dp, probabilities

Birthday

greedy, math, probabilities

Wet Shark and Flowers

combinatorics, math, number theory, probabilities

Combining Slimes

dp, math, matrices, probabilities

Intergalaxy Trips

probabilities, shortest paths

Kleofáš and the n-thlon

dp, math, probabilities

Wilbur and Trees

dp, math, probabilities, sortings

Randomizer

combinatorics, geometry, probabilities

Kyoya and Train

dp, fft, graphs, math, probabilities

Bad Luck Island

dp, probabilities

Ilya and Escalator

combinatorics, dp, math, probabilities

Inversions problem

dp, probabilities

Second price auction

bitmasks, probabilities

Name That Tune

dp, probabilities, two pointers

Helping People

dp, probabilities

Game with Strings

bitmasks, dp, probabilities

Dreamoon and WiFi

bitmasks, brute force, combinatorics, dp, math, probabilities

World of Darkraft - 2

dp, probabilities

Bingo!

combinatorics, math, probabilities

Little Pony and Expected Maximum

probabilities