Fragile Bridges

dp

Weak Memory

dfs and similar, dsu

Intersection

implementation, math

Interesting Game

dp, games, math

Neural Network country

dp, matrices

Number Busters

binary search, math

Digital Root

number theory

Police Patrol

greedy, implementation, math, ternary search

MYSTERIOUS LANGUAGE

*special problem

Rectangle Puzzle

geometry

Sereja and Periods

binary search, dfs and similar, strings

New Year Letter

bitmasks, brute force, dp

Second price auction

bitmasks, probabilities

Olya and magical square

constructive algorithms, implementation, math

Circular Mirror

binary search, combinatorics, geometry, math, two pointers

Ants

brute force, implementation

Wires

dfs and similar, graphs, greedy

Restoring Increasing Sequence

binary search, brute force, greedy, implementation

Bubble Strike

combinatorics, math, probabilities, ternary search

Vanya and Field

math

Build String

flows, graphs

International Olympiad

constructive algorithms, greedy, implementation, math

Minimal Diameter Forest

constructive algorithms, dfs and similar, greedy, trees

Mahmoud and Ehab and the binary string

binary search, divide and conquer, interactive

Restore Cube

brute force, geometry

Jamie and Binary Sequence (changed after round)

bitmasks, greedy, math

Sereja and the Arrangement of Numbers

graphs, greedy, sortings

Gifts by the List

constructive algorithms, dfs and similar, graphs, trees

Restoration of string

constructive algorithms, graphs, implementation

Big Maximum Sum

data structures, dp, greedy, implementation, math, trees

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

Little Elephant and LCM

binary search, combinatorics, dp, math

Sereja and Subsequences

data structures, dp

Pretty Song

math, strings

Microtransactions (easy version)

binary search, greedy

Beaver Game

dp, games, number theory

Mike and Geometry Problem

combinatorics, data structures, dp, geometry, implementation

Geo Game

greedy, interactive, math

Giving Awards

dfs and similar

Theseus and labyrinth

graphs, implementation, shortest paths

Water Taps

binary search, greedy, sortings

The Fair Nut and Strings

greedy, strings

Ghosts

geometry, math

A Determined Cleanup

math

Twisted Circuit

*special problem, brute force, implementation

The hat

binary search, interactive

Castle Defense

binary search, data structures, greedy, two pointers

Dasha and Puzzle

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

Elongated Matrix

binary search, bitmasks, brute force, dp, graphs

Two out of Three

dp

Olympiad in Programming and Sports

dp, flows, graphs, greedy

Dima and Containers

constructive algorithms, greedy, implementation

Helga Hufflepuff's Cup

dp, trees

Cloud Computing

data structures, greedy

Sums of Digits

dp, greedy, implementation

Let's Play the Hat?

brute force, constructive algorithms, greedy, math

Stripe 2

binary search, dp, sortings

Microtransactions (hard version)

binary search, greedy, implementation

PLEASE

combinatorics, dp, implementation, math, matrices

Ithea Plays With Chtholly

binary search, constructive algorithms, games, greedy, interactive

Greedy Arkady

math

World Tour

graphs, shortest paths

Yaroslav and Two Strings

combinatorics, dp

Roma and Poker

dp, graphs

An overnight dance in discotheque

dfs and similar, dp, geometry, greedy, trees

Infinite Maze

dfs and similar, graphs

Vitaly and Cycle

combinatorics, dfs and similar, graphs, math

Area of Two Circles' Intersection

geometry

Interactive LowerBound

brute force, interactive, probabilities

Wrong Answer

constructive algorithms

Industrial Nim

games

Anya and the Mysterious String

binary search, data structures

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Multi-Colored Segments

binary search, data structures, math, sortings

Copy of a Copy of a Copy

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

Running Track

dp, greedy, strings, trees

Om Nom and Candies

brute force, greedy, math

Unusual Minesweeper

binary search, dfs and similar, dsu, greedy, sortings

The World Is Just a Programming Task (Easy Version)

brute force, dp, greedy, implementation

Candy Box (hard version)

greedy, implementation, sortings

Cipher

combinatorics, dp

TV Shows

data structures, greedy, implementation, sortings

Maxim and Array

constructive algorithms, data structures, greedy, math

Iahub and Permutations

combinatorics, math

Work Group

dfs and similar, dp, graphs, strings, trees

Berzerk

dfs and similar, dp, games

Divisors

interactive, math, number theory

Ant on the Tree

constructive algorithms, dfs and similar, trees

Misha and Permutations Summation

data structures

Mars rover

dfs and similar, graphs, implementation, trees

Messages

brute force, dp, greedy, probabilities, sortings

Remove Directed Edges

dfs and similar, dp, graphs

Polycarp and Snakes

brute force, implementation

Freedom of Choice

brute force, greedy, implementation

One-Dimensional Puzzle

combinatorics, math, number theory

Pinball

binary search, data structures, implementation, math, two pointers

Stack Sorting

constructive algorithms, data structures, greedy, implementation

PolandBall and Polygon

data structures

Multicolored Markers

binary search, brute force, math, number theory

Jeremy Bearimy

dfs and similar, graphs, greedy, trees