Off by One

constructive algorithms, dfs and similar, geometry, graphs, sortings, trees

Hobbits

binary search, geometry

Tavas and Pashmaks

geometry, math

Bear and Floodlight

bitmasks, dp, geometry

Robo-Footballer

binary search, geometry

The Check of the Point

*special problem, geometry

Set of Points

constructive algorithms, geometry

Special Olympics

geometry

Harry Potter and the Golden Snitch

binary search, geometry

Paint Tree

constructive algorithms, divide and conquer, geometry, sortings, trees

Sum of Prefix Sums

data structures, divide and conquer, geometry, trees

Happy Farm 5

geometry

Arrow

geometry

Geometers Anonymous Club

data structures, geometry, math, sortings

The Child and Polygon

dp, geometry

Billiard

geometry, number theory

Zoo

brute force, geometry

Very simple problem

geometry, two pointers

Winding polygonal line

constructive algorithms, geometry, greedy, math

Alyona and Triangles

geometry, two pointers

Spinach Pizza

games, geometry, greedy, interactive

Disjoint Triangles

geometry

Large Triangle

binary search, geometry, sortings

Karen and Cards

binary search, combinatorics, data structures, geometry

Triangles

dp, geometry

Jog Around The Graph

binary search, dp, geometry, graphs

Chemistry Lab

dp, geometry, probabilities

Robot Arm

data structures, geometry

Igloo Skyscraper

data structures, geometry

Not Splitting

geometry, graphs, greedy, implementation, shortest paths

A Colourful Prospect

geometry, graphs

Mogohu-Rea Idol

geometry

Rectangular Polyline

constructive algorithms, dp, geometry

Swap Pass

constructive algorithms, geometry, sortings

A New Beginning

data structures, dp, geometry, sortings

Sereja and Straight Lines

binary search, data structures, geometry, sortings, two pointers

Two Friends

binary search, geometry

Mirror Box

geometry, implementation

A Shade of Moonlight

binary search, geometry, math, sortings, two pointers

Limak and Shooting Points

brute force, geometry, math

Crop Squares

constructive algorithms, geometry, interactive, math

On a plane

*special problem, geometry

Max and Bike

binary search, geometry

Monocarp and a Strategic Game

geometry, sortings, two pointers

Plane Tiling

geometry, implementation, math

Satanic Panic

dp, geometry

Runaway to a Shadow

geometry, sortings

Building an Amusement Park

binary search, geometry

Cookie Clicker

dp, geometry

Yet Another Partiton Problem

data structures, divide and conquer, dp, geometry, two pointers

New Year and Cake

geometry, two pointers

Randomizer

combinatorics, geometry, probabilities

Sherlock's bet to Moriarty

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation, trees

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

King's Problem?

geometry, greedy

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Uncle Bogdan and Projections

data structures, geometry, sortings

Shifting Dominoes

data structures, geometry, graphs, trees

Donkey and Stars

data structures, dp, geometry, math, sortings

Delivering Carcinogen

binary search, geometry

Martian Food

geometry

New Year Snowflake

geometry, sortings

Cut Length

geometry

Shortest path

brute force, geometry, math, shortest paths

Dark Matter

bitmasks, geometry

Cannon

data structures, geometry, sortings

RC Kaboom Show

binary search, brute force, data structures, geometry, math

The Last Hole!

brute force, geometry

Rotation

*special problem, geometry, math

Fading into Fog

geometry, interactive, math, probabilities

Ruminations on Ruminants

geometry, math

New Year Tree Decorations

geometry, schedules, sortings

Roland and Rose

brute force, geometry, math, sortings

Stars

constructive algorithms, geometry

Max and Min

geometry

Tetragon

geometry, math

Bowls

geometry, implementation

Hide-and-Seek

geometry, implementation

Save the City!

geometry

Pandemic Restrictions

geometry, ternary search

Say Hello

geometry

Archer's Shot

binary search, geometry, math, two pointers

Hag's Khashba

geometry

Help Greg the Dwarf

geometry, ternary search

Sign Posts

brute force, geometry, math

Polygon

binary search, dp, geometry

Battlefield

geometry, graphs, implementation, shortest paths

Line Distance

binary search, data structures, geometry

Little Elephant and Triangle

geometry, math

Iron Man

data structures, geometry, trees

Chain Reaction

brute force, geometry

Ship's Shortest Path

geometry, shortest paths

Evaluate RBS

data structures, geometry, implementation, math, sortings

Fishingprince Plays With Array Again

brute force, data structures, geometry, math

Symmetric Projections

geometry

Polygon

constructive algorithms, geometry

Power Defence

brute force, dp, geometry, greedy

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Cross Sum

binary search, geometry

Inquisition

geometry, implementation, sortings