Roads in the Kingdom

dfs and similar, dp, graphs, trees

The penguin's game

binary search, constructive algorithms, interactive

Palindromic characteristics

brute force, dp, hashing, strings

Star sky

dp, implementation

The number on the board

greedy

Key races

math

The Festive Evening

data structures, implementation

The Useless Toy

implementation

Caramel Clouds

data structures, dp, sortings

Red-Black Cobweb

data structures, divide and conquer, implementation, trees

Ever-Hungry Krakozyabra

brute force, combinatorics, greedy, math

The Bakery

binary search, data structures, divide and conquer, dp, two pointers

The Meaningless Game

math, number theory

Vasya and Shifts

matrices

Misha, Grisha and Underground

dfs and similar, graphs, trees

Strange Radiation

binary search, implementation, math

Petya and Exam

implementation, strings

Sasha and Sticks

games, math

Jury Marks

brute force, constructive algorithms

Keyboard Layouts

implementation, strings

Unimodal Array

implementation

Perpetual Motion Machine

constructive algorithms, dp, graphs, implementation, math, trees

Singer House

combinatorics, dp, graphs, trees

Bamboo Partition

brute force, data structures, implementation, math, number theory, sortings, two pointers

Cards Sorting

data structures, implementation, sortings

Office Keys

binary search, brute force, dp, greedy, sortings

Black Square

implementation

Restaurant Tables

implementation

Dirty Arkady's Kitchen

data structures, dp, graphs, shortest paths

Rusty String

fft, math, strings

Best Edge Weight

data structures, dfs and similar, graphs, trees

DNA Evolution

data structures, strings

High Load

constructive algorithms, greedy, implementation, trees

String Reconstruction

data structures, greedy, sortings, strings

Tree Queries

dfs and similar, graphs, trees

String Compression

dp, hashing, string suffix structures, strings

Minimal Labels

data structures, dfs and similar, graphs, greedy

Suitable Replacement

binary search, greedy, implementation

Multi-judge Solving

greedy, implementation

Five-In-a-Row

brute force, implementation

Binary Protocol

implementation

Madness

constructive algorithms, dfs and similar, trees

Liar

binary search, dp, hashing, string suffix structures

My pretty girl Noora

brute force, dp, greedy, math, number theory

Hacker, pack your bags!

binary search, greedy, implementation, sortings

Crossword solving

brute force, implementation, strings

I'm bored with life

implementation, math, number theory

Okabe and El Psy Kongroo

dp, matrices

Okabe and City

dfs and similar, graphs, shortest paths

Okabe and Boxes

data structures, greedy, trees

Okabe and Banana Trees

brute force, math

Okabe and Future Gadget Laboratory

implementation

Mister B and Angle in Polygon

constructive algorithms, geometry, math

Mister B and Book Reading

implementation

Mister B and Flight to the Moon

constructive algorithms, graphs

Mister B and Astronomers

number theory

Mister B and Beacons on Field

number theory

Mister B and PR Shifts

data structures, implementation, math

Mister B and Boring Game

games, greedy

Four Melodies

flows, graphs

Level Generation

binary search, math, ternary search

Card Game Again

binary search, data structures, number theory, two pointers

Multicolored Cars

data structures, implementation

Sofa Thief

brute force, implementation

Permutation Game

implementation

Diplomas and Certificates

implementation, math

MEX Queries

binary search, data structures, trees

Choosing The Commander

bitmasks, data structures, trees

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Really Big Numbers

binary search, brute force, dp, math

Makes And The Product

combinatorics, implementation, math, sortings

Treasure Hunt

implementation, math, number theory

Karen and Coffee

binary search, data structures, implementation

Karen and Morning

brute force, implementation

Karen and Neighborhood

binary search, constructive algorithms, implementation

Karen and Cards

binary search, combinatorics, data structures, geometry

Karen and Supermarket

brute force, dp, trees

Karen and Test

brute force, combinatorics, constructive algorithms, math

Karen and Game

brute force, greedy, implementation

An unavoidable detour for home

combinatorics, dp, graphs, shortest paths

An overnight dance in discotheque

dfs and similar, dp, geometry, greedy, trees

An impassioned circulation of affection

brute force, dp, strings, two pointers

An express train to reveries

constructive algorithms

An abandoned sentiment from past

constructive algorithms, greedy, implementation, sortings

Bipartite Checking

data structures, dsu, graphs

Army Creation

binary search, data structures

Two Melodies

dp, flows

The Tag Game

dfs and similar, graphs

The Golden Age

brute force, math

The Contest

implementation

Sagheer and Apple Tree

games, trees

Sagheer and Kindergarten

dfs and similar, graphs, implementation, trees

Sagheer and Nubian Market

binary search, sortings

Sagheer, the Hausmeister

bitmasks, brute force, dp

Sagheer and Crossroads

implementation

Vladik and Entertaining Flags

data structures, dsu, graphs

Vladik and Favorite Game

constructive algorithms, dfs and similar, graphs, interactive

Vladik and Memorable Trip

dp, implementation

Vladik and Complicated Book

implementation, sortings

Vladik and Courtesy

brute force, implementation