Alice and the Doll

binary search, brute force, data structures, greedy, implementation

Balanced Playlist

binary search, data structures, implementation

Balanced Removals (Harder)

constructive algorithms, divide and conquer, greedy, implementation, sortings

Chips

constructive algorithms, implementation

Paint the Tree

brute force, constructive algorithms, dp, graphs, implementation, trees

Rooms and Staircases

brute force, implementation

Pipes

dp, implementation

Social Network (hard version)

data structures, implementation

Social Network (easy version)

implementation

One Node is Gone

constructive algorithms, implementation, trees

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Filling the Grid

implementation, math

Distinct Digits

brute force, implementation

Ania and Minimizing

greedy, implementation

Dawid and Bags of Candies

brute force, implementation

Shooting

greedy, implementation, sortings

Cards

implementation, sortings, strings

The Number of Products

combinatorics, dp, implementation

Yellow Cards

greedy, implementation, math

Harvester

implementation

Periodic integer number

implementation, strings

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Paint the Digits

constructive algorithms, greedy, implementation

Koala and Lights

implementation, math, number theory

Paint the Numbers

greedy, implementation, math

kotlinkotlinkotlinkotlin...

*special problem, graphs, implementation, strings

Traveling Around the Golden Ring of Berland

*special problem, implementation

Three Problems

*special problem, implementation

Sum Queries?

data structures, greedy, implementation, math

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

Equalizing by Division (easy version)

brute force, implementation

Bad Prices

data structures, implementation

Red Blue Tree

data structures, implementation, trees

Let Them Slide

data structures, implementation

Restore Permutation

binary search, data structures, greedy, implementation

Uniqueness

binary search, brute force, implementation, two pointers

Remainder Problem

brute force, data structures, implementation

Square Filling

constructive algorithms, greedy, implementation

There Are Two Types Of Burgers

brute force, greedy, implementation, math

Make Product Equal One

dp, implementation

Palindromic Paths

implementation, interactive

Remove the Substring (hard version)

binary search, greedy, implementation, two pointers

Remove the Substring (easy version)

greedy, implementation

Common Divisors

implementation, math

Circle of Students

implementation

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Compress Words

brute force, hashing, implementation, string suffix structures, strings

White Lines

brute force, data structures, dp, implementation, two pointers

Hotelier

brute force, data structures, implementation

You Are Given Some Letters...

binary search, implementation, math

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

Treasure Hunting

binary search, dp, greedy, implementation

Important Exam

implementation, strings

City Day

implementation

Connected Component on a Chessboard

constructive algorithms, implementation

RGB Substring (hard version)

data structures, dp, implementation, two pointers

RGB Substring (easy version)

implementation

Robot Breakout

implementation

Pillars

greedy, implementation

From S To T

implementation, strings

Yet Another Crosses Problem

implementation

Tokitsukaze and Discard Items

implementation, two pointers

Tokitsukaze and Mahjong

brute force, implementation

Parallel Universes (Easy)

implementation

Heidi and the Turing Test (Easy)

implementation

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Candies!

data structures, dp, implementation, math

Vasya And Array

constructive algorithms, greedy, implementation

Letters Shop

binary search, implementation, strings

Vus the Cossack and a Graph

dfs and similar, graphs, greedy, implementation

Vus the Cossack and a Field

divide and conquer, implementation, math

Vus the Cossack and Strings

implementation, math

Vus the Cossack and a Contest

implementation

Candy Box (hard version)

greedy, implementation, sortings

Subsequences (easy version)

dp, graphs, implementation, shortest paths

Nearest Interesting Number

implementation

Nick and Array

greedy, implementation

Alex and a Rhombus

dp, implementation, math

Serge and Dining Room

binary search, data structures, graph matchings, greedy, implementation, math, trees

Valeriy and Deque

data structures, implementation

Polycarp and Snakes

brute force, implementation

Extra Element

implementation, math

Email from Polycarp

implementation, strings

Irrigation

binary search, data structures, implementation, sortings, trees, two pointers

Flag

brute force, combinatorics, dp, implementation

Split a Number

greedy, implementation, strings

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

Plus from Picture

dfs and similar, implementation, strings

Destroy it!

dp, implementation, sortings

Lose it!

dp, greedy, implementation

Divide it!

brute force, greedy, implementation

Nauuo and Cards

greedy, implementation

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Catch Overflow!

data structures, expression parsing, implementation

From Hero to Zero

implementation, math

Ehab and the Big Finale

constructive algorithms, divide and conquer, graphs, implementation, interactive, trees

Digits Sequence (Hard Edition)

binary search, divide and conquer, implementation

Digits Sequence (Easy Edition)

implementation

Decoding of Integer Sequences

*special problem, data structures, implementation

Minus and Minus Give Plus

*special problem, implementation, strings