Segment Sum

bitmasks, combinatorics, dp, math

Cunning Gena

bitmasks, dp, greedy, sortings

Handshakes

binary search, constructive algorithms, data structures, greedy

Load Testing

greedy

Memory Manager

implementation

A BIT of an Inequality

bitmasks, brute force, combinatorics, dp, math

Queue

constructive algorithms, greedy, sortings

Arpa’s overnight party and Mehrdad’s silent entering

constructive algorithms, dfs and similar, graphs

Vasily the Bear and Sequence

brute force, greedy, implementation, number theory

Ring Road 2

2-sat, dfs and similar, dsu, graphs

Yet Another Substring Reverse

bitmasks, dp

Figure Fixing

constructive algorithms, dfs and similar, dsu, graphs, greedy, math

Super M

dfs and similar, dp, graphs, trees

Xor-sequences

matrices

Voting (Hard Version)

binary search, data structures, greedy

You Are Given a WASD-string...

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

Two strings

binary search, hashing, strings, two pointers

Pinball

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

Qpwoeirut and Vertices

binary search, data structures, dfs and similar, divide and conquer, dsu, greedy, trees

Edges in MST

dfs and similar, dsu, graphs, sortings

Rain

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

Kill Anton

brute force, constructive algorithms, data structures, math, strings

Monitor

binary search, data structures

Mars rover

dfs and similar, graphs, implementation, trees

Omkar and Forest

combinatorics, graphs, math, shortest paths

Permutation Separation

data structures, divide and conquer

Robot Bicorn Attack

brute force, implementation

Sum over all Substrings (Hard Version)

bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings

Literature Lesson

implementation

Counting Shortcuts

data structures, dfs and similar, dp, graphs, shortest paths

Driving Test

data structures, dp, greedy

Wi-Fi

data structures, dp, greedy

Sum of Nestings

constructive algorithms

Red-Black Number

dfs and similar, dp, implementation, math, meet-in-the-middle

Unstable String Sort

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

And Reachability

bitmasks, dp

Misha and Permutations Summation

data structures

Counting Binary Strings

combinatorics, dp, math

Learning to Paint

binary search, data structures, dfs and similar, dp, greedy, implementation, sortings

Carry Bit

combinatorics, math

Lunar New Year and Red Envelopes

data structures, dp

Pick Heroes

greedy, implementation, interactive, sortings

The Road to Berland is Paved With Good Intentions

2-sat, dfs and similar, dsu, graphs

Mike and Frog

brute force, greedy, implementation, math

Kuroni and the Punishment

math, number theory, probabilities

Array

combinatorics, math

Anonymity Is Important

binary search, brute force, data structures, dsu, greedy, sortings

Felicity is Coming!

data structures, hashing, sortings, strings

Delivery Bears

binary search, flows, graphs

Berzerk

dfs and similar, dp, games

Connected Components

data structures, dfs and similar, dp, dsu

Divisors

interactive, math, number theory

Jeopardy!

greedy, math

TCMCF+++

greedy

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Work Group

dfs and similar, dp, graphs, strings, trees

Iahub and Permutations

combinatorics, math

K-th Path

brute force, constructive algorithms, shortest paths, sortings

Pudding Monsters

data structures, divide and conquer

Rectangle and Square

brute force, geometry, math

TV Shows

data structures, greedy, implementation, sortings

Asterism (Hard Version)

binary search, combinatorics, dp, math, number theory, sortings

Ant on the Tree

constructive algorithms, dfs and similar, trees

Power Board

brute force, dp, math, number theory

Underground Lab

constructive algorithms, dfs and similar, graphs

The World Is Just a Programming Task (Easy Version)

brute force, dp, greedy, implementation

Andrew and Taxi

binary search, dfs and similar, graphs

Magic Triples (Hard Version)

brute force, data structures, math, number theory

Triangle Construction

greedy, math

Cipher

combinatorics, dp

Weird journey

combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Candy Box (hard version)

greedy, implementation, sortings

Subway Pursuit

binary search, interactive, probabilities

Jeff and Furik

combinatorics, dp, probabilities

Logo Turtle

dp

Army Creation

binary search, data structures

Heidi and the Turing Test (Easy)

implementation

Analysis of Pathes in Functional Graph

data structures, graphs

Unusual Minesweeper

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

Minimal Coverage

dp

Find a Number

dp, graphs, number theory, shortest paths

Candy Party (Hard Version)

bitmasks, constructive algorithms, dp, greedy, implementation, math

Two Different

constructive algorithms, divide and conquer

Sand Fortress

binary search, constructive algorithms, math

Bitwise Formula

bitmasks, brute force, dfs and similar, expression parsing, implementation

Running Track

dp, greedy, strings, trees

Hot Start Up (hard version)

data structures, dp

Maxim and Array

constructive algorithms, data structures, greedy, math

Dense Subsequence

data structures, greedy, strings

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

Removing Leaves

data structures, greedy, implementation, trees

Neko and Aki's Prank

dp, greedy, trees

Shark

brute force, data structures, dsu, trees

New Year and Arbitrary Arrangement

dp, math, probabilities

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Leha and another game about graph

constructive algorithms, data structures, dfs and similar, dp, graphs

Statistics of Recompressing Videos

*special problem, data structures, implementation

Hack it!

binary search, constructive algorithms, math

Space Harbour

data structures, implementation, math, sortings

Wilbur and Points

combinatorics, greedy, sortings