Plasticine zebra

constructive algorithms, implementation

Weakened Common Divisor

brute force, greedy, number theory

Doggo Recoloring

implementation, sortings

Pisces

data structures, flows, trees

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Down or Right

constructive algorithms, interactive, matrices

Array Restoration

constructive algorithms, data structures

Bracket Subsequence

greedy

Pair of Toys

math

Single Wildcard Pattern Matching

brute force, implementation, strings

Badge

brute force, dfs and similar, graphs

New Building for SIS

math

Raining season

data structures, divide and conquer, trees

Large Triangle

binary search, geometry, sortings

Sergey's problem

constructive algorithms, graphs

The hat

binary search, interactive

Elections

brute force, greedy

The Films

brute force

The Tree

data structures

The Neutral Zone

brute force, math

The Supersonic Rocket

geometry, hashing, strings

The Wu

bitmasks, brute force, data structures

The Phone Number

constructive algorithms, greedy

The Bits

implementation, math

The Rank

implementation

Appropriate Team

bitmasks, math, number theory

Road Projects

dfs and similar, dp, trees

Rest In The Shades

binary search, geometry

Vasya And The Matrix

constructive algorithms, flows, math

Vasya And The Mushrooms

dp, implementation

Segment Occurrences

brute force, implementation

Death Note

greedy, implementation, math

Bracket Substring

dp, strings

Stars Drawing (Hard Edition)

binary search, dp, greedy

Stars Drawing (Easy Edition)

brute force, dp, greedy

Walking Between Houses

constructive algorithms, greedy

Songs Compression

sortings

Obtaining the String

implementation

Points in Segments

implementation

And

greedy

Piles With Stones

math

Passports

dp, implementation

Cycle sort

dsu, math

AB-Strings

constructive algorithms, strings

Hills

dp

Chemical table

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

Photo of The Sky

brute force, implementation, math, sortings

Planning The Expedition

binary search, brute force, implementation

Stages

greedy, implementation, sortings

Tree

fft, graphs, trees

Store

data structures

Mars rover

dfs and similar, graphs, implementation, trees

Border

number theory

Rocket

binary search, interactive

Fly

binary search, math

Allowed Letters

bitmasks, flows, graph matchings, graphs, greedy

Dominant Indices

data structures, dsu, trees

Intercity Travelling

combinatorics, math, probabilities

Relatively Prime Graph

brute force, constructive algorithms, graphs, greedy, math

Annoying Present

greedy, math

Minimum Ternary String

greedy, implementation

Game Shopping

implementation

Turn the Rectangles

greedy, sortings

Romaji

implementation, strings

Mini Metro

dp

Ants

2-sat, data structures, trees

Guess two numbers

binary search, interactive

Pave the Parallelepiped

bitmasks, brute force, combinatorics, math, number theory

Reorder the Array

combinatorics, data structures, math, sortings, two pointers

Xor-Paths

bitmasks, brute force, dp, meet-in-the-middle

Military Problem

dfs and similar, graphs, trees

Two Strings Swaps

implementation

Three Parts of the Array

binary search, data structures, two pointers

Polycarp's Practice

greedy, implementation, sortings

Adjacent Replacements

implementation

Berland and the Shortest Paths

brute force, dfs and similar, graphs, shortest paths

Median on Segments (General Case Edition)

sortings

Median on Segments (Permutations Edition)

sortings

Polycarp and Div 3

dp, greedy, number theory

Summarize to the Power of Two

brute force, greedy, implementation

Delete from the Left

brute force, implementation, strings

Tanya and Stairways

implementation

Sonya and Bitwise OR

bitmasks, data structures, divide and conquer

Sonya and Ice Cream

binary search, data structures, dp, greedy, shortest paths, trees

Sonya and Matrix

brute force, constructive algorithms, implementation

Sonya and Robots

constructive algorithms, implementation

Sonya and Exhibition

constructive algorithms, greedy, implementation, math

Sonya and Hotels

implementation

Abbreviation

dp, hashing, strings

Tree Constructing

constructive algorithms, graphs

Coins and Queries

greedy

Intense Heat

brute force, implementation, math

Binary String Constructing

constructive algorithms

Polycarp's Pockets

implementation

Another array reconstruction algorithm

Bernstein-Vazirani algorithm

Oracle for majority function

Oracle for f(x) = b * x + (1 - b) * (1 - x) mod 2

Oracle for f(x) = b * x mod 2

Distinguish zero state and plus state without errors