Sum Queries?

data structures, greedy, implementation, math

Coloring Edges

constructive algorithms, dfs and similar, graphs

The Number Of Good Substrings

binary search, bitmasks, brute force

Zmei Gorynich

greedy, math

Creating a Character

binary search, math

Wi-Fi

data structures, dp, greedy

Numerical Sequence (hard version)

binary search, math

Numerical Sequence (easy version)

binary search, brute force, math

Swords

math

White Sheet

geometry, math

Shooting

greedy, implementation, sortings

Prefixes

strings

Radio Stations

2-sat

Marbles

bitmasks, dp

Ticket Game

games, greedy, math

Swap Letters

constructive algorithms, greedy

The Number of Products

combinatorics, dp, implementation

Yellow Cards

greedy, implementation, math

Tiles Placement

constructive algorithms, dfs and similar, trees

Feeling Good

bitmasks, data structures

Employment

greedy, sortings

Petya and Construction Set

constructive algorithms, graphs, math, sortings, trees

Treasure Island

dfs and similar, dp, flows, hashing

Bad Sequence

data structures, greedy

Badges

brute force, math

Optimal Currency Exchange

brute force, math

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Unstable String Sort

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

Two Small Strings

brute force, constructive algorithms

Equalizing by Division (hard version)

brute force, math, sortings

Equalizing by Division (easy version)

brute force, implementation

Book Reading

math

Bad Prices

data structures, implementation

Chips Moving

math

Unusual Graph

*special problem, graphs

Road Repair in Treeland

*special problem, binary search, dp, trees

King's Path

*special problem, math, trees

kotlinkotlinkotlinkotlin...

*special problem, graphs, implementation, strings

Double Permutation Inc.

*special problem, binary search, greedy

Teams

*special problem, binary search, greedy, math

Ice Cream

*special problem, greedy, sortings

Traveling Around the Golden Ring of Berland

*special problem, implementation

Three Problems

*special problem, implementation

Mateusz and Escape Room

dp

Marek and Matching (hard version)

brute force, probabilities

Marek and Matching (easy version)

brute force, probabilities

Wojtek and Card Tricks

math

Konrad and Company Evaluation

graphs

Kamil and Making a Stream

math, number theory, trees

Marcin and Training Camp

brute force, greedy

Anadi and Domino

brute force, graphs

Moving Walkways

data structures, greedy, math

Into Blocks (hard version)

data structures

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Koala and Notebook

data structures, dfs and similar, graphs, shortest paths, strings, trees

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Cow and Snacks

dfs and similar, dsu, graphs

Paint the Digits

constructive algorithms, greedy, implementation

Koala and Lights

implementation, math, number theory

Paint the Numbers

greedy, implementation, math

Red Blue Tree

data structures, implementation, trees

Polygons

greedy, math, number theory

Bits And Pieces

bitmasks, dfs and similar, dp, greedy

Let Them Slide

data structures, implementation

Restore Permutation

binary search, data structures, greedy, implementation

Magic Grid

constructive algorithms

Uniqueness

binary search, brute force, implementation, two pointers

XORinacci

math

Indie Album

data structures, dfs and similar, hashing, string suffix structures, strings, trees

Remainder Problem

brute force, data structures, implementation

XOR Guessing

bitmasks, interactive, math

Number Of Permutations

combinatorics

Gas Pipeline

dp, greedy

Square Filling

constructive algorithms, greedy, implementation

There Are Two Types Of Burgers

brute force, greedy, implementation, math

Make Product Equal One

dp, implementation

Choose Two Numbers

math, sortings

Beauty of a Permutation

constructive algorithms, math

Expected Value Again

combinatorics, strings

Almost All

constructive algorithms, trees

Palindromic Paths

implementation, interactive

Shortest Cycle

bitmasks, brute force, graphs, shortest paths

Almost Equal

constructive algorithms, greedy, math

Natasha, Sasha and the Prefix Sums

combinatorics, dp, math, number theory

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Kirk and a Binary String (easy version)

brute force, greedy, strings

Anna, Svyatoslav and Maps

dp, graphs, greedy, shortest paths

Mislove Has Lost an Array

greedy, math

BowWow and the Timetable

math

Complete the Projects (hard version)

dp, greedy

Complete the Projects (easy version)

greedy

Boxers

greedy, sortings

Remove the Substring (hard version)

binary search, greedy, implementation, two pointers

Remove the Substring (easy version)

greedy, implementation

Common Divisors

implementation, math

Equal Rectangles

greedy, math

Circle of Students

implementation

You Are Given Some Letters...

binary search, implementation, math

You Are Given Some Strings...

brute force, string suffix structures, strings