Tree Queries

dfs and similar, graphs, trees

Present

binary search, bitmasks, constructive algorithms, data structures, math, sortings

World of Darkraft: Battle for Azathoth

brute force, data structures, sortings

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Skyscrapers (hard version)

data structures, dp, greedy

Array Shrinking

dp, greedy

Moving Points

data structures, divide and conquer, implementation, sortings

Three Integers

brute force, math

Cow and Fields

binary search, data structures, dfs and similar, graphs, greedy, shortest paths, sortings

Kuroni and the Celebration

constructive algorithms, dfs and similar, interactive, trees

1-Trees and Queries

data structures, dfs and similar, shortest paths, trees

Fill The Bag

bitmasks, greedy

Time to Run

constructive algorithms, graphs, implementation

Water Balance

data structures, geometry, greedy

Berland Beauty

constructive algorithms, dfs and similar, greedy, sortings, trees

String Coloring (hard version)

data structures, dp

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Obtain a Permutation

greedy, implementation, math

Messenger Simulator

data structures

Minimax Problem

binary search, bitmasks, dp

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

New Year and Conference

binary search, data structures, hashing, sortings

Jeremy Bearimy

dfs and similar, graphs, greedy, trees

Segment Tree

data structures, dsu, graphs, trees

Let's Play the Words?

data structures, hashing, implementation, math

Two Fairs

combinatorics, dfs and similar, dsu, graphs

Nearest Opposite Parity

dfs and similar, graphs, shortest paths

Common Number

binary search, combinatorics, dp, math

Portals

data structures, dp, greedy, implementation, sortings

Strange Device

constructive algorithms, interactive, math, sortings

Domino for Young

dp, greedy, math

Key Storage

combinatorics, math

Spaceship Solitaire

data structures, greedy, implementation

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Beautiful Mirrors

data structures, dp, math, probabilities

Beautiful Sequence

brute force, constructive algorithms, greedy

Editor

data structures, implementation

A Game with Traps

binary search, dp, greedy, sortings

The Contest

data structures, dp, greedy

Equalizing Two Strings

constructive algorithms, sortings, strings

Yet Another Division Into Teams

dp, greedy, sortings

Send Boxes to Alice (Hard Version)

constructive algorithms, greedy, math, number theory, ternary search, two pointers

Addition Robot

data structures, math, matrices

Performance Review

data structures

Salary Changing

binary search, greedy, sortings

Wires

dfs and similar, graphs, greedy

Trip to Saint Petersburg

data structures

The World Is Just a Programming Task (Easy Version)

brute force, dp, greedy, implementation

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

Minimizing Difference

binary search, constructive algorithms, greedy, sortings, ternary search, two pointers

The Football Season

brute force, math, number theory

0-1 MST

dfs and similar, dsu, graphs, sortings

AB-string

binary search, combinatorics, dp, strings

Balanced Playlist

binary search, data structures, implementation

Balanced Removals (Harder)

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

Special Permutations

math

Complete Tripartite

brute force, constructive algorithms, graphs, hashing, implementation

Paint the Tree

dp, sortings, trees

Sequence Sorting

dp, greedy, two pointers

Alex and Julian

bitmasks, math, number theory

Harvester

implementation

The Light Square

2-sat, dfs and similar, greedy

Coloring Edges

constructive algorithms, dfs and similar, graphs

Wi-Fi

data structures, dp, greedy

Numerical Sequence (easy version)

binary search, brute force, math

Petya and Construction Set

constructive algorithms, graphs, math, sortings, trees

Treasure Island

dfs and similar, dp, flows, hashing

Unstable String Sort

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

Two Small Strings

brute force, constructive algorithms

Double Permutation Inc.

*special problem, binary search, greedy

Teams

*special problem, binary search, greedy, math

Kamil and Making a Stream

math, number theory, trees

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Restore Permutation

binary search, data structures, greedy, implementation

Remainder Problem

brute force, data structures, implementation

XOR Guessing

bitmasks, interactive, math

Shortest Cycle

bitmasks, brute force, graphs, shortest paths

Kirk and a Binary String (hard version)

data structures, greedy, math, strings

Kirk and a Binary String (easy version)

brute force, greedy, strings

Complete the Projects (easy version)

greedy

Print a 1337-string...

combinatorics, constructive algorithms, math, strings

You Are Given a WASD-string...

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

Treasure Hunting

binary search, dp, greedy, implementation

Compress Words

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

White Lines

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

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Yet Another Subarray Problem

dp, greedy, math

OpenStreetMap

data structures, two pointers

Tokitsukaze and Strange Rectangle

data structures, divide and conquer, sortings, two pointers

Tree Painting

dfs and similar, dp, trees

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Two Pizzas

bitmasks, brute force

Polycarp and Snakes

brute force, implementation

Daleks' Invasion (medium)

dfs and similar, graphs, shortest paths, trees

Daleks' Invasion (easy)

graphs, trees

Heidi Learns Hashing (Medium)

brute force, number theory

Subsequences (hard version)

dp, strings

Candy Box (hard version)

greedy, implementation, sortings

Topforces Strikes Back

brute force, math, sortings