Colored Tree

data structures, trees

Tournament

brute force, dp, greedy

Divisor Set

divide and conquer, fft, greedy, math, number theory

Make Them Similar

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

The Contest

data structures, dp, greedy

Equalizing Two Strings

constructive algorithms, sortings, strings

Yet Another Division Into Teams

dp, greedy, sortings

Send Tree to Charlie

combinatorics, dfs and similar, dsu, trees

Tree Queries

data structures, probabilities, trees

Point Ordering

constructive algorithms, geometry, interactive, math

Send Boxes to Alice (Hard Version)

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

Cheap Robot

binary search, dsu, graphs, shortest paths, trees

Antenna Coverage

data structures, dp, greedy, sortings

Road Construction

flows, graphs

Addition Robot

data structures, math, matrices

Tiling Terrace

brute force, dp

Mission Possible

Performance Review

data structures

Regular Forestation

hashing, trees

Songwriter

greedy, two pointers

Find String in a Grid

data structures, dp, strings, trees

Cleaning Robots

dp, trees

Red-White Fence

combinatorics, fft

Voting (Hard Version)

binary search, data structures, greedy

Voting (Easy Version)

data structures, dp, greedy

Wires

dfs and similar, graphs, greedy

SmartGarden

constructive algorithms, divide and conquer

Projectors

flows, graphs

Show Must Go On

binary search, brute force, greedy, shortest paths

Discarding Game

dp, greedy, two pointers

The Coronation

graphs, implementation

Conference Problem

dp

Trip to Saint Petersburg

data structures

Maximum Weight Subset

dp, trees

The World Is Just a Programming Task (Easy Version)

brute force, dp, greedy, implementation

Cursor Distance

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

Hyakugoku and Ladders

dp, probabilities, shortest paths

Running in Pairs

constructive algorithms, greedy, math

Chips

constructive algorithms, implementation

Minimizing Difference

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

The Football Season

brute force, math, number theory

Planar Perimeter

constructive algorithms, graphs

Number Discovery

math

Sum Balance

bitmasks, dfs and similar, dp, graphs

Football

graphs

Swiper, no swiping!

graphs, implementation

Turtle

dp, implementation

Catowice City

2-sat, dfs and similar, graph matchings, graphs

Queue in the Train

data structures, greedy, implementation

The World Is Just a Programming Task (Hard Version)

implementation

Adilbek and the Watering System

data structures, greedy, sortings

The Maximum Subtree

dfs and similar, dp, graphs, trees

Keyboard Purchase

bitmasks, dp

Balanced Reversals

constructive algorithms

Balanced Distribution

data structures, dp, greedy

Balanced Domino Placements

combinatorics, dp

Balanced Binary Search Trees

dp, math

Balanced Playlist

binary search, data structures, implementation

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Alice and the Unfair Game

binary search, data structures, dp, dsu

Alice and the Doll

brute force, data structures, greedy, implementation

Yet Another Substring Reverse

bitmasks, dp

Special Permutations

math

Middle-Out

constructive algorithms, greedy, strings

One Node is Gone

constructive algorithms, implementation, trees

Another Filling the Grid

combinatorics, dp, math

Not Same

constructive algorithms

Wrong Answer on test 233 (Hard Version)

combinatorics, math

Wrong Answer on test 233 (Easy Version)

dp

Arson In Berland Forest

binary search, graphs, graphs, shortest paths

To Make 1

bitmasks, constructive algorithms, dp, greedy, number theory

Tree Factory

constructive algorithms, greedy, trees

Rock Is Push

binary search, dp

Wooden Raft

binary search, math, number theory

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Paint the Tree

dp, sortings, trees

Sequence Sorting

dp, greedy, two pointers

Graph And Numbers

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

Choose a Square

binary search, data structures, sortings

Game With String

games

Geolocation

geometry

Gardener Alex

binary search, data structures

Tourism

dfs and similar, dp, dsu, graphs, greedy, trees

Harvester

implementation

The Light Square

2-sat, dfs and similar, greedy

Function Composition

dfs and similar

Alpha planetary system

constructive algorithms, graphs, shortest paths

Product Tuples

divide and conquer, fft

Xor Spanning Tree

divide and conquer, fft, graphs

Jumping Transformers

dp

Guarding warehouses

data structures, geometry

BubbleReactor

dp, graphs

Forced Online Queries Problem

data structures, divide and conquer, dsu, graphs, trees

Sum Queries?

data structures, greedy, implementation, math

Coloring Edges

constructive algorithms, dfs and similar, graphs

Wi-Fi

data structures, dp, greedy

Numerical Sequence (hard version)

binary search, math

Radio Stations

2-sat

Marbles

bitmasks, dp