Beautiful Bracket Sequence (easy version)

combinatorics, dp, probabilities

Beautiful Mirrors with queries

data structures, probabilities

Beautiful Sequence

brute force, constructive algorithms, greedy

Economic Difficulties

data structures, dfs and similar, dp, flows, graphs, trees

Editor

data structures, implementation

Xor-Set

bitmasks, divide and conquer, math

Colored Tree

data structures, trees

Tournament

brute force, dp, greedy

A Game with Traps

binary search, dp, greedy, sortings

Infinite Fence

greedy, math, number theory

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

Yet Another Monster Killing Problem

binary search, data structures, dp, greedy, sortings, two pointers

Equalizing Two Strings

constructive algorithms, sortings, strings

Yet Another Division Into Teams

dp, greedy, sortings

Platforms Jumping

greedy

League of Leesins

constructive algorithms, implementation

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

Send Boxes to Alice (Easy Version)

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

Feeding Chicken

constructive algorithms, greedy, implementation

Cheap Robot

binary search, dsu, graphs, shortest paths, trees

Antenna Coverage

data structures, dp, greedy, sortings

Harmonious Graph

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

Road Construction

flows, graphs

Addition Robot

data structures, math, matrices

Tiling Terrace

brute force, dp

Mission Possible

Twin Buildings

greedy, implementation

Performance Review

data structures

Regular Forestation

hashing, trees

Songwriter

greedy, two pointers

Find String in a Grid

data structures, dp, strings, trees

Even Path

data structures, implementation

Cleaning Robots

dp, trees

Red-White Fence

combinatorics, fft

Voting (Hard Version)

binary search, data structures, greedy

Voting (Easy Version)

data structures, dp, greedy

Salary Changing

binary search, greedy, sortings

Minimize The Integer

greedy, two pointers

Wires

dfs and similar, graphs, greedy

SmartGarden

constructive algorithms, divide and conquer

Projectors

flows, graphs

The Parade

binary search, greedy

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

The Feast and the Bus

brute force, constructive algorithms, greedy, math

Maximum Weight Subset

dp, trees

By Elevator or Stairs?

dp, shortest paths

Too Many Segments (hard version)

data structures, greedy, sortings

Too Many Segments (easy version)

greedy

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

Shichikuji and Power Grid

dsu, graphs, greedy, shortest paths, trees

Running in Pairs

constructive algorithms, greedy, math

Chips

constructive algorithms, implementation

Minimizing Difference

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

Paint the Tree

brute force, constructive algorithms, dp, graphs, implementation, trees

The Football Season

brute force, math, number theory

Character Swap (Hard Version)

strings

Planar Perimeter

constructive algorithms, graphs

Number Discovery

math

Sum Balance

bitmasks, dfs and similar, dp, graphs

0-1 MST

dfs and similar, dsu, graphs, sortings

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

Ivan the Fool and the Probability Theory

combinatorics, dp, math

Adilbek and the Watering System

data structures, greedy, sortings

The Maximum Subtree

dfs and similar, dp, graphs, trees

Keyboard Purchase

bitmasks, dp

AB-string

binary search, combinatorics, dp, strings

Standard Free2play

dp, greedy, math

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

Balanced Removals (Harder)

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

Balanced Removals (Easier)

constructive algorithms, geometry, greedy

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

Distinct Characters Queries

data structures

Middle-Out

constructive algorithms, greedy, strings

One Node is Gone

constructive algorithms, implementation, trees

Another Filling the Grid

combinatorics, dp, math