Changing Brackets

constructive algorithms, data structures, dp, greedy

Red-Black Number

dfs and similar, dp, implementation, math, meet-in-the-middle

Bored Bakry

bitmasks, greedy, math, two pointers

Hemose in ICPC ?

binary search, dfs and similar, implementation, interactive, math, number theory, trees

Poachers

dp, games, graphs, trees

Non-equal Neighbours

combinatorics, dp, math

Frequency Queries

data structures, dfs and similar, trees

Game with Stones

binary search, data structures, games, greedy

Guess the Permutation

binary search, combinatorics, interactive, math

Defender of Childhood Dreams

bitmasks, constructive algorithms, divide and conquer

Moment of Bloom

constructive algorithms, dfs and similar, graph matchings, graphs, greedy, trees

Korney Korneevich and XOR (hard version)

binary search, brute force, dp, greedy, two pointers

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

Train Maintenance

brute force, data structures, implementation

Minimal Coverage

dp

Labyrinth

binary search, dsu, greedy

Managing Telephone Poles

data structures, geometry

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Knitting Batik

implementation, math

Illusions of the Desert

data structures, trees

Holiday Wall Ornaments

dp, strings

GCD Festival

math, number theory

Building an Amusement Park

binary search, geometry

Coloring

combinatorics, constructive algorithms, implementation, math

The Strongest Build

binary search, brute force, data structures, dfs and similar, graphs, greedy, hashing, implementation

Xor of 3

brute force, constructive algorithms, greedy, two pointers

A Battle Against a Dragon

*special problem, data structures, dp

Kotlinforces

*special problem, constructive algorithms, dp

Non-Decreasing Dilemma

data structures, divide and conquer, math

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

Buds Re-hanging

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

Rescue Niwen!

dp, greedy, string suffix structures, strings

Two Hundred Twenty One (hard version)

data structures, math

Nearest Beautiful Number (hard version)

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy

Mocha and Stars

combinatorics, dp, fft, math, number theory

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Bottom-Tier Reversals

constructive algorithms, greedy

Ezzat and Grid

data structures, dp, greedy

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Equilibrium

data structures, dp, greedy

Boring Segments

data structures, sortings, trees, two pointers

Pairwise Modulo

data structures, math

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Telepanting

binary search, data structures, dp, sortings

Colors and Intervals

constructive algorithms, data structures, greedy, sortings

Equidistant Vertices

brute force, combinatorics, dfs and similar, dp, trees

Fixed Points

binary search, brute force, dp

Domino (hard version)

constructive algorithms, implementation, math

Stringforces

binary search, bitmasks, brute force, dp, strings, two pointers

Excellent Arrays

binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers

Gregor and the Odd Cows (Easy)

bitmasks, geometry, math, number theory

The Three Little Pigs

combinatorics, dp, fft, math

How Many Paths?

dfs and similar, dp, graphs, trees

RPD and Rap Sheet (Hard Version)

brute force, constructive algorithms, interactive, math

Abnormal Permutation Pairs (easy version)

combinatorics, dp, fft, math

Priority Queue

combinatorics, dp, implementation, math, ternary search

Tree Array

brute force, combinatorics, dp, graphs, math, probabilities, trees

Game with Cards

binary search, constructive algorithms, data structures, dp, greedy, implementation

Gift Set

binary search, greedy, math, ternary search

Funny Substrings

data structures, hashing, implementation, matrices, strings

Figure Fixing

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

Erase and Extend (Hard Version)

binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers

Omkar and Forest

combinatorics, graphs, math, shortest paths

Omkar and Medians

data structures, greedy, implementation

Gold Transfer

binary search, data structures, dp, greedy, interactive, trees

Falling Sand (Easy Version)

dfs and similar, graphs, greedy

Lost Array

graphs, greedy, interactive, shortest paths

Minimax

constructive algorithms, greedy, strings

It's a bird! No, it's a plane! No, it's AaParsa!

constructive algorithms, graphs, shortest paths

Trees of Tranquillity

data structures, dfs and similar, greedy, trees

Partition Game

binary search, data structures, divide and conquer, dp

MEX Tree

combinatorics, dfs and similar, implementation, math, trees

Oolimry and Suffix Array

combinatorics, constructive algorithms, math

Kill Anton

brute force, constructive algorithms, data structures, math, strings

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

Robot Collisions

data structures, greedy, implementation, sortings

Love-Hate

bitmasks, brute force, dp, probabilities

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Nastia and a Hidden Permutation

constructive algorithms, interactive

To Go Or Not To Go?

brute force, dfs and similar, graphs, greedy, implementation, shortest paths

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Group Photo

binary search, data structures, implementation, two pointers

Baby Ehab Plays with Permutations

combinatorics, dp, math

Cut

binary search, data structures, dp, graphs, number theory, two pointers

Phoenix and Computers

combinatorics, dp, math

Cut and Stick

binary search, data structures, greedy, implementation, sortings

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

GCD and MST

constructive algorithms, dsu, graphs, greedy, number theory, sortings

Colorings and Dominoes

combinatorics, dp, greedy, math

Guide

Digits

dp, math, number theory

Complete the MST

bitmasks, brute force, data structures, dfs and similar, dsu, graphs, greedy, trees

Maximize the Remaining String

brute force, data structures, dp, greedy, strings

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Mysterious language again, seriously?

*special problem

L BREAK into program

*special problem

Math

*special problem, math

Travelling Salesman Problem

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

Two chandeliers

binary search, brute force, chinese remainder theorem, math, number theory