Good Substrings

combinatorics, data structures, data structures, dp, greedy, greedy, strings

Tea Blend

hashing, math, number theory

Floor of MEX (Hard Version)

dp, implementation, math

What Does the Cow Say?

binary search, data structures, dfs and similar, greedy, trees

Binary Bubble Sort Inversions

data structures, math, two pointers

Hypercarp and Interdimensional Jumps

binary search, brute force, geometry, greedy, implementation, math

Permutation Construction

constructive algorithms, data structures, sortings

The 67th Iteration of "Counting is Fun"

implementation, math

Equal Multisets (Hard Version)

constructive algorithms, dsu, greedy

Ghostfires

constructive algorithms, greedy

Tree Orientation (Easy Version)

constructive algorithms, dfs and similar, dsu, graphs, greedy, matrices, trees

Reflect Sort

number theory

Sum of Digits (and Again)

brute force, constructive algorithms, math

Two Arrays

*special problem, math

Interactive Graph (Simple Version)

binary search, combinatorics, dfs and similar, dp, graphs, interactive

Cost of Tree

dp, greedy, trees, trees

XOR-convenience (Hard Version)

bitmasks, constructive algorithms, math

Shortest Statement Ever

bitmasks, constructive algorithms, dp, greedy

Mixing MEXes

data structures, implementation, math

Exquisite Array

combinatorics, data structures, dsu, sortings

New Year's Gifts

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

Blackslex and Girls

constructive algorithms, geometry, math

Fibonacci Paths

data structures, dp, graphs, sortings

Buses

greedy, sortings

Copy String

greedy, implementation, strings, two pointers

Batteries

brute force, constructive algorithms, graph matchings, graphs, interactive, math

Not Alone

dp, greedy

Gravity Falls

greedy, implementation, sortings

Inversion Value of a Permutation

constructive algorithms, dfs and similar, dp

Price Tags

brute force, dp, math

Inversion Graph Coloring (Easy Version)

combinatorics, data structures, dp, greedy, two pointers

Avoid Minimums

*special problem, greedy, math

Minimum on Subarrays

*special problem, brute force

Maple and Tree Beauty (Easy Version)

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

Root was Built by Love, Broken by Destiny

combinatorics, dfs and similar, graphs, trees

Yamakasi

binary search, brute force, data structures, greedy, two pointers

Matrix game

combinatorics, math

Wildflower

combinatorics, dfs and similar, trees

Wolf

binary search, greedy, math

Quartet Swapping

brute force, data structures, divide and conquer, greedy, sortings

Hackers and Neural Networks

bitmasks, brute force, greedy

Mishkin Energizer

brute force, constructive algorithms, greedy, implementation, strings

Igor and Mountain

binary search, brute force, dp

Math Division

bitmasks, dp, math, probabilities

Cute Subsequences

*special problem, sortings

Scammy Game Ad

dp, greedy, implementation

Infinite Sequence (Easy Version)

bitmasks, brute force, dp, implementation, math

Palindrome Shuffle

binary search, greedy, hashing, strings, two pointers

Mirror Maze

brute force, dfs and similar, graphs, implementation

Problem about GCD

brute force, flows, math, number theory

Competitive Fishing

greedy

Shohag Loves XOR (Hard Version)

bitmasks, brute force, math, number theory

Yet Another Real Number Problem

binary search, data structures, divide and conquer, greedy, implementation, math

Kosuke's Sloth

brute force, math, number theory

Genokraken

constructive algorithms, data structures, graphs, greedy, implementation, interactive, trees, two pointers

Attribute Checks

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

Gerrymandering

dp, implementation

Connect the Dots

brute force, dp, dsu, graphs, math, trees

Rendez-vous de Marian et Robin

dfs and similar, graphs, shortest paths

Sakurako's Task

binary search, greedy, math, number theory

Iris and the Tree

brute force, data structures, dfs and similar, dsu, math, trees

Lazy Narek

dp, implementation, strings

Squaring

brute force, constructive algorithms, greedy, implementation, math, number theory

Grid Puzzle

bitmasks, brute force, dp, greedy, implementation

World is Mine

dp, games

Turtle and an Incomplete Sequence

bitmasks, brute force, constructive algorithms, greedy, implementation, math

Fixing a Binary String

bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings

Money Buys Happiness

dp

Trails (Easy)

dp

Equal XOR Segments

binary search, data structures

Missing Subsequence Sum

bitmasks, constructive algorithms, greedy, number theory

Unfair Game

dp, games, greedy, math, schedules

Colored Balls

combinatorics, dp, math, sortings

Disks

dfs and similar, geometry, graph matchings, graphs

Rudolf and Imbalance

binary search, greedy, sortings, two pointers

Exam in MAC

binary search, combinatorics, implementation, math

Messenger in MAC

binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings

Sum over all Substrings (Easy Version)

brute force, dp, greedy, strings

Slimes

binary search, constructive algorithms, data structures, greedy, two pointers

Increasing Subsequences

bitmasks, constructive algorithms, divide and conquer, greedy, math

Bicycles

graphs, greedy, implementation, shortest paths, sortings

Kim's Quest

bitmasks, combinatorics, dp

Remove and Add

*special problem, greedy

Shift and Reverse

greedy, sortings

Set To Max (Hard Version)

constructive algorithms, data structures, divide and conquer, greedy, implementation, sortings

Selling a Menagerie

dfs and similar, dsu, graphs, implementation, math

Prefix Purchase

greedy, implementation, sortings

Cyclic Operations

brute force, constructive algorithms, dfs and similar, graphs, greedy, implementation

Magic Will Save the World

binary search, bitmasks, brute force, dp

Sorting By Multiplication

dp, greedy

Andrey and Escape from Capygrad

binary search, data structures, dp, dsu, greedy, sortings

PermuTree (easy version)

dfs and similar, dp, trees

Imbalanced Arrays

constructive algorithms, graphs, greedy, math, sortings, two pointers

Ntarsis' Set

binary search, math, number theory

Lisa and the Martians

bitmasks, greedy, math, strings, trees

Vika and Price Tags

math, number theory

Rudolph and Mimic

constructive algorithms, implementation, interactive

Rudolf and Snowflakes (hard version)

binary search, brute force, implementation, math

Rating System

binary search, brute force, data structures, dp, dsu, greedy, math, two pointers

Omsk Metro (simple version)

data structures, dfs and similar, dp, graphs, greedy, math, trees