k-th equality

brute force, implementation, math

MEX of LCM

binary search, data structures, implementation, math, number theory

Survey in Class

brute force, data structures, greedy, implementation, sortings

Ksyusha and Chinchilla

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

Ira and Flamenco

combinatorics, constructive algorithms, data structures, implementation, math, sortings, two pointers

Musical Puzzle

implementation, strings

Red-Blue Operations (Hard Version)

binary search, constructive algorithms, greedy, implementation, math

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

Contrast Value

greedy, implementation

Hits Different

data structures, dp, implementation, math

The Lakes

dfs and similar, dsu, graphs, implementation

Gold Rush

brute force, dfs and similar, dp, implementation

Mr. Perfectly Fine

bitmasks, greedy, implementation

Blank Space

implementation

Love Story

implementation, strings

Walk the Runway

bitmasks, brute force, data structures, dp, graphs, implementation, sortings

Trust Nobody

brute force, greedy, implementation, sortings

LuoTianyi and the Show

greedy, implementation

TubeTube Feed

brute force, implementation

Tear It Apart

brute force, implementation, math, strings

Yura's New Name

implementation, strings

The Fox and the Complete Tree Traversal

constructive algorithms, dp, implementation, math, trees

The Butcher

geometry, greedy, implementation, sortings, two pointers

Politics

greedy, implementation

Toy Machine

constructive algorithms, games, implementation

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Coins

implementation, math

Colour Vision

*special problem, implementation

Was it Rated?

*special problem, *special problem, *special problem, brute force, implementation

Is It Flower?

dfs and similar, graphs, implementation

Umka and a Long Flight

constructive algorithms, implementation, math

Conveyor Belts

implementation, math

Traveling in Berland

binary search, data structures, graphs, greedy, implementation

Two Tanks

binary search, dp, implementation, math

Garland

implementation

Unlucky Numbers

brute force, dp, greedy, implementation

Lucky Numbers

brute force, implementation

Subsequence Addition (Hard Version)

bitmasks, dp, greedy, implementation, sortings

Subsequence Addition (Easy Version)

brute force, data structures, dp, greedy, implementation, sortings

Bouncy Ball

brute force, dfs and similar, implementation

Interview

binary search, implementation, interactive

Odd Queries

data structures, implementation

Find and Replace

greedy, implementation, strings

Plus or Minus

implementation

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

Flow Control

data structures, dsu, implementation

Accommodation

brute force, dp, greedy, implementation

Vaccination

greedy, implementation

Settlement of Guinea Pigs

greedy, implementation, math

Likes

greedy, implementation

Symmetree

dfs and similar, hashing, implementation, trees

Is It a Cat?

implementation, strings

City Union

constructive algorithms, dfs and similar, dsu, geometry, greedy, implementation, math

Recent Actions

data structures, greedy, implementation, math

Three Sevens

brute force, data structures, greedy, implementation

Showstopper

greedy, implementation, sortings

Li Hua and Tree

brute force, data structures, dfs and similar, dp, implementation, trees

Li Hua and Maze

constructive algorithms, flows, graphs, greedy, implementation

Asterisk-Minor Template

implementation, strings

Typical Interview Problem

brute force, implementation, strings

Tea Tasting

binary search, data structures, implementation

Two Towers

brute force, implementation, strings

Labeling the Tree with Distances

data structures, dp, greedy, hashing, implementation, trees

Rebrending

brute force, data structures, divide and conquer, implementation

Moscow Gorillas

binary search, dp, greedy, implementation, math, two pointers

Prepend and Append

implementation, two pointers

Following Directions

geometry, implementation

Codeforces Checking

implementation, strings

Premutation

brute force, implementation, math

Polycarp and the Day of Pi

implementation, math, strings

Serval and Brain Power

bitmasks, brute force, dp, greedy, implementation, strings

Serval and Music Game

brute force, dp, implementation, math, number theory

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

Serval and Toxel's Arrays

combinatorics, dp, implementation, math

Serval and Inversion Magic

brute force, implementation, strings, two pointers

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Sum of Two Numbers

constructive algorithms, greedy, implementation, math, probabilities

One and Two

brute force, implementation, math

Inverse Transformation

constructive algorithms, implementation, math

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation

Alternating Deck (hard version)

implementation

Non-alternating Deck (easy version)

implementation

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Different Arrays

brute force, dp, implementation

Rectangle Shrinking

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

Equal Frequencies

brute force, constructive algorithms, greedy, implementation, sortings, strings

Flip Flop Sum

greedy, implementation

The Human Equation

greedy, implementation

Gardener and the Capybaras (easy version)

brute force, constructive algorithms, implementation

Magician and Pigs (Hard Version)

binary search, brute force, data structures, implementation

Magician and Pigs (Easy Version)

brute force, data structures, implementation

Same Count One

brute force, constructive algorithms, greedy, implementation, two pointers

Interactive Factorial Guessing

brute force, games, implementation, interactive

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

Gaining Rating

binary search, greedy, implementation, math, sortings, two pointers

Copy of a Copy of a Copy

constructive algorithms, dfs and similar, graphs, implementation, sortings

Matrix Rotation

brute force, implementation

A+B?

implementation

Hossam and a Letter

brute force, dp, implementation, two pointers

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation