IQ test

brute force

Registration System

data structures, hashing, implementation

T-primes

binary search, implementation, math, number theory

Cut Ribbon

brute force, dp

Boredom

dp

Two Buttons

dfs and similar, graphs, greedy, implementation, math, shortest paths

Books

binary search, brute force, implementation, two pointers

Given Length and Sum of Digits...

dp, greedy, implementation

Sort the Array

implementation, sortings

Kefa and Park

dfs and similar, graphs, trees

Pashmak and Flowers

combinatorics, implementation, sortings

Two Substrings

brute force, dp, greedy, implementation, strings

Random Teams

combinatorics, constructive algorithms, greedy, math

Number of Ways

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

Product of Three Numbers

greedy, math, number theory

Buying Shovels

math, number theory

Dijkstra?

graphs, shortest paths

Dreamoon and WiFi

bitmasks, brute force, combinatorics, dp, math, probabilities

I Hate 1111

dp, math, number theory

Exams

greedy, sortings

Vacations

dp

K-th Beautiful String

binary search, brute force, combinatorics, implementation, math

Queries about less or equal elements

binary search, data structures, sortings, two pointers

Divisibility by Eight

brute force, dp, math

Little Girl and Game

games, greedy

Number of Pairs

binary search, data structures, math, two pointers

Pair of Topics

binary search, data structures, sortings, two pointers

Anti-Sudoku

constructive algorithms, implementation

Woodcutters

dp, greedy

Omkar and Last Class of Math

greedy, math, number theory

Trouble Sort

constructive algorithms, implementation

Jzzhu and Sequences

implementation, math

Winner

hashing, implementation

Drazil and Factorial

greedy, math, sortings

Kefa and Company

binary search, sortings, two pointers

Alice, Bob and Candies

implementation

k-Tree

dp, implementation, trees

Phoenix and Beauty

constructive algorithms, data structures, greedy, sortings

Polygon

dp, graphs, implementation, shortest paths

Good Subarrays

data structures, dp, math

Basketball Exercise

dp

Queue

greedy, implementation, sortings

Little Girl and Maximum Sum

data structures, greedy, implementation, sortings

Flowers

dp

Amr and Pins

geometry, math

Hamburgers

binary search, brute force

Xenia and Bit Operations

data structures, trees

Number Game

games, math, number theory

Mere Array

constructive algorithms, math, number theory, sortings

Subsequence Hate

implementation, strings

Powered Addition

greedy, math

Social Distance

constructive algorithms, greedy, math

Rotation Matching

constructive algorithms, data structures, greedy, implementation

Zero Remainder Array

math, sortings, two pointers

Plus and Multiply

constructive algorithms, math, number theory

Fadi and LCM

brute force, math, number theory

Anton and currency you all know

greedy, math, strings

Spreadsheet

implementation, math

Rumor

dfs and similar, graphs, greedy

Maximum Median

binary search, greedy, math, sortings

Maze

dfs and similar

3SUM

brute force, math

Strange Birthday Party

binary search, dp, greedy, sortings, two pointers

Potions (Easy Version)

brute force, data structures, dp, greedy

Just Eat It!

dp, greedy, implementation

Potions (Hard Version)

data structures, greedy

Coin Rows

brute force, constructive algorithms, dp, implementation

Mashmokh and ACM

combinatorics, dp, number theory

Nastia and a Good Array

constructive algorithms, math, number theory

Epic Transformation

constructive algorithms, data structures, greedy

Orac and Models

dp, math, number theory

Element Extermination

constructive algorithms, data structures, greedy

Han Solo and Lazer Gun

brute force, data structures, geometry, implementation, math

A Cookie for You

greedy, implementation, math

Arranging The Sheep

greedy, math

Ball in Berland

combinatorics, graphs, math

Tetrahedron

dp, math, matrices

Create The Teams

brute force, dp, greedy, implementation, sortings

Special Permutation

constructive algorithms

Prefix Flip (Easy Version)

constructive algorithms, data structures, strings

Number into Sequence

constructive algorithms, math, number theory

Common Divisors

implementation, math

Shuffle

math, two pointers

Preparing Olympiad

bitmasks, brute force

Inflation

binary search, brute force, greedy, math

Special Elements

brute force, implementation, two pointers

Linova and Kingdom

dfs and similar, dp, greedy, sortings, trees

A and B and Team Training

greedy, implementation, math, number theory

Cyclic Components

dfs and similar, dsu, graphs

Team

constructive algorithms, greedy, implementation

RationalLee

greedy, math, sortings, two pointers

Codeforces Subsequences

brute force, constructive algorithms, greedy, math, strings

Nastya and Door

greedy, implementation

Get an Even String

dp, greedy, strings

Find The Array

bitmasks, constructive algorithms, greedy

Decrease the Sum of Digits

greedy, math

Romantic Glasses

data structures, greedy, math

Most socially-distanced subsequence

greedy, two pointers

Find the Different Ones!

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

Accidental Victory

binary search, data structures, greedy