Make Equal

greedy

Recovering a Small String

brute force, strings

Counting Is Fun

combinatorics

Interactive Mex Tree

constructive algorithms, dfs and similar, interactive, trees

Prefix Max Set Counting

data structures, dp, trees

Maximize the Difference

bitmasks, brute force, dfs and similar

2..3...4.... Wonderful! Wonderful!

combinatorics, dp, math

Sum over all Substrings (Hard Version)

bitmasks, divide and conquer, dp, dsu, greedy, implementation, strings

Sum over all Substrings (Easy Version)

brute force, dp, greedy, strings

Lexicographically Largest

binary search, constructive algorithms, data structures, greedy, sortings

Permutation Printing

brute force, constructive algorithms, math

Maximise The Score

greedy, sortings

Sasha and the Wedding Binary Search Tree

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

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Sasha and a Walk in the City

combinatorics, dp, math, trees

Sasha and the Casino

binary search, brute force, constructive algorithms, games, greedy, math

Sasha and the Drawing

constructive algorithms, greedy, math

Sasha and the Beautiful Array

constructive algorithms, greedy, math, sortings

Digital Patterns

combinatorics, data structures, implementation, math

Modular Sequence

brute force, constructive algorithms, dp, graphs, greedy, math, number theory

Lonely Mountain Dungeons

brute force, data structures, greedy, math, ternary search

Physical Education Lesson

brute force, math, number theory

Equalize

binary search, greedy, sortings, two pointers

Rectangle Cutting

geometry, math

Paint Charges

data structures, dp, greedy, math

Microcycle

data structures, dfs and similar, dsu, graphs, greedy, implementation, sortings, trees

Klever Permutation

constructive algorithms, math, two pointers

Find the Different Ones!

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

Choose the Different Ones!

brute force, greedy, math

Following the String

constructive algorithms, greedy, strings

Make it White

greedy, strings

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Vlad and Avoiding X

bitmasks, brute force, dfs and similar, dp, implementation

Vlad and an Odd Ordering

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

Vlad and Division

bitmasks, greedy

Vlad and a Sum of Sum of Digits

dp, implementation

Vlad and Shapes

geometry, implementation

Vlad and the Best of Five

implementation

Good Trip

combinatorics, dp, math, probabilities

A Balanced Problemset?

brute force, greedy, math, number theory

We Got Everything Covered!

constructive algorithms, greedy, strings

Anti-Proxy Attendance

constructive algorithms, dp, interactive, ternary search

Paper Cutting Again

combinatorics, probabilities

Balanced Subsequences

combinatorics, dp, math

Fractal Origami

geometry, math, matrices

Space Harbour

data structures, implementation, math, sortings

Did We Get Everything Covered?

constructive algorithms, dp, greedy, shortest paths, strings

Shrink-Reverse

binary search, brute force, greedy, hashing, implementation, string suffix structures, strings

Count Paths

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

Slimes

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

Find B

constructive algorithms, greedy

Monsters Attack!

dp, greedy, implementation

Moving Chips

greedy, implementation

Replace on Segment

dp, graph matchings

Increasing Subsequences

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

Berserk Monsters

brute force, data structures, dsu, implementation, math

Closest Cities

greedy, implementation, math

Forming Triangles

combinatorics, constructive algorithms, math, sortings

Tricky Template

constructive algorithms, implementation, strings

Mischievous Shooter

brute force, data structures, divide and conquer, dp, implementation

Sum of Progression

brute force, data structures, dp, implementation, math

Eat the Chip

brute force, games, greedy, math

Very Different Array

data structures, greedy, sortings, two pointers

Sending Messages

greedy, math

Arranging Cats

greedy, implementation

Square

greedy, math

Smooth Sailing (Hard Version)

binary search, data structures, dsu, geometry, graphs, trees

Smooth Sailing (Easy Version)

binary search, brute force, data structures, dfs and similar, dsu, graphs, shortest paths

Counting Binary Strings

combinatorics, dp, math

Array Repetition

binary search, brute force, dsu, implementation, math

Partitioning the Array

brute force, math, number theory

Summation Game

games, greedy, math, sortings

Satisfying Constraints

brute force, greedy, math

Tree Diameter

interactive, trees

Tree LGM

constructive algorithms, divide and conquer, games, trees

Wine Factory (Hard Version)

data structures, dp, flows, greedy, matrices

Wine Factory (Easy Version)

data structures, greedy

Counting Prefixes

combinatorics, constructive algorithms, dp, implementation, math

01 Tree

constructive algorithms, data structures, dsu, greedy, sortings, trees

Grouping Increases

data structures, dp, greedy

Plus-Minus Split

greedy

Wallet Exchange

games, math

Permutation of Given

constructive algorithms, math

Caterpillar on a Tree

dfs and similar, graphs, greedy, implementation, sortings, trees

ace5 and Task Order

constructive algorithms, divide and conquer, implementation, interactive, probabilities, sortings

Blocking Elements

binary search, data structures, dp, implementation, two pointers

XOR-distance

bitmasks, greedy, implementation, math

Minimize Inversions

constructive algorithms, data structures, greedy, implementation, sortings

Brick Wall

constructive algorithms, greedy, implementation, math

Construct Tree

bitmasks, constructive algorithms, dp, trees

Construct Matrix

constructive algorithms, math

Yet Another Inversions Problem

combinatorics, data structures, dp, implementation, math, number theory

Watering an Array

brute force, greedy, implementation, math

Erase First or Second Letter

brute force, combinatorics, data structures, dp, strings

Least Product

constructive algorithms, math

Matrix Rank (Hard Version)

combinatorics, dp, math, matrices, string suffix structures

Matrix Rank (Easy Version)

brute force, combinatorics, dp, math, matrices

Optimizations From Chelsu

divide and conquer, dp, number theory, trees

Group Division

constructive algorithms, dfs and similar, graphs, greedy

Happy Life in University

data structures, dfs and similar, greedy, trees