Number of Groups

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

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Big Maximum Sum

data structures, dp, greedy, implementation, math, trees

Yet Another Array Counting Problem

binary search, data structures, divide and conquer, dp, flows, math, trees

Leaving the Bar

brute force, data structures, geometry, greedy, math, sortings

Beaver

data structures, dp, greedy, hashing, strings, two pointers

Two Strings

data structures, dp, strings

New School

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

Colorful Points

data structures, greedy, implementation

Order book

combinatorics, data structures, greedy

Company

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

Permutation recovery

constructive algorithms, data structures, dfs and similar, graphs, greedy, math, sortings

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Nearest Leaf

data structures, trees

Greedy Shopping

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

Train Maintenance

brute force, data structures, implementation

String Set Queries

brute force, data structures, hashing, interactive, string suffix structures, strings

Subtree Minimum Query

data structures, trees

Yet Another Inversions Problem

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

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

K Integers

binary search, data structures

A-Z Graph

constructive algorithms, data structures, graphs, hashing

Red-Black Pepper

brute force, data structures, greedy, math, number theory

Insertion Sort

data structures, dp, implementation, math

Chopping Carrots (Hard Version)

brute force, constructive algorithms, data structures, dp, greedy, math, number theory, two pointers

GukiZ and GukiZiana

binary search, data structures, implementation

Alice and the Doll

brute force, data structures, greedy, implementation

You Are Given a Tree

data structures, dp, trees

Sum Queries?

data structures, greedy, implementation, math

Arthur and Walls

constructive algorithms, data structures, graphs, greedy, shortest paths

Sasha and the Wedding Binary Search Tree

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

Ann and Books

data structures, flows, hashing

Vlad and the Nice Paths (hard version)

binary search, combinatorics, data structures, dp, math, two pointers

Lucky Array

data structures

Changing Brackets

constructive algorithms, data structures, dp, greedy

Mister B and PR Shifts

data structures, implementation, math

Artem and Array

data structures, greedy

Network Coverage

binary search, constructive algorithms, data structures, greedy

DNA Evolution

data structures, strings

Long Way Home

data structures, divide and conquer, dp, geometry, graphs, greedy, shortest paths

Frequency Problem (Easy Version)

data structures, greedy

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Fair Share

constructive algorithms, data structures, dfs and similar, graph matchings, graphs

Minimum Array

binary search, brute force, constructive algorithms, data structures, greedy, hashing, two pointers

Beard Graph

data structures, dsu, trees

Jamie and Tree

data structures, trees

Letters Removing

data structures, strings

Scalar Queries

combinatorics, data structures, math, sortings

Animal Observation (easy version)

data structures, dp

Square-free division (hard version)

data structures, dp, greedy, math, number theory, two pointers

The Number of Subpermutations

brute force, data structures, divide and conquer, hashing, math

LaIS

data structures, dp, greedy

Yet Another Segments Subset

data structures, dp, graphs, sortings

Treeland Tour

data structures, dfs and similar, dp, trees

Little Girl and Problem on Trees

data structures, graphs, trees

Cactus

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

Tenzing and Triangle

data structures, dp, geometry, greedy, math

Unique Occurrences

data structures, dfs and similar, divide and conquer, dp, dsu, trees

Kazaee

data structures, hashing, probabilities

AI robots

data structures

Monsters (hard version)

data structures, greedy

Vanya and Treasure

data structures, dp, graphs, shortest paths

There Should Be a Lot of Maximums

brute force, data structures, dfs and similar, dp, trees, two pointers

Fibonacci Additions

brute force, data structures, hashing, implementation, math

Reverse and Swap

binary search, bitmasks, data structures

e-Government

data structures, dfs and similar, dp, strings, trees

On Changing Tree

data structures, graphs, trees

Grouped Carriages

binary search, data structures, dp, flows, greedy

Drazil Likes Heap

constructive algorithms, data structures, greedy, implementation

Bear and Bowling 4

binary search, data structures, divide and conquer, geometry, ternary search

Tonya and Burenka-179

data structures, greedy, math, number theory

Max to the Right of Min

binary search, data structures, divide and conquer, dp, dsu, two pointers

Cross Swapping

2-sat, data structures, dsu, greedy, matrices

REQ

data structures, number theory

Old Berland Language

data structures, greedy, trees

Walk the Runway

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

Culture Code

binary search, combinatorics, data structures, dp, shortest paths, sortings

Paint Charges

data structures, dp, greedy, math

A Heap of Heaps

brute force, data structures, math, sortings

Intersection of Permutations

data structures

Trader Problem

data structures, dsu, greedy, sortings

Omsk Metro (hard version)

data structures, dfs and similar, divide and conquer, dp, math, trees

The Untended Antiquity

data structures, hashing

Beautiful Rectangle

brute force, combinatorics, constructive algorithms, data structures, greedy, math

New Year and Old Subsequence

data structures, divide and conquer, dp, matrices

Three Occurrences

data structures, divide and conquer, hashing, two pointers

Infinite Card Game

binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, greedy, sortings, two pointers

Ina of the Mountain

data structures, dp, greedy, math

Team-Building

data structures, dfs and similar, dsu, graphs

Spanning Tree Queries

binary search, data structures, dfs and similar, dsu, graphs, greedy, math, sortings, trees

Ray in the tube

data structures, divide and conquer, dp, math

Substrings in a String

bitmasks, brute force, data structures, string suffix structures, strings

Flying Sort (Hard Version)

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

Vika and Segments

constructive algorithms, data structures, geometry, two pointers

Summer Homework

brute force, data structures

Santa Claus and Tangerines

binary search, data structures, greedy, two pointers

Counter Attack

data structures, dsu, graphs, hashing, sortings

MinimizOR

bitmasks, brute force, data structures, divide and conquer, greedy, implementation, two pointers

Complete the MST

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

Intersection and Union

data structures, dp, matrices, probabilities