Fruit Sequences

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

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Voting (Hard Version)

binary search, data structures, greedy

Kindergarten

data structures, dp, greedy

XOR Tree

bitmasks, data structures, dfs and similar, dsu, greedy, trees

Subarray Sorting

data structures, sortings

Till I Collapse

data structures, divide and conquer

DZY Loves Colors

data structures

Lucky Queries

data structures

Blood Cousins Return

binary search, data structures, dfs and similar, dp, sortings

DZY Loves Fibonacci Numbers

data structures, math, number theory

Cats Transport

data structures, dp

One Occurrence

data structures, divide and conquer

The Fair Nut and Rectangles

data structures, dp, geometry

Buy Low Sell High

constructive algorithms, data structures, greedy

Tree and Queries

data structures, dfs and similar, trees

Xenia and Tree

data structures, divide and conquer, trees

Dogecoin

*special problem, *special problem, binary search, data structures

Spring cleaning

*special problem, data structures, dfs and similar, graphs, trees

Summer Homework

data structures, math

Awards For Contestants

brute force, data structures, dp

Summer Homework

data structures, math

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Biathlon Track

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

Tourist

binary search, data structures, dp

Chip Play

brute force, data structures, implementation

Queue

data structures

Mashmokh and Water Tanks

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

Alex and Complicated Task

data structures, dp, greedy

Timetable

constructive algorithms, data structures, greedy, math

Zbazi in Zeydabad

data structures, implementation

Illusions of the Desert

data structures, trees

Sereja and Two Sequences

data structures, dp

Similar Sets

data structures, graphs, implementation

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Eyes Closed

data structures, probabilities

Famil Door and Roads

combinatorics, data structures, dfs and similar, dp, probabilities, trees

Teams Formation

data structures, implementation

Ann and Half-Palindrome

data structures, dp, graphs, string suffix structures, strings, trees

New Passenger Trams

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

wxhtzdy ORO Tree

binary search, bitmasks, brute force, data structures, dfs and similar, implementation, trees

Guess Your Way Out! II

data structures, implementation, sortings

Games on a CD

data structures, hashing, string suffix structures, strings

Decomposition

binary search, brute force, data structures, divide and conquer, dp, two pointers

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

Li Hua and Array

brute force, data structures, dsu, math, number theory, two pointers

Bamboo Partition

brute force, data structures, implementation, math, number theory, sortings, two pointers

Light Bulbs (Hard Version)

combinatorics, data structures, dfs and similar, dp, graphs, hashing

Game with Stones

binary search, data structures, games, greedy

Chain Chips

data structures, dp, matrices

Rectangle Shrinking

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

Periodic RMQ Problem

data structures

Queue in the Train

data structures, greedy, implementation

Exotic Queries

data structures, implementation, sortings

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Sereja and Squares

binary search, data structures, hashing

New Year Domino

data structures, dp, dsu

Intersection and Union

data structures, dp, matrices, probabilities

Scalar Queries

combinatorics, data structures, math, sortings

Vika and Segments

constructive algorithms, data structures, geometry, two pointers

Infinite Card Game

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

Culture Code

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

Omsk Metro (hard version)

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

Paint Charges

data structures, dp, greedy, math

Beautiful Rectangle

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

Max to the Right of Min

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

There Should Be a Lot of Maximums

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

Tenzing and Triangle

data structures, dp, geometry, greedy, math

Vanya and Treasure

data structures, dp, graphs, shortest paths

Animal Observation (easy version)

data structures, dp

Unique Occurrences

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

Yet Another Segments Subset

data structures, dp, graphs, sortings

Sasha and the Wedding Binary Search Tree

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

Ann and Books

data structures, flows, hashing

Yet Another Inversions Problem

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

Sum Queries?

data structures, greedy, implementation, math

Alice and the Doll

brute force, data structures, greedy, implementation

Red-Black Pepper

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

Subtree Minimum Query

data structures, trees

Delete a Segment

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

K Integers

binary search, data structures

Yet Another Array Counting Problem

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

Company

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

New School

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

Leaving the Bar

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

Number of Groups

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

Colors and Intervals

constructive algorithms, data structures, greedy, sortings

Multidimensional Queries

bitmasks, data structures

Boxes And Balls

data structures, greedy

Merging Towers

data structures, dsu, implementation, trees

Sum of Medians

binary search, brute force, data structures, implementation

Optimal Insertion

data structures, divide and conquer, dp, greedy, sortings

Binary Spiders

bitmasks, data structures, implementation, math, sortings, trees

Mark and Professor Koro

binary search, bitmasks, brute force, combinatorics, data structures, greedy

Arithmetic Operations

brute force, data structures, graphs, math

Wine Factory (Easy Version)

data structures, greedy

Game of the Year

brute force, data structures, math, number theory

MEX of LCM

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

Drazil and Park

data structures

Happy Life in University

data structures, dfs and similar, greedy, trees