Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

Summer Earnings

binary search, bitmasks, brute force, geometry, sortings

New Year and Castle Construction

combinatorics, geometry, math, sortings

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Tenzing and Tree

dfs and similar, greedy, shortest paths, sortings, trees

Expected diameter of a tree

binary search, brute force, dfs and similar, dp, sortings, trees

Sanae and Giant Robot

binary search, brute force, data structures, dsu, greedy, sortings

Oranges and Apples

constructive algorithms, sortings

Mastermind

constructive algorithms, graph matchings, greedy, implementation, sortings, two pointers

Two Editorials

brute force, dp, greedy, sortings, two pointers

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Inversion SwapSort

constructive algorithms, greedy, sortings

Sort the Table

*special problem, sortings

Looking for Owls

binary search, data structures, geometry, hashing, sortings

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Gripping Story

binary search, data structures, sortings

Place Your Ad Here

data structures, sortings

Renovation

constructive algorithms, greedy, sortings

Buses and People

binary search, data structures, sortings

Four Divisors

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

Katya and Segments Sets

data structures, interactive, sortings

Bear and Contribution

data structures, greedy, sortings, two pointers

New Year and Three Musketeers

data structures, greedy, sortings

Morse Code

binary search, data structures, dp, hashing, sortings, string suffix structures, strings

Choose a Square

binary search, data structures, sortings

New Year and the Acquaintance Estimation

binary search, data structures, graphs, greedy, implementation, math, sortings

Array Equalizer

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

Pokémon Arena

data structures, graphs, greedy, implementation, shortest paths, sortings

Rooks and Rectangles

data structures, sortings

Doremy's Number Line

dp, greedy, sortings

Median on Segments (General Case Edition)

sortings

Leaf Sets

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

Cyclic Shifts Sorting

brute force, constructive algorithms, implementation, sortings

I Wanna be the Team Leader

bitmasks, constructive algorithms, dp, greedy, math, sortings, two pointers

DFS Trees

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

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

Flying Sort (Hard Version)

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

Spanning Tree Queries

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

Plan of Lectures

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

Walk the Runway

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

Hyperregular Bracket Strings

combinatorics, greedy, hashing, math, number theory, sortings

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Mike and distribution

constructive algorithms, sortings

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Avoid Rainbow Cycles

data structures, dsu, graphs, greedy, sortings, trees

Ball

data structures, sortings

DeadLee

data structures, dfs and similar, greedy, implementation, sortings

Divide Square

data structures, geometry, implementation, sortings

Subarray Sorting

data structures, sortings

Blood Cousins Return

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

Table Bowling

*special problem, sortings

Array sorting

*special problem, sortings

Inquisition

geometry, implementation, sortings

Transportation

greedy, sortings, two pointers

Castle

dp, greedy, probabilities, sortings, trees

Wilbur and Trees

dp, math, probabilities, sortings

Curfew

binary search, brute force, greedy, sortings

Beautiful Road

dfs and similar, dp, dsu, graphs, implementation, sortings, trees

New Passenger Trams

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

Guess Your Way Out! II

data structures, implementation, sortings

Bamboo Partition

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

Mice problem

geometry, implementation, math, sortings

Exotic Queries

data structures, implementation, sortings

Three Chairs

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

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

Infinite Card Game

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

Yet Another Segments Subset

data structures, dp, graphs, sortings

Scalar Queries

combinatorics, data structures, math, sortings

PermutationForces II

brute force, combinatorics, greedy, sortings, trees, two pointers

Culture Code

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

Earth Wind and Fire

constructive algorithms, greedy, math, sortings, two pointers

Delete a Segment

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

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

Excellent Arrays

binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers

Optimal Insertion

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

Binary Spiders

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

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Asterism (Hard Version)

binary search, combinatorics, dp, math, number theory, sortings

Edges in MST

dfs and similar, dsu, graphs, sortings

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

Returning Home

graphs, shortest paths, sortings

Double Profiles

graphs, hashing, sortings

Team Building

bitmasks, dp, greedy, sortings

Physical Education Lessons

data structures, implementation, sortings

Nearest vectors

geometry, sortings

Sonya and Problem Wihtout a Legend

dp, sortings

A Simple Task

data structures, sortings, strings

Item World

brute force, implementation, sortings

Representative Sampling

dp, sortings, strings

Cannon

data structures, geometry, sortings

Ancient Language

graphs, sortings

Printer

binary search, data structures, implementation, sortings

Petya and Tree

binary search, dfs and similar, probabilities, sortings, trees

Lucky Tickets

binary search, data structures, sortings, two pointers

The Doctor Meets Vader (Medium)

flows, graph matchings, graphs, shortest paths, sortings

Paint Tree

constructive algorithms, divide and conquer, geometry, sortings, trees