Hyperregular Bracket Strings

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

Walk the Runway

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

Culture Code

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

Mittens

constructive algorithms, greedy, sortings

A Heap of Heaps

brute force, data structures, math, sortings

Travel Cards

greedy, implementation, sortings

Two Editorials

brute force, dp, greedy, sortings, two pointers

Trader Problem

data structures, dsu, greedy, sortings

Infinite Card Game

binary search, brute force, data structures, dfs and similar, dp, dsu, games, graphs, 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

Gift

dsu, graphs, sortings, trees

Phone Talks

*special problem, dp, sortings

Flying Sort (Hard Version)

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

Counter Attack

data structures, dsu, graphs, hashing, sortings

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

Trading Business

greedy, sortings

Purple Crayon

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

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

DFS Trees

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

Mastermind

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

Mahmoud and Ehab and the function

binary search, data structures, sortings

Oh Sweet Beaverette

data structures, sortings

Compressed Tree

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

Difficult Mountain

data structures, dp, greedy, sortings

Three Chairs

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

Oranges and Apples

constructive algorithms, sortings

Sanae and Giant Robot

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

I Wanna be the Team Leader

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

Spider's Web

binary search, sortings, two pointers

Exotic Queries

data structures, implementation, sortings

Network Safety

dfs and similar, dsu, graphs, math, sortings

Geometry Horse

greedy, implementation, sortings, two pointers

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Gaining Rating

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

Cyclic Shifts Sorting

brute force, constructive algorithms, implementation, sortings

Expected diameter of a tree

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

Tenzing and Tree

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

Собери стол

constructive algorithms, sortings

Leaf Sets

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

Mice problem

geometry, implementation, math, sortings

Median on Segments (General Case Edition)

sortings

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Banquet Preparations 2

greedy, sortings, two pointers

Bamboo Partition

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

Doremy's Number Line

dp, greedy, sortings

Hydra

graphs, sortings

Rooks and Rectangles

data structures, sortings

80-th Level Archeology

brute force, data structures, greedy, sortings

Fancy Fence

*special problem, data structures, dsu, implementation, math, sortings

Knights

geometry, graphs, shortest paths, sortings

Bus

*special problem, implementation, sortings

Guess Your Way Out! II

data structures, implementation, sortings

Pokémon Arena

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

New Year and Castle Construction

combinatorics, geometry, math, sortings

Mice and Holes

data structures, dp, greedy, sortings

Summer Earnings

binary search, bitmasks, brute force, geometry, sortings

Before Exam

constructive algorithms, implementation, sortings

New Passenger Trams

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

Minimal String Xoration

bitmasks, data structures, divide and conquer, greedy, hashing, sortings, strings

Gojou and Matrix Game

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

Lovely Matrix

dfs and similar, graphs, greedy, sortings

Analyzing Polyline

geometry, math, sortings

Array Equalizer

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

Parametric MST

binary search, constructive algorithms, graphs, greedy, math, sortings

Zebra Tower

*special problem, data structures, greedy, sortings

Summoning Minions

constructive algorithms, dp, flows, graph matchings, greedy, sortings

New Year and the Acquaintance Estimation

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

Runner's Problem

dp, matrices, sortings

Playlist

math, probabilities, sortings

Choose a Square

binary search, data structures, sortings

Flip the Cards

2-sat, constructive algorithms, data structures, greedy, sortings, two pointers

Bicolored Segments

data structures, dp, graph matchings, sortings

Maximize The Value

data structures, sortings

Field Photography

bitmasks, data structures, sortings

Velepin and Marketing

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

Points Movement

data structures, dp, greedy, implementation, sortings

Doremy's Experimental Tree

brute force, constructive algorithms, dfs and similar, dsu, sortings, trees

Guard Towers

binary search, dsu, geometry, graphs, sortings

Hostname Aliases

*special problem, binary search, data structures, implementation, sortings, strings

Minimum Sum

divide and conquer, geometry, sortings

Reading Books (hard version)

data structures, greedy, implementation, sortings, ternary search, two pointers

Guard Duty (medium)

binary search, dp, greedy, sortings

Morse Code

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

Students' Revenge

data structures, greedy, sortings

The Boss's Identity

binary search, bitmasks, data structures, dfs and similar, greedy, math, sortings

Gerald and Path

dp, sortings

New Year and Three Musketeers

data structures, greedy, sortings

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Group Photo 2 (online mirror version)

brute force, greedy, sortings

Berland Elections

greedy, sortings

Beautiful Road

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

Mushroom Gnomes - 2

binary search, data structures, probabilities, sortings

Strange Array

data structures, greedy, sortings

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Curfew

binary search, brute force, greedy, sortings

Off by One

constructive algorithms, dfs and similar, geometry, graphs, sortings, trees

Boboniu and Jianghu

dp, greedy, sortings, trees

General Mobilization

data structures, dfs and similar, sortings