Three Chairs

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

Difficult Mountain

data structures, dp, greedy, sortings

DFS Trees

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

Oh Sweet Beaverette

data structures, sortings

Mahmoud and Ehab and the function

binary search, data structures, sortings

Mastermind

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

Purple Crayon

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

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

Trading Business

greedy, sortings

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

Gift

dsu, graphs, sortings, trees

Scalar Queries

combinatorics, data structures, math, sortings

Counter Attack

data structures, dsu, graphs, hashing, sortings

Plan of Lectures

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

Flying Sort (Hard Version)

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

Phone Talks

*special problem, dp, sortings

Spanning Tree Queries

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

Trader Problem

data structures, dsu, greedy, sortings

Two Editorials

brute force, dp, greedy, sortings, two pointers

Travel Cards

greedy, implementation, sortings

Walk the Runway

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

A Heap of Heaps

brute force, data structures, math, sortings

Mittens

constructive algorithms, greedy, sortings

Charming Meals

binary search, brute force, greedy, sortings

Hyperregular Bracket Strings

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

ace5 and Task Order

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

Yet Another Segments Subset

data structures, dp, graphs, sortings

PermutationForces II

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

Sockets

greedy, sortings

Event Dates

greedy, meet-in-the-middle, sortings

Doctor

binary search, math, sortings

Distributing Parts

greedy, sortings

Average Score

greedy, math, sortings

Ordering Pizza

binary search, sortings, ternary search

Delete a Segment

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

Earth Wind and Fire

constructive algorithms, greedy, math, sortings, two pointers

Unsorting Array

brute force, sortings

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

Permutation recovery

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

Sereja and the Arrangement of Numbers

graphs, greedy, sortings

New School

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

Leaving the Bar

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

Count The Rectangles

bitmasks, brute force, data structures, geometry, sortings

Number of Groups

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

Destroy it!

dp, implementation, sortings

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

Topforces Strikes Back

brute force, math, sortings

Colors and Intervals

constructive algorithms, data structures, greedy, sortings

Excellent Arrays

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

Water Taps

binary search, greedy, sortings

Yet Another Task with Queens

sortings

Rooter's Song

constructive algorithms, data structures, geometry, implementation, sortings, two pointers

Accumulator Apex

data structures, implementation, sortings

Two Houses

brute force, graphs, greedy, interactive, sortings

Mike and distribution

constructive algorithms, sortings

Characteristics of Rectangles

binary search, bitmasks, brute force, implementation, sortings

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Physical Education

sortings

Avoid Rainbow Cycles

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

Lie or Truth

*special problem, constructive algorithms, implementation, sortings

Optimal Insertion

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

Discounts

constructive algorithms, greedy, sortings

Ball

data structures, sortings

Ice Cream Shop

brute force, implementation, sortings

Time to Raid Cowavans

brute force, data structures, sortings

Binary Spiders

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

Ants in Leaves

dfs and similar, greedy, sortings, trees

Preparing for the Contest

binary search, data structures, greedy, sortings

The Art of Dealing with ATM

binary search, sortings

Permutation Sorting

data structures, sortings

Stripe 2

binary search, dp, sortings

Infinite Inversions

binary search, data structures, implementation, sortings, trees

DeadLee

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

Irrigation

binary search, data structures, implementation, sortings, trees, two pointers

Sofia and Strings

data structures, greedy, sortings, strings, two pointers

The way home

binary search, data structures, dp, graphs, greedy, shortest paths, sortings

Gosha is hunting

brute force, data structures, dp, flows, math, probabilities, sortings

Reducing Fractions

implementation, math, number theory, sortings

Ray Tracing

greedy, hashing, implementation, math, number theory, sortings

Autosynthesis

constructive algorithms, dfs and similar, graphs, greedy, sortings

Polygons

geometry, sortings

Olympiad

binary search, greedy, sortings, two pointers

Fedor and coupons

binary search, data structures, greedy, sortings

Subordinates

constructive algorithms, data structures, graphs, greedy, sortings

Divide Square

data structures, geometry, implementation, sortings

Well played!

greedy, sortings

Ball Sorting

data structures, dp, sortings

Cars

2-sat, constructive algorithms, dfs and similar, dsu, graphs, greedy, sortings

Two Types of Spells

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

Two Heaps

combinatorics, constructive algorithms, greedy, implementation, math, sortings

Skills

binary search, brute force, dp, greedy, sortings, two pointers

Resource Distribution

binary search, implementation, sortings

Cartons of milk

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

New Year Contest

greedy, sortings

Nezzar and Nice Beatmap

constructive algorithms, geometry, greedy, math, sortings

Weights Division (hard version)

binary search, dfs and similar, greedy, sortings, trees, two pointers

Multi-Colored Segments

binary search, data structures, math, sortings