Wilbur and Trees

dp, math, probabilities, sortings

Minimal String Xoration

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

Off by One

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

Paint Tree

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

Strange Array

data structures, greedy, sortings

Mice and Holes

data structures, dp, greedy, sortings

Parametric MST

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

Guard Towers

binary search, dsu, geometry, graphs, sortings

Bear and Contribution

data structures, greedy, sortings, two pointers

Gojou and Matrix Game

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

Beautiful Road

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

General Mobilization

data structures, dfs and similar, sortings

Curfew

binary search, brute force, greedy, sortings

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Choose a Square

binary search, data structures, sortings

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Points Movement

data structures, dp, greedy, implementation, sortings

Morse Code

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

Reading Books (hard version)

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

Berland Elections

greedy, sortings

Bicolored Segments

data structures, dp, graph matchings, sortings

Group Photo 2 (online mirror version)

brute force, greedy, sortings

Mushroom Gnomes - 2

binary search, data structures, probabilities, sortings

Flip the Cards

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

Array Equalizer

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

Summer Earnings

binary search, bitmasks, brute force, geometry, sortings

Runner's Problem

dp, matrices, sortings

New Year and Three Musketeers

data structures, greedy, sortings

Difficult Mountain

data structures, dp, greedy, sortings

Minimum Sum

divide and conquer, geometry, sortings

Students' Revenge

data structures, greedy, sortings

Summoning Minions

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

Sanae and Giant Robot

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

Hostname Aliases

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

Lovely Matrix

dfs and similar, graphs, greedy, sortings

Playlist

math, probabilities, sortings

New Year and Castle Construction

combinatorics, geometry, math, sortings

New Year and the Acquaintance Estimation

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

PermutationForces II

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

Analyzing Polyline

geometry, math, sortings

Zebra Tower

*special problem, data structures, greedy, sortings

Fancy Fence

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

Ice Cream Shop

brute force, implementation, sortings

Trader Problem

data structures, dsu, greedy, sortings

Knights

geometry, graphs, shortest paths, sortings

Banquet Preparations 2

greedy, sortings, two pointers

New Passenger Trams

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

Median on Segments (General Case Edition)

sortings

Oranges and Apples

constructive algorithms, sortings

Gift

dsu, graphs, sortings, trees

Before Exam

constructive algorithms, implementation, sortings

Expected diameter of a tree

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

Leaf Sets

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

80-th Level Archeology

brute force, data structures, greedy, sortings

Guess Your Way Out! II

data structures, implementation, sortings

Rooks and Rectangles

data structures, sortings

Bus

*special problem, implementation, sortings

Bamboo Partition

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

Hydra

graphs, sortings

Geometry Horse

greedy, implementation, sortings, two pointers

Mice problem

geometry, implementation, math, sortings

Purple Crayon

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

Cyclic Shifts Sorting

brute force, constructive algorithms, implementation, sortings

Counter Attack

data structures, dsu, graphs, hashing, sortings

Mahmoud and Ehab and the function

binary search, data structures, sortings

Spanning Tree Queries

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

Spider's Web

binary search, sortings, two pointers

Red-Blue Matrix

brute force, constructive algorithms, implementation, sortings

Number of Groups

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

Flying Sort (Hard Version)

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

Network Safety

dfs and similar, dsu, graphs, math, sortings

Scalar Queries

combinatorics, data structures, math, sortings

Plan of Lectures

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

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

Trading Business

greedy, sortings

Culture Code

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

Oh Sweet Beaverette

data structures, sortings

Mastermind

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

Event Dates

greedy, meet-in-the-middle, sortings

Two Editorials

brute force, dp, greedy, sortings, two pointers

Yet Another Segments Subset

data structures, dp, graphs, sortings

Travel Cards

greedy, implementation, sortings

A Heap of Heaps

brute force, data structures, math, sortings

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Phone Talks

*special problem, dp, sortings

Gosha is hunting

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

Destroy it!

dp, implementation, sortings

Mittens

constructive algorithms, greedy, sortings

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Delete a Segment

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

Leaving the Bar

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

Physical Education

sortings

Permutation recovery

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

Distributing Parts

greedy, sortings

Average Score

greedy, math, sortings

New School

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

Optimal Insertion

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

Count The Rectangles

bitmasks, brute force, data structures, geometry, sortings

Doctor

binary search, math, sortings