Counting Rectangles is Fun

brute force, divide and conquer, dp

Counting Kangaroos is Fun

binary search, greedy, sortings, two pointers

Subway Innovation

greedy, math, two pointers

Vessels

data structures, dsu, implementation, trees

Hamburgers

binary search, brute force

Fox Dividing Cheese

math, number theory

K-Periodic Array

greedy, implementation, math

Summer Reading

dp, greedy

Broken Monitor

brute force, constructive algorithms, greedy, implementation

Mittens

constructive algorithms, greedy, sortings

Berland Bingo

implementation

Rook, Bishop and King

graphs, math, shortest paths

Valera and Queries

binary search, data structures

Valera and Fools

dfs and similar, dp, graphs, shortest paths

Valera and Elections

dfs and similar, graphs, trees

Valera and Contest

constructive algorithms, implementation, math

Valera and Plates

greedy, implementation

Sereja and Suffixes

data structures, dp

Sereja and Coat Rack

implementation

Sereja and Intervals

combinatorics, dp

Sereja and Sets

bitmasks, dfs and similar

Sereja and the Arrangement of Numbers

graphs, greedy, sortings

Sereja ans Anagrams

binary search, data structures

Sereja and Algorithm

data structures, implementation

Dima and Magic Guitar

brute force, implementation, math

Dima and Trap Graph

binary search, data structures, dfs and similar, dsu, shortest paths, two pointers

Dima and Salad

dp

Dima and To-do List

brute force, implementation

Dima and Guards

implementation

The Fibonacci Segment

implementation

Good Number

implementation

Empty Rectangles

divide and conquer, two pointers

Ghd

brute force, math, probabilities

Beautiful Set

brute force, number theory

Free Market

dp, greedy

Matrix

combinatorics, data structures, implementation

Two Circles

brute force, data structures, implementation

Renting Bikes

binary search, greedy

Fixing Typos

greedy, implementation

Fence

brute force, dp

Soroban

implementation

Petya and Pipes

flows, graphs, shortest paths

Fools and Foolproof Roads

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

Insertion Sort

data structures, dp, implementation, math

Petya and Staircases

implementation, sortings

Two Semiknights Meet

greedy, math

Levko and Permutation

constructive algorithms, math, number theory

Levko and Table

constructive algorithms, implementation

Levko and Game

graphs, greedy, shortest paths

Levko and Sets

number theory

Levko and Strings

combinatorics, dp

Levko and Array

binary search, dp

Levko and Array Recovery

greedy, implementation

Neatness

constructive algorithms, dfs and similar

Pair of Numbers

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

Prime Number

math, number theory

Permutation

constructive algorithms, dp, math

Table

constructive algorithms, greedy, implementation

Dima and Kicks

brute force, dsu, graphs, implementation

Dima and Hares

dp, greedy

Dima and Containers

constructive algorithms, greedy, implementation

Dima and Text Messages

brute force, strings

Dima and Continuous Line

brute force, implementation

Flag Day

constructive algorithms, implementation

Group of Students

brute force, greedy, implementation

Xenia and String Problem

dp, hashing, implementation, string suffix structures, strings

Bags and Coins

bitmasks, constructive algorithms, dp, greedy

Compartments

combinatorics, constructive algorithms, greedy, implementation

Xenia and Hamming

implementation, math

Knight Tournament

data structures, dsu

Vasya and Public Transport

greedy, implementation

Vasya and Digital Root

constructive algorithms, implementation

Lucky Number Representation

constructive algorithms, dfs and similar, dp

Transferring Pyramid

dp

Vasya and Beautiful Arrays

brute force, dp, number theory

Game with Strings

bitmasks, dp, games

Vasya and Robot

brute force, greedy, math

Antichain

dp, graph matchings, greedy

Queue

constructive algorithms, dp

Find Maximum

implementation, math, number theory

Two Heaps

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

Domino

implementation, math

Jeff and Periods

implementation, sortings

Jeff and Digits

brute force, implementation, math

Jeff and Permutation

greedy

Jeff and Removing Periods

data structures

Jeff and Brackets

dp, matrices

Jeff and Furik

combinatorics, dp, probabilities

Jeff and Rounding

dp, greedy, implementation, math

Wrong Floyd

brute force, constructive algorithms, dfs and similar, graphs

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Bombs

greedy, implementation, sortings

Resort

graphs

TL

brute force, greedy, implementation

Color the Fence

data structures, dp, greedy, implementation

Cinema Line

greedy, implementation

Pilgrims

dfs and similar, dp, trees

Turtles

dp, matrices

Subset Sums

brute force, data structures

Apple Tree

dfs and similar, number theory, trees