Dima and Trap Graph

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

Matrix

combinatorics, data structures, implementation

Two Circles

brute force, data structures, implementation

Fools and Foolproof Roads

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

Insertion Sort

data structures, dp, implementation, math

Pair of Numbers

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

Knight Tournament

data structures, dsu

Jeff and Removing Periods

data structures

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Color the Fence

data structures, dp, greedy, implementation

Subset Sums

brute force, data structures

Water Tree

data structures, dfs and similar, graphs, trees

Alternating Current

data structures, greedy, implementation

Xenia and Tree

data structures, divide and conquer, trees

Iahub and Xors

data structures

Bubble Sort Graph

binary search, data structures, dp

Xenia and Bit Operations

data structures, trees

Optimize!

data structures

Students' Revenge

data structures, greedy, sortings

Maximum Absurdity

data structures, dp, implementation

Escaping on Beaveractor

data structures, implementation, trees

Shave Beaver!

data structures

Oh Sweet Beaverette

data structures, sortings

Two permutations

data structures

Ciel and Gondolas

data structures, divide and conquer, dp

Ping-Pong

data structures

Psychos in a Line

data structures, implementation

Summer Homework

data structures, math

Summer Homework

data structures, math

Summer Homework

brute force, data structures

Sereja and Straight Lines

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

Sereja and Subsequences

data structures, dp

Ilya and Two Numbers

constructive algorithms, data structures, dsu, greedy

Interval Cubing

data structures, math

Fetch the Treasure

brute force, data structures, graphs, shortest paths

Cats Transport

data structures, dp

Optimizer

data structures, greedy, sortings

Yaroslav and Divisors

data structures

Mystic Carvings

data structures

Yaroslav and Points

data structures

Greg and Array

data structures, implementation

Close Vertices

data structures, divide and conquer, trees

Copying Data

data structures

Connected Components

data structures, dfs and similar, dp, dsu

Tourists

data structures, sortings

Cow Tennis Tournament

combinatorics, data structures, math

Cows and Sequence

constructive algorithms, data structures, implementation

Sausage Maximization

bitmasks, data structures, trees

Sequence Transformation

brute force, data structures, dp, implementation, math

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Maximum Xor Secondary

data structures, implementation, two pointers

Little Girl and Problem on Trees

data structures, graphs, trees

Little Girl and Maximum Sum

data structures, greedy, implementation, sortings

Mirror Room

data structures, implementation

Dima and Staircase

data structures, implementation

Good Substrings

data structures, strings

Multithreading

data structures, greedy, implementation

Maximum Waterfall

data structures, dp, graphs, sortings

More Queries to Array...

data structures, math

Roadside Trees

data structures, dp

Escape from Stones

constructive algorithms, data structures, implementation, two pointers

Rhombus

brute force, data structures, dp

Dividing Kingdom

binary search, brute force, data structures

Little Elephant and Tree

data structures, dfs and similar, trees

Greedy Elevator

data structures, implementation

Lucky Arrays

data structures

Printer

binary search, data structures, implementation, sortings

Text Editor

data structures, dfs and similar, graphs, greedy, shortest paths

Donkey and Stars

data structures, dp, geometry, math, sortings

Blood Cousins Return

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

Matrix

data structures

Cubes

data structures, dp, geometry, two pointers

XOR on Segment

bitmasks, data structures

Friends

binary search, bitmasks, data structures, math

TorCoder

data structures

Tape Programming

data structures, implementation

Cyclical Quest

data structures, string suffix structures, strings

Fence

binary search, data structures, string suffix structures

Cactus

data structures, dfs and similar, dp, graphs, trees

Planets

binary search, data structures, graphs, shortest paths

Zigzag

data structures

Noble Knight's Path

data structures, trees

Anniversary

data structures, implementation, math, matrices, number theory

Two Strings

data structures, dp, strings

Bracket Sequence

data structures, expression parsing, implementation

Cosmic Tables

data structures, implementation

Little Elephant and Inversions

data structures, two pointers

Little Elephant and Shifts

data structures

Little Elephant and Array

constructive algorithms, data structures

Parking Lot

data structures

Alien DNA

data structures, dsu, trees

Two Permutations

data structures, hashing, strings

Cutting a Fence

binary search, data structures, dsu

Blood Cousins

binary search, data structures, dfs and similar, trees

Game with Two Trees

data structures

Little Elephant and Strings

data structures, implementation, string suffix structures, two pointers

Little Elephant and Cards

binary search, data structures

Cinema

brute force, data structures

Gripping Story

binary search, data structures, sortings

The Next Good String

data structures, greedy, hashing, strings