Splitting the Uniqueness

constructive algorithms

Graph Reconstruction

constructive algorithms

Construct a tree

binary search, constructive algorithms, dfs and similar, graphs, greedy, trees

Sleep in Class

constructive algorithms, data structures, math, two pointers

PolandBall and White-Red graph

constructive algorithms, graphs, shortest paths

Complete Mirror

constructive algorithms, dfs and similar, dp, hashing, implementation, trees

Square Table

constructive algorithms, math, probabilities

Anti-Theft Road Planning

bitmasks, constructive algorithms, divide and conquer, greedy, interactive, math

Bubble Cup hypothesis

bitmasks, constructive algorithms, dp, math

Trails and Glades

constructive algorithms, dsu, graphs, greedy

Magical Permutation

bitmasks, brute force, constructive algorithms, data structures, graphs, math

Finals in arithmetic

constructive algorithms, implementation, math

Divisibility

constructive algorithms, dp, greedy, number theory

Minegraphed

constructive algorithms, graphs

Startup Funding

binary search, constructive algorithms, data structures, probabilities, two pointers

Renovation

constructive algorithms, greedy, sortings

Hamming Distance

constructive algorithms, greedy, math, matrices

New Year Presents

constructive algorithms, data structures

Chips Puzzle

constructive algorithms, implementation, math

Neatness

constructive algorithms, dfs and similar

Multithreading

constructive algorithms

Berland Local Positioning System

constructive algorithms, greedy, hashing, implementation

Berland SU Computer Network

constructive algorithms, dfs and similar, graphs, hashing, trees

Balanced Unshuffle (Medium)

brute force, constructive algorithms, trees

Balanced Unshuffle (Hard)

constructive algorithms, trees

Inversion SwapSort

constructive algorithms, greedy, sortings

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Hack it!

binary search, constructive algorithms, math

Jzzhu and Apples

constructive algorithms, number theory

Sign on Fence

binary search, constructive algorithms, data structures

Ski Accidents

constructive algorithms, graphs, greedy

Nastia Plays with a Tree

constructive algorithms, data structures, dfs and similar, dp, dsu, greedy, implementation, trees

Xor of 3

brute force, constructive algorithms, greedy, two pointers

Ehab's Last Theorem

constructive algorithms, dfs and similar, graphs, greedy

Towers

constructive algorithms, dfs and similar, dp, greedy, trees

Egor in the Republic of Dagestan

constructive algorithms, dfs and similar, dp, graphs, greedy, shortest paths

Mastermind

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

It's a bird! No, it's a plane! No, it's AaParsa!

constructive algorithms, graphs, shortest paths

Johnny and Megan's Necklace

binary search, bitmasks, constructive algorithms, dfs and similar, dsu, graphs

Joking (Easy Version)

binary search, constructive algorithms, interactive, ternary search

Oranges and Apples

constructive algorithms, sortings

Strange Shuffle

binary search, brute force, constructive algorithms, interactive

What Is It?

constructive algorithms, greedy

Yurii Can Do Everything

binary search, bitmasks, brute force, constructive algorithms, divide and conquer, two pointers

Anton and School

bitmasks, constructive algorithms, implementation, math

XOR Triangle

bitmasks, brute force, constructive algorithms, dp, greedy, math

Construct Matrix

constructive algorithms, math

Xum

bitmasks, constructive algorithms, math, matrices, number theory

Continuous City

bitmasks, constructive algorithms

Defender of Childhood Dreams

bitmasks, constructive algorithms, divide and conquer

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Swapping Problem

brute force, constructive algorithms, data structures, sortings

Almost Fault-Tolerant Database

brute force, constructive algorithms, dfs and similar, greedy, implementation

Picking Strings

constructive algorithms, implementation, strings

ANDfinity

bitmasks, brute force, constructive algorithms, dfs and similar, dsu, graphs

Add on a Tree: Revolution

constructive algorithms, dfs and similar, implementation, trees

Summoning Minions

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

Necklace

constructive algorithms, math

Game with Cards

binary search, constructive algorithms, data structures, dp, greedy, implementation

Doremy's Experimental Tree

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

In Search of Truth (Hard Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

Construct Tree

bitmasks, constructive algorithms, dp, trees

Coloring

combinatorics, constructive algorithms, implementation, math

Tree Factory

constructive algorithms, greedy, trees

Dasha and Chess

constructive algorithms, games, interactive

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Laboratory on Pluto

constructive algorithms, dp, greedy, math

Even Split

binary search, constructive algorithms, greedy, math

Degree Set

constructive algorithms, graphs, implementation

Inversion Composition

constructive algorithms, data structures, greedy

Inverse Transformation

constructive algorithms, implementation, math

Cook and Porridge

binary search, constructive algorithms, data structures, implementation

CNF 2

constructive algorithms, dfs and similar, graphs, greedy

AND-permutations

constructive algorithms

Madoka and The First Session

constructive algorithms, flows, graph matchings, graphs, implementation

Color the Carpet

constructive algorithms

Balance

constructive algorithms, dfs and similar, graphs, trees

Yaroslav and Algorithm

constructive algorithms

Palindromic Parentheses

constructive algorithms

One Node is Gone

constructive algorithms, implementation, trees

The Evil Temple and the Moving Rocks

constructive algorithms

SmartGarden

constructive algorithms, divide and conquer

Madness

constructive algorithms, dfs and similar, trees

Interactive Bulls and Cows (Hard)

brute force, constructive algorithms, interactive

Deputies

constructive algorithms, graphs, greedy, implementation

HQ

*special problem, constructive algorithms

Help Monks

constructive algorithms

Mike and Fish

constructive algorithms, dfs and similar, graphs

Arpa’s overnight party and Mehrdad’s silent entering

constructive algorithms, dfs and similar, graphs

Integer Game

constructive algorithms, games, interactive, math

Phoenix and Earthquake

constructive algorithms, dfs and similar, dsu, graphs, greedy, trees

Pairs of Pairs

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

Graph Subset Problem

constructive algorithms, data structures, graphs

Parametric MST

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

Flip the Cards

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

Not Same

constructive algorithms

Twin Clusters

bitmasks, brute force, constructive algorithms, math, probabilities

Colouring Game

constructive algorithms, dp, games

Bring Balance

brute force, constructive algorithms, greedy