Cyclic MEX

data structures, implementation, math, two pointers

Prime Permutation

implementation, number theory, strings

To Go Or Not To Go?

brute force, dfs and similar, graphs, greedy, implementation, shortest paths

Game on Tree

implementation, math, probabilities, trees

Problems for Round

greedy, implementation

Multitasking

greedy, implementation, sortings, two pointers

Sum of Progression

brute force, data structures, dp, implementation, math

Cracking the Code

implementation, math

Inna and Alarm Clock

implementation

The Butcher

geometry, greedy, implementation, sortings, two pointers

High Load

constructive algorithms, greedy, implementation, trees

Three Logos

bitmasks, brute force, constructive algorithms, geometry, implementation, math

Two Tables

brute force, implementation

The Monster

dp, greedy, implementation, math

Reberland Linguistics

dp, implementation, strings

Chess

brute force, implementation, math

Decreasing Debts

constructive algorithms, data structures, graphs, greedy, implementation, math, two pointers

Multicolored Cars

data structures, implementation

Johnny and Grandmaster

greedy, implementation, math, sortings

Find Pair

implementation, math, sortings

Unshuffling a Deck

constructive algorithms, implementation

Amity Assessment

brute force, constructive algorithms, implementation

Mike's Sequence

*special problem, divide and conquer, implementation, math

Flea travel

implementation, math

Quiz League

implementation

Non-Palindromic Substring

hashing, implementation, math, strings

Make It Increasing

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

Maximum Control (easy)

implementation

Mahmoud and Ehab and the xor-MST

bitmasks, dp, graphs, implementation, math

Predict Outcome of the Game

brute force, implementation, math

Union of Doubly Linked Lists

implementation

Laboratory Work

implementation, math

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation

Game of the Rows

brute force, greedy, implementation

Nene and the Mex Operator

bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math

Regular Bridge

constructive algorithms, graphs, implementation

Mishap in Club

greedy, implementation

Facetook Priority Wall

expression parsing, implementation, strings

Holidays

implementation

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Vladik and Memorable Trip

dp, implementation

Recover the String

constructive algorithms, greedy, implementation, math

Bets

greedy, implementation

Best Pair

binary search, brute force, implementation

Suitable Replacement

binary search, greedy, implementation

Circular Spanning Tree

constructive algorithms, implementation, trees

Linguistics

greedy, implementation, sortings, strings

Yet Another Array Queries Problem

data structures, implementation

Decryption

constructive algorithms, implementation, math, number theory

Vanya and Computer Game

binary search, implementation, math, sortings

About Bacteria

implementation, math

Four Segments

brute force, constructive algorithms, geometry, implementation, math

Island Puzzle

constructive algorithms, implementation

Toy Sum

greedy, implementation, math

Grid Xor

constructive algorithms, greedy, implementation, interactive, math

Build a Tree and That Is It

constructive algorithms, implementation, trees

New Year and Fireworks

brute force, data structures, dfs and similar, dp, implementation

No Palindromes

brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings

Om Nom and Spiders

implementation, math

The Human Equation

greedy, implementation

Command Line Arguments

*special problem, implementation, strings

Expand the Path

brute force, combinatorics, data structures, implementation, math

Flag

brute force, combinatorics, dp, implementation

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Permutation Game

implementation

Let's Play the Words?

data structures, hashing, implementation, math

Mysterious strings

*special problem, implementation

Vlad and the Mountains

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

Nearest Fraction

brute force, implementation, two pointers

Credit Card

data structures, dp, greedy, implementation

Balls and Boxes

constructive algorithms, greedy, implementation

Calendar

brute force, implementation

Delete Them

constructive algorithms, implementation

Kuroni and the Score Distribution

constructive algorithms, greedy, implementation, math

Secret

constructive algorithms, implementation

Extra-terrestrial Intelligence

implementation

Help Chef Gerasim

implementation, sortings

Marathon

implementation, math

Rudolph and Mimic

constructive algorithms, implementation, interactive

Fibonacci Strings

greedy, implementation, math, number theory

Elimination

dp, implementation, math

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Inna and Huge Candy Matrix

implementation, math

Tyler and Strings

combinatorics, data structures, implementation

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Buses Between Cities

implementation

Ravioli Sort

implementation

Great Vova Wall (Version 2)

data structures, implementation

Little Artem and Dance

brute force, constructive algorithms, implementation

Inna and Pink Pony

greedy, implementation

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

Innokenty and a Football League

2-sat, graphs, greedy, implementation, shortest paths, strings

Traffic Lights

implementation

Solution for Cube

brute force, implementation

Up the hill

constructive algorithms, implementation

Orchestra

brute force, implementation

Square Earth?

dfs and similar, greedy, implementation

Spelling Check

hashing, implementation, strings

Funny Substrings

data structures, hashing, implementation, matrices, strings