Substring

dfs and similar, dp, graphs

MADMAX

dfs and similar, dp, games, graphs

The Monster

dp, greedy, implementation, math

Permute Digits

dp, greedy

Travelling Salesman and Special Numbers

brute force, combinatorics, dp

Party Lemonade

bitmasks, dp, greedy

Coprocessor

dfs and similar, dp, graphs, greedy

Python Indentation

dp

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Square Subsets

bitmasks, combinatorics, dp, math

Counting Arrays

combinatorics, dp, math, number theory

Credit Card

data structures, dp, greedy, implementation

Almost Identity Permutations

combinatorics, dp, math

Photo Processing

binary search, dp

The Intriguing Obsession

combinatorics, dp, math

Fire

dp, sortings

Helga Hufflepuff's Cup

dp, trees

Neural Network country

dp, matrices

Packmen

binary search, dp

Four Segments

brute force, data structures, dp

Driving Test

data structures, dp, greedy

Palindromic characteristics

brute force, dp, hashing, strings

Star sky

dp, implementation

Office Keys

binary search, brute force, dp, greedy, sortings

My pretty girl Noora

brute force, dp, greedy, math, number theory

Really Big Numbers

binary search, brute force, dp, math

An overnight dance in discotheque

dfs and similar, dp, geometry, greedy, trees

An impassioned circulation of affection

brute force, dp, strings, two pointers

Sagheer, the Hausmeister

bitmasks, brute force, dp

Vladik and Memorable Trip

dp, implementation

Roma and Poker

dp, graphs

Mike and gcd problem

dp, greedy, number theory

Array Queries

brute force, data structures, dp

Bank Hacking

constructive algorithms, data structures, dp, trees

Divide by Three

dp, greedy, math, number theory

Functions again

dp, two pointers

Berzerk

dfs and similar, dp, games

Hanoi Factory

brute force, data structures, dp, greedy, sortings

Alyona and Spreadsheet

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

Stepan's Series

*special problem, dp

Jon Snow and his Favourite Number

brute force, dp, implementation, sortings

Mahmoud and a Dictionary

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

Mahmoud and a Message

brute force, dp, greedy, strings

Timofey and a tree

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

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Travel Card

binary search, dp

New Year and Fireworks

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

Winter Is Coming

dp, greedy, sortings

Chloe and pleasant prizes

dfs and similar, dp, graphs, trees

Arpa's weak amphitheater and Mehrdad's valuable Hoses

dfs and similar, dp, dsu

Anton and Making Potions

binary search, dp, greedy, two pointers

Epidemic in Monstropolis

constructive algorithms, dp, greedy, two pointers

Bottles

dp

Olympiad in Programming and Sports

dp, flows, graphs, greedy

Journey

dp, graphs

Efim and Strange Grade

dp, implementation, math

Coloring Trees

dp

Generate a String

dfs and similar, dp

Hard problem

dp, strings

Connecting Universities

dfs and similar, dp, graphs, trees

PLEASE

combinatorics, dp, implementation, math, matrices

Mike and Geometry Problem

combinatorics, data structures, dp, geometry, implementation

The Values You Can Make

dp

Kay and Snowflake

data structures, dfs and similar, dp, trees

Robbers' watch

brute force, combinatorics, dp, math

Alyona and Strings

dp, strings

Alyona and the Tree

dfs and similar, dp, graphs, trees

Recycling Bottles

dp, geometry, greedy, implementation

Reberland Linguistics

dp, implementation, strings

Hard Process

binary search, dp, two pointers

Image Preview

binary search, brute force, dp, two pointers

Robot Rapping Results Report

binary search, dp, graphs

Running with Obstacles

*special problem, data structures, dp, greedy

Fibonacci-ish

brute force, dp, hashing, implementation, math

Spy Syndrome 2

data structures, dp, hashing, implementation, sortings, string suffix structures, strings

Babaei and Birthday Cake

data structures, dp

Famil Door and Brackets

dp, strings

XOR Equation

dp, math

Jerry's Protest

brute force, combinatorics, dp, probabilities

Wet Shark and Blocks

dp, matrices

Running Track

dp, greedy, strings, trees

Longtail Hedgehog

dp, graphs

Skills

binary search, brute force, dp, greedy, sortings, two pointers

New Year and Ancient Prophecy

dp, hashing, strings

Zuma

dp

Chain Reaction

binary search, dp

Alternative Thinking

dp, greedy, math

Chocolate Bar

brute force, dp

Subsequences

data structures, dp

Restaurant

dp, greedy, sortings

Once Again...

constructive algorithms, dp, matrices

Kefa and Dishes

bitmasks, dp

Modulo Sum

combinatorics, data structures, dp, two pointers

Bots

combinatorics, dp, math, number theory

Bear and Blocks

binary search, data structures, dp, math

Minimization

dp, greedy, sortings

Symmetric and Transitive

combinatorics, dp, math

Geometric Progression

binary search, data structures, dp

Arthur and Table

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

Vanya and Scales

brute force, dp, greedy, math, meet-in-the-middle, number theory