Pillars

binary search, data structures, dp, sortings, trees

Count Paths

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

Graph Coloring

dfs and similar, dp, graphs

New Year and Fireworks

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

Decreasing Heights

brute force, dp

Sleepy Game

dfs and similar, dp, games, graphs

Number of Components

combinatorics, data structures, dp, math

Almost Triple Deletions

data structures, dp, greedy

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Game on Sum (Easy Version)

combinatorics, dp, games, math

Flag

brute force, combinatorics, dp, implementation

Flying Sort (Easy Version)

dp, greedy, two pointers

Sergey and Subway

dfs and similar, dp, trees

Vasya and Good Sequences

bitmasks, dp

Centroids

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

Vasya and Beautiful Arrays

brute force, dp, number theory

Bank Hacking

constructive algorithms, data structures, dp, trees

Rectangle Painting 1

dp

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Clear Symmetry

constructive algorithms, dp, math

Doremy's Drying Plan (Easy Version)

brute force, data structures, dp, greedy, sortings

My pretty girl Noora

brute force, dp, greedy, math, number theory

Ciel and Duel

dp, flows, greedy

Winter Is Coming

dp, greedy, sortings

Blood Cousins Return

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

New Year's Puzzle

brute force, dp, graph matchings, greedy, sortings

Skyline Photo

data structures, divide and conquer, dp

Marbles

bitmasks, dp

Credit Card

data structures, dp, greedy, implementation

Subsequences (hard version)

dp, strings

Antimatter

dp

Elimination

dp, implementation, math

Roman Digits

brute force, combinatorics, dp, greedy, math

Vlad and Trouble at MIT

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

Pictures with Kittens (hard version)

data structures, dp

Increase Sequence

combinatorics, dp

Moving Both Hands

dp, graphs, shortest paths

Completely Searching for Inversions

dfs and similar, dp, graphs

Paint the Middle

dp, greedy, sortings, two pointers

Mahmoud and a xor trip

bitmasks, constructive algorithms, data structures, dfs and similar, dp, math, trees

Bear and Tree Jumps

dfs and similar, dp, trees

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Telepanting

binary search, data structures, dp, sortings

Array Without Local Maximums

dp

How Many Paths?

dfs and similar, dp, graphs, trees

Counting Rhyme

dp, math, number theory

Tree with Small Distances

dp, graphs, greedy

Balanced String

dp

Portals

data structures, dp, greedy, implementation, sortings

Jon and Orbs

dp, math, probabilities

Famil Door and Brackets

dp, strings

Keyboard Purchase

bitmasks, dp

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

Wet Shark and Blocks

dp, matrices

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Queue

constructive algorithms, dp

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Packmen

binary search, dp

Vowels

combinatorics, divide and conquer, dp

Robot Rapping Results Report

binary search, dp, graphs

Levko and Array

binary search, dp

Sum of Digits

brute force, constructive algorithms, dp, greedy

Destruction of a Tree

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

Games with Rectangle

combinatorics, dp

Ability To Convert

constructive algorithms, dp, greedy, math, strings

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Jeff and Rounding

dp, greedy, implementation, math

Winter is here

combinatorics, dp, math, number theory

Team Work

combinatorics, dp, math

Group Projects

dp

Trees and Segments

brute force, data structures, dp, greedy, two pointers

Choosing Balls

dp

Array Collapse

data structures, divide and conquer, dp, trees

Pathwalks

data structures, dp, graphs

Jerry's Protest

brute force, combinatorics, dp, probabilities

Inna and Dima

dfs and similar, dp, graphs, implementation

Preorder

combinatorics, divide and conquer, dp, dsu, hashing, sortings, trees

Kingdom and its Cities

dfs and similar, divide and conquer, dp, graphs, sortings, trees

Graph Cost

dp, greedy, math, number theory

Anton and School - 2

combinatorics, dp, math, number theory

Relay Race

dp

Game of Stones

bitmasks, dp, games

Doremy's Pegging Game

combinatorics, dp, math

Gold Transfer

binary search, data structures, dp, greedy, interactive, trees

Lynyrd Skynyrd

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

Antenna Coverage

data structures, dp, greedy, sortings

Substring and Subsequence

dp

Four Segments

brute force, data structures, dp

Trains and Statistic

data structures, dp, greedy

Speedrun

brute force, dfs and similar, dp, graphs, greedy, math, sortings, two pointers

Breaking Good

dfs and similar, dp, graphs, shortest paths

Complete the Projects (hard version)

dp, greedy

Hossam and (sub-)palindromic tree

brute force, data structures, dfs and similar, dp, strings, trees

Spy Syndrome 2

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

Not Quite Lee

combinatorics, dp, math, number theory

Obsessive String

dp, strings

Fibonacci-ish

brute force, dp, hashing, implementation, math

Makoto and a Blackboard

dp, math, number theory, probabilities

Playlist for Polycarp (easy version)

bitmasks, combinatorics, dp

Tourism

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