Easy Problem

dp

Vasya and Array

dp

Tree with Maximum Cost

dfs and similar, dp, trees

New Year and the Permutation Concatenation

combinatorics, dp, math

Alice the Fan

dp

Ehab and a component choosing problem

dp, greedy, math, trees

Beautiful Matrix

combinatorics, data structures, dp

The Fair Nut and String

combinatorics, dp, implementation

The Fair Nut and Rectangles

data structures, dp, geometry

The Fair Nut and the Best Path

data structures, dp, trees

Speed Dial

dp, strings, trees

Increasing Frequency

binary search, dp, greedy

Colorful Bricks

combinatorics, dp, math

Pictures with Kittens (hard version)

data structures, dp

Pictures with Kittens (easy version)

dp

Summer Practice Report

dp, greedy

Choosing Two Paths

dfs and similar, dp, greedy, trees

Segment Sum

bitmasks, combinatorics, dp, math

Streets and Avenues in Berhattan

dp

Monsters and Potions

brute force, dp, greedy, implementation

Find a Number

dp, graphs, number theory, shortest paths

Random Forest Rank

dp, graph matchings, math, trees

Computer Game

dp, greedy, math, probabilities

Array Without Local Maximums

dp

Yet another 2D Walking

dp

Up and Down the Tree

dfs and similar, dp, trees

Three Pieces

dfs and similar, dp, shortest paths

String Journey

data structures, dp, string suffix structures

Multiplicity

data structures, dp, implementation, math, number theory

Shrinking Tree

combinatorics, dp

Sergey and Subway

dfs and similar, dp, trees

Split the Tree

binary search, data structures, dp, greedy, trees

Tanya and Colored Candies

*special problem, dp

Write The Contest

binary search, dp, math

Decorate Apple Tree

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

Segments on the Line

binary search, dp

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Bicolorings

bitmasks, dp

Vasya and Multisets

brute force, dp, greedy, implementation, math

Optimal Polygon Perimeter

dp, geometry

Make It One

bitmasks, combinatorics, dp, math, number theory, shortest paths

Vasya and Magic Matrix

dp, math, probabilities

Vitamins

bitmasks, brute force, dp, implementation

Ray in the tube

data structures, divide and conquer, dp, math

Shashlik Cooking

dp, greedy, math

You Are Given a Tree

data structures, dp, trees

Wrap Around

dp, strings

Maximum Matching

bitmasks, brute force, dfs and similar, dp, graphs

Slime

dp, greedy, implementation

Equalize

dp, greedy, strings

Classy Numbers

combinatorics, dp

Little C Loves 3 III

bitmasks, dp, math

Region Separation

combinatorics, dp, number theory, trees

Permutation Game

brute force, dp, games

Vasya and Maximum Matching

dp, trees

The Unbearable Lightness of Weights

dp, math

Playing Piano

constructive algorithms, dp

Vasya and Good Sequences

bitmasks, dp

Tree with Small Distances

dp, graphs, greedy

Creating the Contest

dp, greedy, math

Guess the number

dp, interactive

Inverse Coloring

combinatorics, dp, math

Recovering BST

brute force, dp, math, number theory, trees

Road Projects

dfs and similar, dp, trees

Vasya And The Mushrooms

dp, implementation

Bracket Substring

dp, strings

Stars Drawing (Hard Edition)

binary search, dp, greedy

Stars Drawing (Easy Edition)

brute force, dp, greedy

Passports

dp, implementation

Hills

dp

Mini Metro

dp

Xor-Paths

bitmasks, brute force, dp, meet-in-the-middle

Polycarp and Div 3

dp, greedy, number theory

Sonya and Ice Cream

binary search, data structures, dp, greedy, shortest paths, trees

Abbreviation

dp, hashing, strings

Two-Paths

data structures, dp, trees

Yet Another Problem On a Subsequence

combinatorics, dp

Cards and Joy

dp

Cutting

dp, greedy, sortings

Roman Digits

brute force, combinatorics, dp, greedy, math

Hit the Lottery

dp, greedy

Cowmpany Cowmpensation

combinatorics, dp, math, trees

Compute Power

binary search, dp, greedy

Bishwock

dp, greedy

GCD Counting

divide and conquer, dp, dsu, number theory, trees

Flow Control

dfs and similar, dp, greedy, trees

A Trance of Nightfall

dp, geometry, matrices, probabilities

Rain and Umbrellas

dp

Three displays

brute force, dp, implementation

Pencils and Boxes

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

Elevator

dp, graphs, shortest paths

XOR-pyramid

dp

Cut 'em all!

dfs and similar, dp, graphs, greedy, trees

K Paths

combinatorics, data structures, dp, fft, math

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Bookshelves

bitmasks, dp, greedy

Cactus to Tree

dp, graphs, trees

Perfect Groups

dp, math, number theory

Kuro and Topological Parity

dp

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees