Good Contest

combinatorics, dp, probabilities

Obtain The String

dp, greedy, strings

Three Paths on a Tree

dfs and similar, dp, greedy, trees

Nora's Toy Boxes

bitmasks, combinatorics, dp

Chaotic V.

dp, graphs, greedy, math, number theory, trees

Xenon's Attack on the Gangs

combinatorics, dfs and similar, dp, greedy, trees

Making Shapes

dp

Minimax Problem

binary search, bitmasks, dp

Two Arrays

combinatorics, dp

Harry The Potter

brute force, constructive algorithms, dp, fft, implementation, math

Garland

dp, greedy, sortings

Delete a Segment

brute force, constructive algorithms, data structures, dp, graphs, sortings, trees, two pointers

Dr. Evil Underscores

bitmasks, brute force, dfs and similar, divide and conquer, dp, greedy, strings, trees

Just Eat It!

dp, greedy, implementation

New Year and Ascent Sequence

binary search, combinatorics, data structures, dp, implementation, sortings

New Year Parties

dp, greedy

K for the Price of One (Hard Version)

dp, greedy, sortings

K for the Price of One (Easy Version)

dp, greedy, sortings

Miss Punyverse

dp, greedy, trees

New Year and Handle Change

binary search, dp

New Year Permutations

combinatorics, dp

Cards

combinatorics, dp, math, number theory, probabilities

Berry Jam

data structures, dp, greedy, implementation

Tree Elimination

dp, trees

As Simple as One and Two

dp, greedy

Two Bracket Sequences

dp, strings, two pointers

Remove One Element

brute force, dp

Yet Another Broken Keyboard

combinatorics, dp, implementation

Common Number

binary search, combinatorics, dp, math

Portals

data structures, dp, greedy, implementation, sortings

Happy Cactus

dp

Domino for Young

dp, greedy, math

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Beautiful Mirrors

data structures, dp, math, probabilities

Beautiful Bracket Sequence (easy version)

combinatorics, dp, probabilities

Economic Difficulties

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

Tournament

brute force, dp, greedy

A Game with Traps

binary search, dp, greedy, sortings

The Contest

data structures, dp, greedy

Yet Another Monster Killing Problem

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

Yet Another Division Into Teams

dp, greedy, sortings

Antenna Coverage

data structures, dp, greedy, sortings

Sweets Eating

dp, greedy, math, sortings

Tiling Terrace

brute force, dp

Find String in a Grid

data structures, dp, strings, trees

Cleaning Robots

dp, trees

Voting (Easy Version)

data structures, dp, greedy

Discarding Game

dp, greedy, two pointers

Conference Problem

dp

Maximum Weight Subset

dp, trees

By Elevator or Stairs?

dp, shortest paths

The World Is Just a Programming Task (Easy Version)

brute force, dp, greedy, implementation

Daniel and Spring Cleaning

bitmasks, brute force, combinatorics, dp

Hyakugoku and Ladders

dp, probabilities, shortest paths

Constanze's Machine

dp

Restricted RPS

constructive algorithms, dp, greedy

Paint the Tree

brute force, constructive algorithms, dp, graphs, implementation, trees

Sum Balance

bitmasks, dfs and similar, dp, graphs

Turtle

dp, implementation

Ivan the Fool and the Probability Theory

combinatorics, dp, math

The Maximum Subtree

dfs and similar, dp, graphs, trees

Keyboard Purchase

bitmasks, dp

AB-string

binary search, combinatorics, dp, strings

Standard Free2play

dp, greedy, math

Balanced Distribution

data structures, dp, greedy

Balanced Domino Placements

combinatorics, dp

Balanced Binary Search Trees

dp, math

Alice and the Unfair Game

binary search, data structures, dp, dsu

Yet Another Substring Reverse

bitmasks, dp

Pipes

dp, implementation

Another Filling the Grid

combinatorics, dp, math

Wrong Answer on test 233 (Easy Version)

dp

To Make 1

bitmasks, constructive algorithms, dp, greedy, number theory

Rock Is Push

binary search, dp

Stack Exterminable Arrays

data structures, divide and conquer, dp, hashing

Paint the Tree

dp, sortings, trees

Sequence Sorting

dp, greedy, two pointers

Graph And Numbers

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

Make The Fence Great Again

dp

Tourism

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

Jumping Transformers

dp

BubbleReactor

dp, graphs

Wi-Fi

data structures, dp, greedy

Marbles

bitmasks, dp

The Number of Products

combinatorics, dp, implementation

Treasure Island

dfs and similar, dp, flows, hashing

Road Repair in Treeland

*special problem, binary search, dp, trees

Mateusz and Escape Room

dp

Rotate Columns (hard version)

bitmasks, dp, greedy, sortings

Rotate Columns (easy version)

bitmasks, brute force, dp, greedy, sortings

Bits And Pieces

bitmasks, dfs and similar, dp, greedy

Gas Pipeline

dp, greedy

Make Product Equal One

dp, implementation

Natasha, Sasha and the Prefix Sums

combinatorics, dp, math, number theory

Anna, Svyatoslav and Maps

dp, graphs, greedy, shortest paths

Complete the Projects (hard version)

dp, greedy

You Are Given a WASD-string...

brute force, data structures, dp, greedy, implementation, math, strings

You Are Given a Decimal String...

brute force, dp, shortest paths

Treasure Hunting

binary search, dp, greedy, implementation

Graph Traveler

brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory