Letters and Question Marks

bitmasks, dp, string suffix structures

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Count The Blocks

combinatorics, dp, math

Spiderweb Trees

dp, geometry, trees

Wise Men (Hard Version)

bitmasks, dp, math

Wise Men (Easy Version)

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

Maximum White Subtree

dfs and similar, dp, graphs, trees

Sleeping Schedule

dp, implementation

Autocompletion

data structures, dfs and similar, dp

Array Shrinking

dp, greedy

Reality Show

bitmasks, dp

Even Subset Sum Problem

brute force, dp, greedy, implementation

Team Building

bitmasks, dp, greedy, sortings

Kuroni and Antihype

bitmasks, brute force, dp, dsu, graphs

Treeland and Viruses

data structures, dfs and similar, dp, shortest paths, trees

Journey Planning

data structures, dp, greedy, math, sortings

Paint the String

*special problem, dp, strings

M-numbers

*special problem, dp, math

Homecoming

binary search, dp, greedy, strings

Strange Function

dp

Tourism

dp, graphs, probabilities

Au Pont Rouge

binary search, dp, strings

Double Elimination

dp, implementation

Happy New Year

bitmasks, dp, implementation

Skyscrapers (hard version)

data structures, dp, greedy

Skyscrapers (easy version)

brute force, data structures, dp, greedy

Cow and Treats

binary search, combinatorics, dp, greedy, implementation, math

Cow and Message

brute force, dp, math, strings

Animal Observation (hard version)

data structures, dp, greedy

Animal Observation (easy version)

data structures, dp

Air Conditioner

dp, greedy, implementation, sortings, two pointers

Nanosoft

binary search, data structures, dp, implementation

Erase Subsequences

dp, strings

Around the World

bitmasks, combinatorics, dfs and similar, dp, graphs, math, trees

String Coloring (hard version)

data structures, dp

String Coloring (easy version)

constructive algorithms, dp, graphs, greedy, sortings

Making Shapes

dp

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

Minimax Problem

binary search, bitmasks, dp

Two Arrays

combinatorics, dp

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

Harry The Potter

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

Garland

dp, greedy, sortings

New Year and Ascent Sequence

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

New Year Parties

dp, greedy

New Year and Handle Change

binary search, dp

New Year Permutations

combinatorics, dp

K for the Price of One (Hard Version)

dp, greedy, sortings

K for the Price of One (Easy Version)

dp, greedy, sortings

Happy Cactus

dp

Domino for Young

dp, greedy, math

Cards

combinatorics, dp, math, number theory, probabilities

Berry Jam

data structures, dp, greedy, implementation

Red-Blue Graph

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

Common Number

binary search, combinatorics, dp, math

Portals

data structures, dp, greedy, implementation, sortings

Miss Punyverse

dp, greedy, trees

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

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

Wrong Answer on test 233 (Easy Version)

dp

Antenna Coverage

data structures, dp, greedy, sortings

Sweets Eating

dp, greedy, math, sortings

The Contest

data structures, dp, greedy

Yet Another Monster Killing Problem

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

Sum Balance

bitmasks, dfs and similar, dp, graphs

Yet Another Division Into Teams

dp, greedy, sortings

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

Discarding Game

dp, greedy, two pointers

Conference Problem

dp

To Make 1

bitmasks, constructive algorithms, dp, greedy, number theory

Rock Is Push

binary search, dp

Voting (Easy Version)

data structures, dp, greedy

Tiling Terrace

brute force, dp

Find String in a Grid

data structures, dp, strings, trees

Cleaning Robots

dp, trees

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

Turtle

dp, implementation

Ivan the Fool and the Probability Theory

combinatorics, dp, math

Alice and the Unfair Game

binary search, data structures, dp, dsu

Balanced Distribution

data structures, dp, greedy