Swaps

combinatorics, dp, graphs, math

Divide, XOR, and Conquer

bitmasks, dp, math

Speedrun

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

Non-Intersecting Subpermutations

combinatorics, dp, implementation, math

Balanced String

dp

Maximum Monogonosity

brute force, dp, math

Trees and Segments

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

PermuTree (hard version)

bitmasks, dfs and similar, dp, fft, greedy, implementation, math, trees

Mark and Spaceship

brute force, dp

Game Bundles

brute force, constructive algorithms, dp, greedy, math

Expected Destruction

combinatorics, dp, math, probabilities

Earn or Unlock

bitmasks, brute force, dp

Panda Meetups

data structures, dp, flows

Miriany and Matchstick

constructive algorithms, dp, greedy

Ina of the Mountain

data structures, dp, greedy, math

Max to the Right of Min

binary search, data structures, divide and conquer, dp, dsu, two pointers

Vika and Wiki

binary search, bitmasks, combinatorics, divide and conquer, dp, math

Swimmers in the Pool

dp, fft, math, number theory

Boxes and Balls

dp, implementation, math

Multiple of Three Cycles

combinatorics, data structures, dp, dsu, math

Omsk Metro (hard version)

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

Tenzing and Necklace

divide and conquer, dp, greedy

Tenzing and Random Real Numbers

bitmasks, dp, graphs, math, probabilities

Tenzing and Random Operations

combinatorics, dp, math, probabilities

Tenzing and Triangle

data structures, dp, geometry, greedy, math

Railguns

brute force, dfs and similar, dp, graphs

Decreasing Game

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

Ball Sorting

data structures, dp, sortings

Count Supersequences

combinatorics, dp, math

Old Mobile

combinatorics, dp, probabilities

Zombies

binary search, dp

Combinatorics Problem

brute force, combinatorics, dp

The Third Grace

data structures, dp

Mex Tree

brute force, dp, trees

Palindrome Partition

binary search, brute force, data structures, dp, hashing, strings

Range Sorting (Hard Version)

binary search, data structures, dp, greedy

Range Sorting (Easy Version)

binary search, dp, dsu, greedy, trees, two pointers

Walk the Runway

bitmasks, brute force, data structures, dp, graphs, implementation, sortings

LuoTianyi and XOR-Tree

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

Random Walk

dp, graphs, math, probabilities, trees

Removing Graph

brute force, dp, games, graphs, math

Timber

combinatorics, dp, fft, math

Rearrange Brackets

brute force, dp, greedy, sortings, strings

Willy-nilly, Crack, Into Release!

data structures, dp

Misha and Apples

brute force, data structures, dp, two pointers

The Fox and the Complete Tree Traversal

constructive algorithms, dp, implementation, math, trees

Bosco and Particle

dp, math, number theory, strings

XOR Counting

bitmasks, combinatorics, dp, math

Chain Chips

data structures, dp, matrices

Vlad and the Nice Paths (hard version)

binary search, combinatorics, data structures, dp, math, two pointers

Vlad and the Nice Paths (easy version)

combinatorics, dp, math

The Maximum Prefix

dp

Prediction

combinatorics, dp, math

Two Tanks

binary search, dp, implementation, math

Minibuses on Venus (hard version)

brute force, combinatorics, dp, math

Minibuses on Venus (medium version)

combinatorics, divide and conquer, dp, matrices

Minibuses on Venus (easy version)

combinatorics, divide and conquer, dp

DSU Master

combinatorics, dp, dsu, math

There Should Be a Lot of Maximums

brute force, data structures, dfs and similar, dp, trees, two pointers

Code Lock

bitmasks, dp

Routing

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

Accommodation

brute force, dp, greedy, implementation

Another n-dimensional chocolate bar

dp, math, meet-in-the-middle, number theory

The way home

binary search, data structures, dp, graphs, greedy, shortest paths, sortings

Tree Cutting

bitmasks, dfs and similar, dp

Count Voting

combinatorics, dp, math

Halve or Subtract

binary search, brute force, dp, greedy, sortings

Hot Start Up (hard version)

data structures, dp

Gifts from Grandfather Ahmed

dp, math, number theory

Multitest Generator

brute force, dp

Colored Subgraphs

dfs and similar, dp, games, greedy, trees

Maximum Subarray

data structures, dp, greedy, two pointers

Explosions?

binary search, data structures, dp, greedy, math

Labeling the Tree with Distances

data structures, dp, greedy, hashing, implementation, trees

Velepin and Marketing

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

Graph Coloring (hard version)

brute force, combinatorics, divide and conquer, dp, fft, graphs

Graph Coloring (easy version)

combinatorics, dp, graphs

Divisors and Table

brute force, dfs and similar, dp, number theory

Serval and Brain Power

bitmasks, brute force, dp, greedy, implementation, strings

Serval and Music Game

brute force, dp, implementation, math, number theory

Sum Over Zero

data structures, dfs and similar, dp

Codeforces Scoreboard

binary search, data structures, dp, geometry

Infinite Game

brute force, combinatorics, dp, games, probabilities

Wooden Spoon

combinatorics, dp

Different Arrays

brute force, dp, implementation

Bracket Insertion

combinatorics, dp, math, trees

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Maximizing Root

dfs and similar, dp, graphs, math, number theory, trees

Flexible String Revisit

combinatorics, dp, math, probabilities

Parmigiana With Seafood

binary search, dp, greedy, trees

Uniform Chemistry

dp, math

Crossing the Railways

data structures, dp

Vittorio Plays with LEGO Bricks

dp, geometry

Laboratory on Pluto

constructive algorithms, dp, greedy, math

Segment Covering

brute force, combinatorics, constructive algorithms, data structures, dp, trees

Lisa's Sequences

dp

Game of Questions

bitmasks, combinatorics, dp, fft, math, probabilities

Hossam and a Letter

brute force, dp, implementation, two pointers

Hossam and (sub-)palindromic tree

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