LuoTianyi and Cartridge

data structures, trees

LuoTianyi and the Function

data structures

LuoTianyi and XOR-Tree

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

LuoTianyi and the Floating Islands (Hard Version)

combinatorics, dfs and similar, math, probabilities, trees

Random Walk

dp, graphs, math, probabilities, trees

Removing Graph

brute force, dp, games, graphs, math

Magic Triples (Hard Version)

brute force, data structures, math, number theory

Timber

combinatorics, dp, fft, math

Rearrange Brackets

brute force, dp, greedy, sortings, strings

Willy-nilly, Crack, Into Release!

data structures, dp

Roads in E City

interactive, math, probabilities, trees

Misha and Apples

brute force, data structures, dp, two pointers

The Fox and the Complete Tree Traversal

constructive algorithms, dp, implementation, math, trees

Entangled Substrings

string suffix structures, strings

Half-sum

brute force, divide and conquer, greedy

Toy Machine

constructive algorithms, games, implementation

Similar Polynomials

combinatorics, math

OH NO1 (-2-3-4)

constructive algorithms, graphs, math

Bosco and Particle

dp, math, number theory, strings

XOR Counting

bitmasks, combinatorics, dp, math

Between

constructive algorithms, dfs and similar, graphs, greedy

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Communication Towers

brute force, divide and conquer, dsu

Chain Chips

data structures, dp, matrices

Balancing Weapons

binary search, brute force, data structures, math, two pointers

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

Is It Flower?

dfs and similar, graphs, implementation

Last Number

combinatorics, math

The Maximum Prefix

dp

M-tree

data structures, math, sortings, trees

Monsters

brute force, data structures, dfs and similar, dsu, graphs, greedy

Prediction

combinatorics, dp, math

Traveling in Berland

binary search, data structures, graphs, greedy, implementation

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

Petya, Petya, Petr, and Palindromes

binary search, brute force, data structures, two pointers

GCD Master (hard version)

greedy, math, sortings

GCD Master (easy version)

greedy, math, number theory, sortings

Tree Master

brute force, data structures, dfs and similar, trees

DSU Master

combinatorics, dp, dsu, math

Survival of the Weakest (hard version)

greedy, math, sortings, two pointers

Survival of the Weakest (easy version)

binary search, brute force, implementation, math, sortings

There Should Be a Lot of Maximums

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

Code Lock

bitmasks, dp

Flow Control

data structures, dsu, implementation

Approximate Diameter

binary search, divide and conquer, graphs, shortest paths

Routing

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

Accommodation

brute force, dp, greedy, implementation

A task for substrings

data structures, string suffix structures, strings

Another n-dimensional chocolate bar

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

Gasoline prices

data structures, divide and conquer, dsu, hashing, trees

The way home

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

Symmetree

dfs and similar, hashing, implementation, trees

Tree Cutting

bitmasks, dfs and similar, dp

Count Voting

combinatorics, dp, math

Halve or Subtract

binary search, brute force, dp, greedy, sortings

City Union

constructive algorithms, dfs and similar, dsu, geometry, greedy, implementation, math

Hot Start Up (hard version)

data structures, dp

Gifts from Grandfather Ahmed

dp, math, number theory

Multitest Generator

brute force, dp

Li Hua and Path

data structures, dfs and similar, divide and conquer, dsu, trees

Li Hua and Array

brute force, data structures, dsu, math, number theory, two pointers

Strange Triples

brute force, math, number theory

Colored Subgraphs

dfs and similar, dp, games, greedy, trees

Maximum Subarray

data structures, dp, greedy, two pointers

Removal Sequences

bitmasks, dfs and similar, graphs

Blocking Chips

binary search, constructive algorithms, dfs and similar, greedy, trees

Explosions?

binary search, data structures, dp, greedy, math

Labeling the Tree with Distances

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

Rebrending

brute force, data structures, divide and conquer, implementation

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

Tokens on Graph

constructive algorithms, dfs and similar, graphs, shortest paths

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

Serval and Brain Power

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

Serval and Music Game

brute force, dp, implementation, math, number theory

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Sum Over Zero

data structures, dfs and similar, dp

Moving Dots

binary search, brute force, combinatorics, math, two pointers

Treasure Hunt

data structures, divide and conquer, two pointers

Codeforces Scoreboard

binary search, data structures, dp, geometry

Colorful Tree Again

brute force, data structures, trees

Inverse Transformation

constructive algorithms, implementation, math

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Minimums or Medians

Infinite Game

brute force, combinatorics, dp, games, probabilities

Wooden Spoon

combinatorics, dp

Monsters (hard version)

data structures, greedy

Weighed Tree Radius

data structures, divide and conquer, implementation, trees

Double Sort II

dfs and similar, flows, graph matchings, graphs

Game of the Year

brute force, data structures, math, number theory

Different Arrays

brute force, dp, implementation

Window Signals (hard version)

Window Signals (easy version)