Hot Start Up (hard version)

data structures, dp

Hot Start Up (easy version)

dp

Gifts from Grandfather Ahmed

dp, math, number theory

Multitest Generator

brute force, dp

Li Hua and Tree

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

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

Counting Factorizations

combinatorics, divide and conquer, dp, math, number theory

Velepin and Marketing

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

Moscow Gorillas

binary search, dp, greedy, implementation, math, 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

Score of a Tree

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

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

Two Chess Pieces

dfs and similar, dp, greedy, 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

Koxia and Sequence

bitmasks, combinatorics, dp, math, number theory

Koxia and Tree

combinatorics, dfs and similar, dp, dsu, math, probabilities, trees

Игра в Девятку I

*special problem, brute force, dp

Wonderful Jump

dp, greedy

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Count Binary Strings

data structures, dp

Decomposition

binary search, brute force, data structures, divide and conquer, dp, two pointers

Chemistry Lab

dp, geometry, probabilities

Card Guessing

combinatorics, dp, probabilities

Doremy's Number Line

dp, greedy, sortings

Doremy's Pegging Game

combinatorics, dp, math

Edge Queries

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

Node Pairs

dp, graphs, math, number theory

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

Good Pairs

binary search, data structures, dp

Anti-median (Hard Version)

combinatorics, dp, math

Anti-median (Easy Version)

dp, math

Wish I Knew How to Sort

dp, math, probabilities

BinaryStringForces

constructive algorithms, data structures, dp

Doping

combinatorics, dp, math

Majority

combinatorics, dp, math, strings

Bracket Cost

binary search, data structures, divide and conquer, dp, greedy, strings

Counting Arrays

combinatorics, dp, math, number theory

Yet Another Array Counting Problem

binary search, data structures, divide and conquer, dp, flows, math, trees

List Generation

combinatorics, dp, math

Olympiad Training

binary search, data structures, dp, flows, geometry, implementation, sortings

Joking (Hard Version)

dp, interactive

Paths on the Tree

dfs and similar, dp, greedy, sortings, trees

Antifibonacci Cut

bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math

Intersection and Union

data structures, dp, matrices, probabilities

FTL

binary search, dp

Kirill and Company

bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths

Arranging Crystal Balls

data structures, divide and conquer, divide and conquer, dp, geometry, graphs, number theory

Conditional Mix

combinatorics, dp, math

Hanging Hearts

constructive algorithms, data structures, dfs and similar, dp, greedy, trees

Keyboard Design

bitmasks, data structures, dp, string suffix structures, strings

Cleaning Robot

bitmasks, dp

Anti-Increasing Addicts

constructive algorithms, dp, greedy, math

Balance Addicts

combinatorics, dp, math, two pointers

Ela Goes Hiking

combinatorics, dp, math, probabilities

Ela and the Wiring Wizard

brute force, dp, graphs, greedy, implementation, shortest paths

Swap and Take

dp, greedy

Good Subarrays (Hard Version)

binary search, data structures, dp, two pointers

Zeros and Ones

bitmasks, divide and conquer, dp, math

Slime Escape

data structures, dp, greedy, two pointers

Conveyor

constructive algorithms, dp, math

Zero-One (Hard Version)

dp, greedy

Location

data structures, dp, math, number theory

Function Sum

brute force, combinatorics, dp, fft, math

Graph Cost

dp, greedy, math, number theory

Almost Sorted

bitmasks, data structures, dp

Cut Substrings

combinatorics, dp, hashing, strings, two pointers

Illumination

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

Letter Picking

constructive algorithms, dp, games, two pointers

Moving Both Hands

dp, graphs, shortest paths

Journey

dp, trees

Electrical Efficiency

combinatorics, data structures, dp, math, number theory, trees

Prefix Function Queries

dfs and similar, dp, hashing, string suffix structures, strings, trees

Xor-Subsequence (hard version)

bitmasks, data structures, dp, strings, trees

Xor-Subsequence (easy version)

bitmasks, brute force, dp, strings, trees, two pointers

Burenka and Traditions (hard version)

data structures, dp, greedy