A Battle Against a Dragon

*special problem, data structures, dp

Colored Jenga

dfs and similar, dp, probabilities

Clever Fat Rat

dp

Poachers

dp, games, graphs, trees

Summer Reading

dp, greedy

Hyper String

dp

Journey

dp, math

Flags

dp, math, matrices

Shoe Store

dp, graph matchings, greedy, sortings, two pointers

Packmen Strike Back

binary search, dp, math

Journey

dp, trees

Wilbur and Strings

dfs and similar, dp, graphs, strings

Rhombus

brute force, data structures, dp

Keen Tree Calculation

binary search, data structures, dp, geometry, graphs, implementation, trees

Colorful Stones

dp, two pointers

Igor and Interesting Numbers

brute force, combinatorics, dp, math

Horse Races

dp, math

Guards In The Storehouse

bitmasks, dp

Electrical Efficiency

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

Half-decay tree

data structures, divide and conquer, dp, math, probabilities

Garden

bitmasks, dp, graphs, trees

The Great Julya Calendar

dp

Write The Contest

binary search, dp, math

Polycarpus the Safecracker

brute force, dp

Gifts from Grandfather Ahmed

dp, math, number theory

World of Darkraft

dp, games

Tachibana Kanade's Tofu

dp

Candies and Stones

divide and conquer, dp

Encryption (hard)

data structures, dp

Double Elimination

dp, implementation

Crisp String

bitmasks, dp

Choosing Two Paths

dfs and similar, dp, greedy, trees

Multiset of Strings

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

Jeff and Brackets

dp, matrices

Sereja and Sets

dp

Path Counting

combinatorics, dp

Tree

dp

Compute Power

binary search, dp, greedy

Summer Practice Report

dp, greedy

Alice and the Unfair Game

binary search, data structures, dp, dsu

Minibuses on Venus (medium version)

combinatorics, divide and conquer, dp, matrices

Almost Increasing Array

data structures, dp

Function Sum

brute force, combinatorics, dp, fft, math

Hossam and a Letter

brute force, dp, implementation, two pointers

Genetic engineering

dp, string suffix structures, trees

Colored Subgraphs

dfs and similar, dp, games, greedy, trees

The Child and Polygon

dp, geometry

Maze

dfs and similar, dp, probabilities, trees

Maximum And Queries (hard version)

bitmasks, divide and conquer, dp, greedy

Segments on the Line

binary search, dp

Nobody is needed

2-sat, data structures, dfs and similar, dp

Laboratory on Pluto

constructive algorithms, dp, greedy, math

New Year and Entity Enumeration

bitmasks, combinatorics, dp, math

Connecting Vertices

dp, graphs

Serval and Music Game

brute force, dp, implementation, math, number theory

Zeros and Ones

bitmasks, divide and conquer, dp, math

Christmas Game

bitmasks, data structures, dfs and similar, dp, games, math, trees

Baby Ehab Plays with Permutations

combinatorics, dp, math

Small Permutation Problem (Hard Version)

combinatorics, dp, math

Balance

dp

Algebra Flash

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

Expected Square Beauty

dp, math, probabilities

DSU Master

combinatorics, dp, dsu, math

Battle Lemmings

dp, greedy

Tree

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

Ostap and Tree

dp, trees

The Top Scorer

combinatorics, dp, math, probabilities

Construct Tree

bitmasks, constructive algorithms, dp, trees

Ela Goes Hiking

combinatorics, dp, math, probabilities

Dead Ends

bitmasks, dp

K-Set Tree

combinatorics, dfs and similar, dp, math, trees

Financiers Game

dp

Narrow Components

brute force, data structures, dp, dsu, math, trees

Miss Punyverse

dp, greedy, trees

Game with Cards

binary search, constructive algorithms, data structures, dp, greedy, implementation

Cats on the Upgrade (easy version)

brute force, data structures, dfs and similar, divide and conquer, dp, graphs, trees

Summoning Minions

constructive algorithms, dp, flows, graph matchings, greedy, sortings

Independent Set

dfs and similar, dp, trees

Roads in the Kingdom

dfs and similar, dp, graphs, trees

Bags with Balls

combinatorics, dp, math, number theory

Gojou and Matrix Game

data structures, dp, games, hashing, implementation, math, number theory, sortings

Swap and Maximum Block

bitmasks, data structures, dfs and similar, divide and conquer, dp

Text Editor

brute force, dp, greedy, strings

Levko and Strings

combinatorics, dp

Controversial Rounds

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

Cow and Treats

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

Strange Function

binary search, data structures, dp, greedy

Leaf Partition

dp, trees

Happy New Year

bitmasks, dp, implementation

Bear and Company

dp

Up and Down the Tree

dfs and similar, dp, trees

Replace on Segment

dp, graph matchings

Museums Tour

dp, graphs, implementation

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Removing Graph

brute force, dp, games, graphs, math

Tokitsukaze and Permutations

dp, math

Nanosoft

binary search, data structures, dp, implementation

Move and Swap

dfs and similar, dp, greedy, trees

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Legen...

data structures, dp, matrices, strings