Again Twenty Five!

number theory

Famil Door and Roads

combinatorics, data structures, dfs and similar, dp, probabilities, trees

Babaei and Birthday Cake

data structures, dp

Famil Door and Brackets

dp, strings

Far Relative’s Problem

brute force

Far Relative’s Birthday Cake

brute force, combinatorics, constructive algorithms, implementation

Bear and Fair Set

flows, graphs

Zbazi in Zeydabad

data structures, implementation

Magic Numbers

dp

Bear and String Distance

greedy, strings

New Skateboard

dp

Tennis Tournament

implementation, math

Island Puzzle

dfs and similar, dsu, graphs, trees

Orchestra

two pointers

Preorder Test

binary search, dfs and similar, dp, graphs, greedy, trees

Package Delivery

data structures, divide and conquer, greedy

Factory Repairs

data structures

XOR Equation

dp, math

Raffles

data structures, dp, greedy, math

Group Projects

dp

Simple Skewness

binary search, math, ternary search

Jerry's Protest

brute force, combinatorics, dp, probabilities

Block Towers

brute force, greedy, math, number theory

Cards

constructive algorithms, dp, math

Robot Sequence

brute force, implementation

Frog Fights

data structures, greedy

Finals in arithmetic

constructive algorithms, implementation, math

K-special Tables

constructive algorithms, implementation

War of the Corporations

constructive algorithms, greedy, strings

Guest From the Past

implementation, math

Making a String

greedy, sortings

Save Luke

math

Transforming Sequence

combinatorics, dp, fft, math

Birthday

greedy, math, probabilities

Electric Charges

binary search, dp

Array GCD

dp, greedy, number theory

Graph and String

constructive algorithms, graphs

The Sum of the k-th Powers

math

Ants in Leaves

dfs and similar, greedy, sortings, trees

Optimal Number Permutation

constructive algorithms

Not Equal on a Segment

data structures, implementation

The Time

implementation

Infinite Sequence

implementation, math

Wet Shark and Blocks

dp, matrices

Rat Kwesh and Cheese

brute force, constructive algorithms, math

Wet Shark and Flowers

combinatorics, math, number theory, probabilities

Wet Shark and Bishops

combinatorics, implementation

Wet Shark and Odd and Even

implementation

Xors on Segments

data structures, strings, trees

New Year Tree

bitmasks, data structures, trees

Professor GukiZ and Two Arrays

binary search, two pointers

Pearls in a Row

greedy

Grandfather Dovlet’s calculator

implementation

Professor GukiZ's Robot

implementation, math

Combining Slimes

dp, math, matrices, probabilities

Double Knapsack

constructive algorithms, two pointers

Robot Arm

data structures, geometry

Hamiltonian Spanning Tree

dfs and similar, dp, graph matchings, greedy, trees

Constellation

geometry, implementation

Guess the Permutation

constructive algorithms

Slime Combining

implementation

XOR and Favorite Number

data structures

Polyline

constructive algorithms, implementation

Watering Flowers

implementation

Chocolate

combinatorics

Elephant

math

Expensive Strings

string suffix structures, strings

Sum of Remainders

implementation, math, number theory

Longest k-Good Segment

binary search, data structures, two pointers

The Labyrinth

dfs and similar

Dinner with Emma

games, greedy

Comparing Two Long Integers

implementation, strings

Hexagons

binary search, implementation, math

Multipliers

math, number theory

Running Track

dp, greedy, strings, trees

Longtail Hedgehog

dp, graphs

Bulbs

implementation

Gena's Code

implementation, math

Link/Cut Tree

brute force, implementation

Puzzle Lover

dp, hashing, strings

Kingdom and its Cities

dfs and similar, divide and conquer, dp, graphs, sortings, trees

Necklace

constructive algorithms, math

Skills

binary search, brute force, dp, greedy, sortings, two pointers

Peter and Snow Blower

binary search, geometry, ternary search

Simba on the Circle

dp

Square Root of Permutation

combinatorics, constructive algorithms, dfs and similar, graphs, math

The Union of k-Segments

greedy, sortings

Replace To Make Regular Bracket Sequence

data structures, expression parsing, math

HDD is Outdated Technology

implementation, math

The Text Splitting

brute force, implementation, strings

New Year and Forgotten Tree

constructive algorithms, flows, graphs

New Year and Cake

geometry, two pointers

New Year and Cleaning

binary search, implementation

New Year and Three Musketeers

data structures, greedy, sortings

New Year and Ancient Prophecy

dp, hashing, strings

New Year and Domino

dp, implementation

New Year and Old Property

bitmasks, brute force, implementation

New Year and Days

implementation

Alphabet Permutations

data structures, strings

Vika and Segments

constructive algorithms, data structures, geometry, two pointers