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

Frog Fights

data structures, greedy

Finals in arithmetic

constructive algorithms, implementation, math

Guest From the Past

implementation, 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

Wet Shark and Blocks

dp, matrices

Rat Kwesh and Cheese

brute force, constructive algorithms, math

Wet Shark and Flowers

combinatorics, math, number theory, probabilities

Xors on Segments

data structures, strings, trees

New Year Tree

bitmasks, data structures, trees

Professor GukiZ and Two Arrays

binary search, two pointers

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

XOR and Favorite Number

data structures

Polyline

constructive algorithms, implementation

Watering Flowers

implementation

Expensive Strings

data structures, sortings, 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

Hexagons

binary search, implementation, math

Multipliers

math, number theory

Running Track

dp, greedy, strings, trees

Longtail Hedgehog

dp, graphs

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

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

Alphabet Permutations

data structures, strings

Vika and Segments

constructive algorithms, data structures, geometry, two pointers

Harmony Analysis

constructive algorithms

Frogs and mosquitoes

data structures, greedy

Minimum spanning tree for each edge

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

Gadgets for dollars and pounds

binary search, greedy, two pointers

Cross Sum

binary search, geometry

Power Tree

data structures, trees

Marbles

hashing, strings

Zuma

dp

Chain Reaction

binary search, dp

Testing Robots

implementation

Intergalaxy Trips

probabilities, shortest paths

Board Game

data structures, dfs and similar

Freelancer's Dreams

geometry

Lazy Student

constructive algorithms, data structures, graphs

Sorting Railway Cars

constructive algorithms, greedy

Pastoral Oddities

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

Ruminations on Ruminants

geometry, math

Lieges of Legendre

games, math

Moodular Arithmetic

combinatorics, dfs and similar, dsu, math, number theory

Alternative Thinking

dp, greedy, math

A Museum Robbery

data structures, dp

Acyclic Organic Compounds

data structures, dfs and similar, dsu, hashing, strings, trees

Kleofáš and the n-thlon

dp, math, probabilities

Lipshitz Sequence

data structures, math

The Two Routes

graphs, shortest paths

Edge coloring of bipartite graph

graphs

Lomsat gelral

data structures, dfs and similar, dsu, trees

Area of Two Circles' Intersection

geometry

Make Palindrome

constructive algorithms, greedy, strings

Extract Numbers

implementation, strings

Sandy and Nuts

bitmasks, dp, trees

Spongebob and Squares

brute force, math

Day at the Beach

sortings

Cut Length

geometry

Chocolate Bar

brute force, dp

Igor In the Museum

dfs and similar, graphs, shortest paths

Nearest vectors

geometry, sortings

Subsequences

data structures, dp

Restaurant

dp, greedy, sortings

Divisibility

math

Wilbur and Strings

dfs and similar, dp, graphs, strings

Wilbur and Trees

dp, math, probabilities, sortings

Wilbur and Points

combinatorics, greedy, sortings

Pasha and Phone

binary search, math