Frog Fights

data structures, greedy

Finals in arithmetic

constructive algorithms, implementation, math

Transforming Sequence

combinatorics, dp, fft, math

Birthday

greedy, math, probabilities

Electric Charges

binary search, dp

Array GCD

dp, greedy, number theory

The Sum of the k-th Powers

math

Ants in Leaves

dfs and similar, greedy, sortings, trees

Wet Shark and Blocks

dp, matrices

Rat Kwesh and Cheese

brute force, constructive algorithms, math

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

XOR and Favorite Number

data structures

Expensive Strings

string suffix structures, strings

Sum of Remainders

implementation, math, number theory

Hexagons

binary search, implementation, math

Multipliers

math, number theory

Running Track

dp, greedy, strings, trees

Puzzle Lover

dp, hashing, strings

Kingdom and its Cities

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

Necklace

constructive algorithms, math

Simba on the Circle

dp

Square Root of Permutation

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

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

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

Intergalaxy Trips

probabilities, shortest paths

Board Game

data structures, dfs and similar

Freelancer's Dreams

geometry

Pastoral Oddities

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

Ruminations on Ruminants

geometry, math

Lieges of Legendre

games, 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

Edge coloring of bipartite graph

graphs

Lomsat gelral

data structures, dfs and similar, dsu, trees

Area of Two Circles' Intersection

geometry

Sandy and Nuts

bitmasks, dp, trees

Cut Length

geometry

Chocolate Bar

brute force, dp

Nearest vectors

geometry, sortings

Wilbur and Strings

dfs and similar, dp, graphs, strings

Wilbur and Trees

dp, math, probabilities, sortings

Cutting the Line

string suffix structures, strings

REQ

data structures, number theory

Edo and Magnets

brute force, greedy, implementation, two pointers

Max and Bike

binary search, geometry

Warrior and Archer

games

Strange Calculation and Cats

dp, matrices

Happy Tree Party

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

Beautiful Function

constructive algorithms, math

BCPC

binary search, geometry, two pointers

Super M

dfs and similar, dp, graphs, trees

Birthday

graph matchings, strings

Top Secret Task

dp

Three States

dfs and similar, graphs, shortest paths

Chip 'n Dale Rescue Rangers

binary search, geometry, math

Duff is Mad

data structures, strings

Duff as a Queen

data structures

Duff in Mafia

2-sat, binary search

Duff in the Army

data structures, trees

Duff in Beach

dp

Digits of Number Pi

dp, implementation, strings

Present for Vitalik the Philatelist

combinatorics, math, number theory

Lizard Era: Beginning

meet-in-the-middle

Alice, Bob, Oranges and Apples

number theory

Anton and Ira

constructive algorithms, greedy, math

Boolean Function

bitmasks, dp, expression parsing

Number of Binominal Coefficients

dp, math, number theory

Superior Periodic Subarrays

number theory

Zublicanes and Mumocrates

dp, trees, two pointers

Kojiro and Furrari

dp, greedy

Kefa and Watch

data structures, hashing, strings

Mirror Box

matrices, trees

Walking!

constructive algorithms, greedy

LCS Again

dp, greedy

Weakness and Poorness

ternary search

Painting Edges

binary search, data structures

Flights for Regular Customers

dp, matrices

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Invariance of Tree

constructive algorithms, dfs and similar, greedy, trees

Robots protection

data structures

Run for beer

dfs and similar, shortest paths