Divide Points

constructive algorithms, geometry, math

Asterism (Hard Version)

binary search, combinatorics, dp, math, number theory, sortings

Omkar and Forest

combinatorics, graphs, math, shortest paths

Segment Sum

bitmasks, combinatorics, dp, math

388535 (Hard Version)

bitmasks, brute force, data structures, math

Tree Array

brute force, combinatorics, dp, graphs, math, probabilities, trees

LuoTianyi and the Floating Islands (Hard Version)

combinatorics, dfs and similar, math, probabilities, trees

Prefix Product Sequence

constructive algorithms, math, number theory

Another Filling the Grid

combinatorics, dp, math

Product Oriented Recurrence

dp, math, matrices, number theory

Anton and School - 2

combinatorics, dp, math, number theory

Mike and Foam

bitmasks, combinatorics, dp, math, number theory

Placing Rooks

combinatorics, fft, math

Bitwise Queries (Hard Version)

bitmasks, constructive algorithms, interactive, math

Grid Xor

constructive algorithms, greedy, implementation, interactive, math

Sasha and Array

data structures, math, matrices

Errich-Tac-Toe (Hard Version)

constructive algorithms, math

Count Pairs

math, matrices, number theory, two pointers

The Child and Sequence

data structures, math

Marmots (medium)

math

Beautiful Function

constructive algorithms, math

Tetris revisited

constructive algorithms, graph matchings, greedy, math

Olya and Graph

combinatorics, math

Three Horses

constructive algorithms, math, number theory

Product transformation

combinatorics, math, number theory

Plumber

math

Knitting Batik

implementation, math

Smart Cheater

data structures, math, probabilities

Interstellar battle

math, probabilities, trees

GCD Festival

math, number theory

Running Over The Bridges

greedy, implementation, math

Restoring Numbers

constructive algorithms, math

Dima and Magic Guitar

brute force, implementation, math

Evaluate It and Back Again

constructive algorithms, implementation, math

Furlo and Rublo and Game

games, implementation, math

Arthur and Questions

greedy, implementation, math, ternary search

Prairie Partition

binary search, constructive algorithms, greedy, math

Yet Another String Matching Problem

fft, math

Seating of Students

brute force, constructive algorithms, math

Bear and Polynomials

hashing, implementation, math

Double Happiness

brute force, math, number theory

Gaining Rating

binary search, greedy, implementation, math, sortings, two pointers

Big Secret

constructive algorithms, math

Network Safety

dfs and similar, dsu, graphs, math, sortings

Karen and Test

brute force, combinatorics, constructive algorithms, math

GCD of Polynomials

constructive algorithms, math

Brackets in Implications

constructive algorithms, greedy, implementation, math

Interactive Treasure Hunt

brute force, constructive algorithms, geometry, interactive, math

Guess the Root

brute force, interactive, math

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Number Transformation II

greedy, math

Numerical Sequence (hard version)

binary search, math

Decypher the String

bitmasks, chinese remainder theorem, constructive algorithms, interactive, math

Math

*special problem, math

A Heap of Heaps

brute force, data structures, math, sortings

Demiurges Play Again

dfs and similar, dp, math, trees

Square Root of Permutation

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

Vlad and the Nice Paths (hard version)

binary search, combinatorics, data structures, dp, math, two pointers

Memory and Scores

combinatorics, dp, math

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

List Of Integers

binary search, bitmasks, brute force, combinatorics, math, number theory

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Node Pairs

dp, graphs, math, number theory

K and Medians

constructive algorithms, greedy, math

Lieges of Legendre

games, math

Pluses everywhere

combinatorics, dp, math, number theory

Chain Reaction

binary search, data structures, dsu, greedy, implementation, math, number theory

Fill the Matrix

data structures, greedy, math

Another Sith Tournament

bitmasks, dp, math, probabilities

Explosions?

binary search, data structures, dp, greedy, math

RPD and Rap Sheet (Hard Version)

brute force, constructive algorithms, interactive, math

Valid Bitonic Permutations

combinatorics, dp, implementation, math, number theory

Serge and Dining Room

binary search, data structures, graph matchings, greedy, implementation, math, trees

Two chandeliers

binary search, brute force, chinese remainder theorem, math, number theory

Star MST

combinatorics, dp, graph matchings, math

Water Level

brute force, graphs, greedy, implementation, math

LIS of Sequence

data structures, dp, greedy, hashing, math

Two Hundred Twenty One (hard version)

data structures, math

Strictly Positive Matrix

graphs, math

Cute Sequences

binary search, brute force, greedy, math

Girl Permutation

combinatorics, dp, math, number theory

Two Types of Spells

binary search, data structures, greedy, implementation, math, sortings

The minimal unique substring

constructive algorithms, math, strings

Nezzar and Nice Beatmap

constructive algorithms, geometry, greedy, math, sortings

Mocha and Stars

combinatorics, dp, fft, math, number theory

Count Seconds

brute force, constructive algorithms, dp, graphs, implementation, math

In Search of Truth (Easy Version)

constructive algorithms, interactive, math, meet-in-the-middle, probabilities

New Year and Arbitrary Arrangement

dp, math, probabilities

Power Board

brute force, dp, math, number theory

Mike and Frog

brute force, greedy, implementation, math

Magic Triples (Hard Version)

brute force, data structures, math, number theory

Kill Anton

brute force, constructive algorithms, data structures, math, strings

Figure Fixing

constructive algorithms, dfs and similar, dsu, graphs, greedy, math

Madoka and The Best University

math, number theory

Vika and Bonuses

binary search, brute force, math, ternary search

Priority Queue

combinatorics, dp, implementation, math, ternary search

Makoto and a Blackboard

dp, math, number theory, probabilities

New Game Plus!

constructive algorithms, greedy, math

Minimum Possible LCM

brute force, greedy, math, number theory

Divisor Paths

combinatorics, graphs, greedy, math, number theory