Congruence Equation

chinese remainder theorem, math, number theory

Stranger Trees

dp, math, matrices, trees

The Monster

dp, greedy, implementation, math

Jamie and Binary Sequence (changed after round)

bitmasks, greedy, math

Jamie and Alarm Snooze

brute force, implementation, math

Coprime Arrays

math, number theory

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Perfect Squares

brute force, implementation, math

Don't Exceed

math, probabilities

Power Substring

math, number theory

Strongly Connected Tournament

dp, graphs, math, probabilities

Modular Exponentiation

implementation, math

Prime Gift

binary search, dfs and similar, math, meet-in-the-middle, number theory, two pointers

Inversion Counting

brute force, math

Minimum Sum

constructive algorithms, greedy, math

Segments

constructive algorithms, math

New Year and Original Order

dp, math

New Year and Entity Enumeration

bitmasks, combinatorics, dp, math

New Year and Arbitrary Arrangement

dp, math, probabilities

New Year and Curling

brute force, geometry, implementation, math

Power Tower

chinese remainder theorem, math, number theory

Seating of Students

brute force, constructive algorithms, math

Almost Difference

data structures, math

Cyclic Cipher

fft, math

GCD of Polynomials

constructive algorithms, math

Unusual Sequences

bitmasks, combinatorics, dp, math, number theory

Remove Extra One

brute force, data structures, math

Position in Fraction

math, number theory

Shovel Sale

constructive algorithms, math

Dividing the numbers

constructive algorithms, graphs, math

Splitting in Teams

constructive algorithms, greedy, math

Restoring the Expression

brute force, hashing, math

Rounding

implementation, math

Nephren Runs a Cinema

chinese remainder theorem, combinatorics, math, number theory

String Mark

combinatorics, math, strings

Square Subsets

bitmasks, combinatorics, dp, math

XK Segments

binary search, math, sortings, two pointers

Marco and GCD Sequence

constructive algorithms, math

Ralph And His Magic Field

combinatorics, constructive algorithms, math, number theory

Counting Arrays

combinatorics, dp, math, number theory

Lust

combinatorics, math, matrices

Pride

brute force, dp, greedy, math, number theory

Mod Mod Mod

binary search, dp, math

Almost Identity Permutations

combinatorics, dp, math

Maximum Element

combinatorics, dp, math

Bertown Subway

dfs and similar, greedy, math

Quadcopter Competition

greedy, math

Packmen Strike Back

binary search, dp, math

Divisiblity of Differences

implementation, math, number theory

Trip For Meal

math

Classroom Watch

brute force, math

Maximum splitting

dp, greedy, math, number theory

The Intriguing Obsession

combinatorics, dp, math

The Eternal Immortality

math

El Toll Caves

math

Flowers and Chocolate

combinatorics, math, matrices

Egg Roulette

bitmasks, brute force, divide and conquer, math, meet-in-the-middle

Make a Permutation!

greedy, implementation, math

Bus

greedy, implementation, math

Circle of Numbers

math

Lazy Security Guard

brute force, geometry, math

k-rounding

brute force, math, number theory

Eleventh Birthday

combinatorics, dp, math

Maxim Buys an Apartment

constructive algorithms, math

Fraction

brute force, constructive algorithms, math

Product transformation

combinatorics, math, number theory

Digits

brute force, implementation, math

Arpa and an exam about geometry

geometry, math

Arpa and a research in Mexican wave

implementation, math

Rainbow Balls

math

Random Elections

bitmasks, brute force, divide and conquer, fft, math

Tournament Construction

constructive algorithms, dp, graphs, greedy, math

Five Dimensional Points

brute force, geometry, math

Days of Floral Colours

combinatorics, divide and conquer, dp, fft, math

Weather Tomorrow

implementation, math

Noise Level

dfs and similar, implementation, math

Random Query

data structures, math, probabilities, two pointers

Shortest Path Problem?

dfs and similar, graphs, math

Rectangles

combinatorics, math

Upgrading Tree

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

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

Ilya And The Tree

dfs and similar, graphs, math, number theory, trees

Godsend

games, math

Leha and Function

combinatorics, greedy, math, number theory, sortings

Mother of Dragons

brute force, graphs, math, meet-in-the-middle

Winter is here

combinatorics, dp, math, number theory

Airplane Arrangements

math, number theory

Prefix Sums

binary search, brute force, combinatorics, math, matrices

Vasya's Function

binary search, implementation, math

Round Subset

dp, math

Key races

math

Ever-Hungry Krakozyabra

brute force, combinatorics, greedy, math

The Meaningless Game

math, number theory

Strange Radiation

binary search, implementation, math

Sasha and Sticks

games, math

Perpetual Motion Machine

constructive algorithms, dp, graphs, implementation, math, trees

Bamboo Partition

brute force, data structures, implementation, math, number theory, sortings, two pointers

Rusty String

fft, math, strings

My pretty girl Noora

brute force, dp, greedy, math, number theory

I'm bored with life

implementation, math, number theory