Caisa and Tree

brute force, dfs and similar, math, number theory, trees

Little Dima and Equation

brute force, implementation, math, number theory

Fedya and Maths

math, number theory

Devu and Flowers

bitmasks, combinatorics, number theory

Jzzhu and Squares

dp, math, number theory

Jzzhu and Apples

constructive algorithms, number theory

Divisors

brute force, dfs and similar, implementation, number theory

DZY Loves Fibonacci Numbers

data structures, math, number theory

Devu and Partitioning of the Array

brute force, constructive algorithms, implementation, number theory

The Child and Binary Tree

combinatorics, divide and conquer, fft, number theory

Mashmokh and ACM

combinatorics, dp, number theory

Mashmokh and Numbers

constructive algorithms, number theory

Upgrading Array

dp, greedy, math, number theory

Roman and Numbers

bitmasks, brute force, combinatorics, dp, number theory

On Sum of Fractions

math, number theory

On Number of Decompositions into Multipliers

combinatorics, math, number theory

Bear and Prime Numbers

binary search, brute force, data structures, dp, implementation, math, number theory

Divisible by Seven

math, number theory

Fox Dividing Cheese

math, number theory

Beautiful Set

brute force, number theory

Levko and Permutation

constructive algorithms, math, number theory

Levko and Sets

number theory

Prime Number

math, number theory

Vasya and Beautiful Arrays

brute force, dp, number theory

Find Maximum

implementation, math, number theory

Apple Tree

dfs and similar, number theory, trees

Doodle Jump

math, number theory

Alice and Bob

games, math, number theory

Rational Resistance

math, number theory

GCD Table

chinese remainder theorem, math, number theory

Divisor Tree

brute force, number theory, trees

Quiz

binary search, greedy, math, matrices, number theory

Routine Problem

greedy, math, number theory

Vasily the Bear and Beautiful Strings

combinatorics, math, number theory

Vasily the Bear and Sequence

brute force, greedy, implementation, number theory

Ilya and Bank Account

implementation, number theory

White, Black and White Again

combinatorics, number theory

Rotatable Number

math, number theory

Minimum Modular

brute force, graphs, math, number theory

Empire Strikes Back

binary search, math, number theory

Ksusha and Array

brute force, number theory, sortings

Shaass and Painter Robot

brute force, implementation, number theory

Shaass and Lights

combinatorics, number theory

Cube Problem

brute force, math, number theory

Cows and Primitive Roots

implementation, math, number theory

Cows and Cool Sequences

dp, math, number theory

Beautiful Decomposition

dp, games, greedy, number theory

Three Horses

constructive algorithms, math, number theory

Prime Matrix

binary search, brute force, math, number theory

Subtractions

math, number theory

Good Sequences

dp, number theory

Number Transformation

dp, greedy, number theory

Chilly Willy

math, number theory

Primes on Interval

binary search, number theory, two pointers

Easy Number Challenge

implementation, number theory

Number Challenge

combinatorics, dp, implementation, math, number theory

LCM Challenge

number theory

T-primes

binary search, implementation, math, number theory

Anniversary

data structures, implementation, math, matrices, number theory

Unsolvable

math, number theory

Well-known Numbers

binary search, greedy, number theory

Partial Sums

combinatorics, math, number theory

Reducing Fractions

implementation, math, number theory, sortings

Martian Luck

math, number theory

Periodical Numbers

combinatorics, dp, number theory

Tractor College

implementation, math, number theory, ternary search

Hexadecimal's theorem

brute force, constructive algorithms, implementation, number theory

Visit of the Great

math, number theory

Divisibility Rules

math, number theory

Rectangular Game

number theory

Rectangular Game

number theory

Calendar Reform

*special problem, number theory

Pseudorandom Sequence Period

*special problem, implementation, number theory

ucyhf

*special problem, brute force, implementation, number theory

Ice Sculptures

*special problem, brute force, number theory

Colliders

math, number theory

Win or Freeze

games, math, number theory

Pairs of Numbers

brute force, dfs and similar, math, number theory

Prime Permutation

implementation, number theory, strings

Lucky Division

brute force, number theory

Lucky Permutation

brute force, combinatorics, number theory

Very Interesting Game

brute force, number theory

Double Happiness

brute force, math, number theory

Petya and Divisors

binary search, data structures, number theory

Lostborn

dp, math, number theory

Toy Army

math, number theory

Numbers

dp, math, number theory

Beaver Game

dp, games, number theory

Modified GCD

binary search, number theory

Chessboard Billiard

dfs and similar, dsu, graphs, number theory

Morrowindows

math, number theory

Round Table Knights

dp, math, number theory

Irrational problem

implementation, number theory

Petya and His Friends

constructive algorithms, math, number theory

Prime Segment

*special problem, brute force, math, number theory

Fortune Telling

implementation, number theory

Beautiful numbers

dp, number theory

Prime Problem

number theory

Number With The Given Amount Of Divisors

brute force, dp, number theory

Almost Prime

number theory