Numbers

combinatorics, dp

Greg and Friends

combinatorics, dp, graphs, shortest paths

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

On the Bench

combinatorics, dp

Small Permutation Problem (Easy Version)

brute force, combinatorics, dp, math

Sky Full of Stars

combinatorics, math

Sasha and the Wedding Binary Search Tree

brute force, combinatorics, data structures, dfs and similar, math, trees

Bots

combinatorics, dp, math, number theory

Non-Intersecting Subpermutations

combinatorics, dp, implementation, math

Vlad and the Nice Paths (hard version)

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

Memory and Scores

combinatorics, dp, math

AND Segments

bitmasks, combinatorics, data structures, dp, two pointers

Special Matrices

combinatorics, dp

Natasha, Sasha and the Prefix Sums

combinatorics, dp, math, number theory

Triangles

combinatorics, graphs, math

Square Root of Permutation

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

PermutationForces II

brute force, combinatorics, greedy, sortings, trees, two pointers

Scalar Queries

combinatorics, data structures, math, sortings

Bubble Strike

combinatorics, math, probabilities, ternary search

Circular Mirror

binary search, combinatorics, geometry, math, two pointers

Happy Sets

combinatorics

Crypto Lights

combinatorics, dp, math, probabilities

Hyperregular Bracket Strings

combinatorics, greedy, hashing, math, number theory, sortings

Partial Sums

combinatorics, math, number theory

Permutation Sum

bitmasks, combinatorics, dp, implementation, meet-in-the-middle

Culture Code

binary search, combinatorics, data structures, dp, shortest paths, sortings

Devu and Birthday Celebration

combinatorics, dp, math

Clues

combinatorics, graphs

Beautiful Rectangle

brute force, combinatorics, constructive algorithms, data structures, greedy, math

Wrong Answer on test 233 (Hard Version)

combinatorics, math

On Number of Decompositions into Multipliers

combinatorics, math, number theory

Balance Addicts

combinatorics, dp, math, two pointers

Farm Game

combinatorics, games

Vika and Wiki

binary search, bitmasks, combinatorics, divide and conquer, dp, math

Little Elephant and Elections

brute force, combinatorics, dp

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

Chaotic Merge

combinatorics, dp, math, strings

Expected Destruction

combinatorics, dp, math, probabilities

Magic Trick

combinatorics, math, probabilities

Table

bitmasks, combinatorics, dp, math

Is it rated - 3

*special problem, combinatorics, dp, math

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Count Supersequences

combinatorics, dp, math

Relatively Prime Powers

combinatorics, math, number theory

Karen and Test

brute force, combinatorics, constructive algorithms, math

Almost Perfect

combinatorics, fft, math

Ehab and the Expected GCD Problem

combinatorics, dp, math, number theory

Axis Walking

bitmasks, combinatorics, constructive algorithms, dp, meet-in-the-middle

Dominoes

combinatorics, fft, graphs, math, number theory

Koxia and Tree

combinatorics, dfs and similar, dp, dsu, math, probabilities, trees

Partitions

combinatorics, math, number theory

Fenwick Tree

bitmasks, brute force, combinatorics, data structures, dp, math, trees

Sasha and Interesting Fact from Graph Theory

brute force, combinatorics, dp, math, trees

Bash Plays with Functions

brute force, combinatorics, dp, number theory

Lucky Permutation

brute force, combinatorics, number theory

Counting Is Fun (Easy Version)

brute force, combinatorics, dp, math

Minibuses on Venus (easy version)

combinatorics, divide and conquer, dp

Diameter Cuts

combinatorics, dfs and similar, dp, trees

Different Subsets For All Tuples

combinatorics, math

Max History

combinatorics, math

Compartments

combinatorics, constructive algorithms, greedy, implementation

Light Bulbs (Hard Version)

combinatorics, data structures, dfs and similar, dp, graphs, hashing

Alex and a TV Show

bitmasks, combinatorics, number theory

The Wall (medium)

combinatorics

BFS Trees

combinatorics, dfs and similar, graphs, math, shortest paths, trees

Abnormal Permutation Pairs (easy version)

combinatorics, dp, fft, math

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Dima and Horses

combinatorics, constructive algorithms, graphs

Beautiful Bracket Sequence (easy version)

combinatorics, dp, probabilities

Emotional Fishermen

combinatorics, dp, math, two pointers

Rare Coins

combinatorics, math, probabilities

Non-equal Neighbours

combinatorics, dp, math

Sonya and Informatics

combinatorics, dp, matrices, probabilities

Красивая команда

*special problem, combinatorics, math

Coloring

brute force, combinatorics, constructive algorithms, dp, geometry, graphs, greedy, implementation, math

Cowmpany Cowmpensation

combinatorics, dp, math, trees

Cow and Treats

binary search, combinatorics, dp, greedy, implementation, math

Fancy Stack

combinatorics, dp, implementation

Typical Party in Dorm

bitmasks, combinatorics, dp, strings

New Year and Castle Construction

combinatorics, geometry, math, sortings

String Mark

combinatorics, math, strings

Travel Plan

combinatorics, dp, implementation, math, trees

Sereja and Intervals

combinatorics, dp

Beautiful Pairs of Numbers

combinatorics, dp

Classical?

binary search, combinatorics, number theory

Levko and Strings

combinatorics, dp

Two Arrays

bitmasks, brute force, combinatorics, greedy, hashing, math, two pointers

XOR Counting

bitmasks, combinatorics, dp, math

Present for Vitalik the Philatelist

combinatorics, math, number theory

Bandit Blues

combinatorics, dp, fft, math

Oolimry and Suffix Array

combinatorics, constructive algorithms, math

Side Transmutations

combinatorics, strings

Good Contest

combinatorics, dp, probabilities

Carousel of Combinations

brute force, combinatorics, dp, math, number theory

Bags with Balls

combinatorics, dp, math, number theory

Barrels and boxes

brute force, combinatorics, math, number theory, probabilities

2..3...4.... Wonderful! Wonderful!

combinatorics, dp, math

Bath Queue

combinatorics, dp, probabilities

Maximum Element

combinatorics, dp, math

Mathematics Curriculum

brute force, combinatorics, dp, trees