Drazil and His Happy Friends

brute force, dsu, meet-in-the-middle, number theory

Everyone is a Winner!

binary search, math, meet-in-the-middle, number theory

Good Numbers (hard version)

binary search, greedy, math, meet-in-the-middle

Mysterious Crime

brute force, combinatorics, math, meet-in-the-middle, two pointers

k-Interesting Pairs Of Integers

*special problem, bitmasks, brute force, meet-in-the-middle

Golden System

math, meet-in-the-middle

Maximum Subsequence

bitmasks, divide and conquer, meet-in-the-middle

Inversions problem

brute force, dfs and similar, dp, meet-in-the-middle

Vanya and Scales

brute force, dp, greedy, math, meet-in-the-middle, number theory

Dasha and Nightmares

bitmasks, hashing, meet-in-the-middle, strings

Chocolate

brute force, dfs and similar, math, meet-in-the-middle, number theory

Event Dates

greedy, meet-in-the-middle, sortings

Permutation Sum

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

Xor-Paths

bitmasks, brute force, dp, meet-in-the-middle

Anya and Cubes

binary search, bitmasks, brute force, dp, math, meet-in-the-middle

Red-Black Number

dfs and similar, dp, implementation, math, meet-in-the-middle

Field expansion

brute force, dp, meet-in-the-middle

In Search of Truth (Easy Version)

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

Helping Hiasat

bitmasks, brute force, dp, meet-in-the-middle

Lizard Era: Beginning

meet-in-the-middle

Axis Walking

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

Number of k-good subarrays

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

Make Them Similar

bitmasks, brute force, hashing, meet-in-the-middle

Prime Gift

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

Simplified Nonogram

bitmasks, dp, hashing, meet-in-the-middle

In Search of Truth (Hard Version)

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

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Multiset of Strings

bitmasks, brute force, dp, fft, flows, graphs, math, meet-in-the-middle, trees

Omkar and Akmar

chinese remainder theorem, combinatorics, constructive algorithms, fft, games, geometry, math, meet-in-the-middle, string suffix structures

Wise Men (Easy Version)

bitmasks, brute force, dp, meet-in-the-middle

Playoff Restoration

bitmasks, brute force, hashing, implementation, meet-in-the-middle

Light switches

meet-in-the-middle

Mother of Dragons

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

Number Clicker

divide and conquer, graphs, meet-in-the-middle, number theory

Another n-dimensional chocolate bar

dp, math, meet-in-the-middle, number theory

Interesting Sections

data structures, divide and conquer, meet-in-the-middle, two pointers

Bears and Juice

dp, math, meet-in-the-middle

Graph And Numbers

bitmasks, brute force, combinatorics, dp, meet-in-the-middle

Long Binary String

bitmasks, math, matrices, meet-in-the-middle, number theory

Wavy numbers

brute force, dfs and similar, meet-in-the-middle, sortings

Down Below

binary search, dfs and similar, graphs, greedy, meet-in-the-middle, shortest paths

Permanent

dp, graph matchings, math, meet-in-the-middle

Equal Trees

*special problem, graphs, meet-in-the-middle

Math, math everywhere

brute force, dp, math, meet-in-the-middle, number theory

Egg Roulette

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

Two Sorts

binary search, dfs and similar, math, meet-in-the-middle

Red-Blue Graph

dp, graphs, math, matrices, meet-in-the-middle

Olympic Team Building

brute force, meet-in-the-middle