Non-Decreasing Dilemma

data structures, divide and conquer, math

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

Carrying Conundrum

bitmasks, combinatorics, dp, math

MEXor Mixup

bitmasks, greedy

Domino Disaster

implementation, strings

Xor-quiz

constructive algorithms, dp, interactive, math, number theory

Four Vertices

constructive algorithms, data structures, graphs, greedy, implementation, shortest paths

Points Movement

data structures, dp, greedy, implementation, sortings

Buds Re-hanging

constructive algorithms, dfs and similar, dp, greedy, trees

Seating Arrangements (hard version)

data structures, greedy, implementation, sortings, two pointers

Seating Arrangements (easy version)

data structures, greedy, sortings

MAX-MEX Cut

bitmasks, constructive algorithms, dp, greedy

MIN-MEX Cut

bitmasks, constructive algorithms, dp, greedy

Median Maximization

binary search, greedy, math

Tubular Bells

interactive, math, number theory, probabilities

Rescue Niwen!

dp, greedy, string suffix structures, strings

Two Hundred Twenty One (hard version)

data structures, math

Two Hundred Twenty One (easy version)

data structures, dp, math

Rings

constructive algorithms, math

Scenes From a Memory

brute force, constructive algorithms, implementation, math, number theory

The Miracle and the Sleeper

greedy, math

Up the Strip (simplified version)

brute force, data structures, dp, math, number theory

Deep Down Below

binary search, greedy, sortings

Simply Strange Sort

brute force, implementation, sortings

Nearest Beautiful Number (hard version)

bitmasks, brute force, constructive algorithms, dfs and similar, dp, greedy

Nearest Beautiful Number (easy version)

binary search, bitmasks, brute force, constructive algorithms, dfs and similar, greedy

Polycarp and String Transformation

binary search, implementation, sortings, strings

Make a Power of Two

greedy, math, strings

Infinity Table

implementation, math

Who's Opposite?

math

Dislike of Threes

implementation

Mocha and Stars

combinatorics, dp, fft, math, number theory

Mocha and Diana (Hard Version)

brute force, constructive algorithms, dfs and similar, dsu, graphs, greedy, trees, two pointers

Mocha and Diana (Easy Version)

brute force, constructive algorithms, dsu, graphs, greedy, trees

Mocha and Hiking

constructive algorithms, graphs

Mocha and Red and Blue

dp, greedy

Mocha and Math

bitmasks, constructive algorithms, math

Strange Sort

data structures, sortings

Down Below

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

Top-Notch Insertions

combinatorics, data structures

Bottom-Tier Reversals

constructive algorithms, greedy

Up the Strip

brute force, dp, math, number theory, two pointers

Charmed by the Game

brute force, math

Assiut Chess

brute force, constructive algorithms, interactive

Ezzat and Grid

data structures, dp, greedy

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Moamen and k-subarrays

greedy, sortings

Ezzat and Two Subsequences

brute force, math, sortings

DIY Tree

graphs, greedy, math, probabilities

Gates to Another World

bitmasks, data structures, dsu, two pointers

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Equilibrium

data structures, dp, greedy

Take a Guess

bitmasks, constructive algorithms, interactive, math

Compressed Bracket Sequence

brute force, implementation

Take Your Places!

implementation

A Variety of Operations

math

Good Graph

data structures, dsu, graphs, trees

Boring Segments

data structures, sortings, trees, two pointers

Say No to Palindromes

brute force, constructive algorithms, dp, strings

Coin Rows

brute force, constructive algorithms, dp, implementation

Two Tables

brute force

PizzaForces

brute force, math

You

dfs and similar, dp, math, number theory

Diane

constructive algorithms, greedy, strings

Mikasa

binary search, bitmasks, greedy, implementation

Cobb

bitmasks, brute force, greedy, math

Cherry

greedy

Stairs

combinatorics, divide and conquer, dp, fft, math

XOR and Distance

bitmasks, divide and conquer, trees

Common Divisor Graph

brute force, constructive algorithms, dsu, graphs, hashing, math, number theory

Pairwise Modulo

data structures, math

Permutation Shift

brute force, combinatorics, constructive algorithms, dfs and similar, dsu, graphs, math

Backspace

dp, greedy, strings, two pointers

Penalty

bitmasks, brute force, dp, greedy

Reverse String

brute force, dp, hashing, implementation, strings

Digits Sum

math, number theory

Organizing a Music Festival

dfs and similar, math

Guess the Perimeter

binary search, interactive, number theory

A Serious Referee

bitmasks, brute force, dfs and similar, sortings

Telepanting

binary search, data structures, dp, sortings

Colors and Intervals

constructive algorithms, data structures, greedy, sortings

Array Differentiation

bitmasks, brute force, constructive algorithms, dfs and similar, dp, graphs, math

Maximize the Intersections

combinatorics, constructive algorithms, geometry, greedy, sortings

Running for Gold

combinatorics, graphs, greedy, sortings

Subsequence Permutation

sortings, strings

Equidistant Vertices

brute force, combinatorics, dfs and similar, dp, trees

Fixed Points

binary search, brute force, dp

Domino (hard version)

constructive algorithms, implementation, math

Domino (easy version)

constructive algorithms, math

Interesting Story

greedy, sortings, strings

Wonderful Coloring - 2

binary search, constructive algorithms, data structures, greedy

Wonderful Coloring - 1

greedy, strings

Polycarp and Coins

greedy, math

Jumping Around

binary search, data structures, divide and conquer, dp, dsu, graphs, shortest paths

Stringforces

binary search, bitmasks, brute force, dp, strings, two pointers

Excellent Arrays

binary search, combinatorics, constructive algorithms, implementation, math, sortings, two pointers

Manhattan Subarrays

brute force, geometry, greedy, implementation

Maximum Cost Deletion

greedy, math

Find The Array

greedy, math

Gregor and the Pawn Game

dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation