Novice's Mistake

brute force, constructive algorithms, math, strings

Only Pluses

brute force, constructive algorithms, greedy, math, sortings

Smithing Skill

brute force, data structures, dp, greedy, math, sortings, two pointers

Substring and Subsequence

brute force, greedy, strings

Wonderful Tree!

brute force, data structures, dfs and similar, dsu, greedy, trees

Permutation Problem (Hard Version)

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

Permutation Problem (Simple Version)

binary search, brute force, combinatorics, data structures, math, number theory

Mathematical Problem

brute force, dp, greedy, implementation, math, two pointers

Matrix Stabilization

brute force, data structures, greedy, sortings

X Axis

brute force, geometry, math, sortings

Maximize the Largest Component (Easy Version)

brute force, data structures, dfs and similar, dsu, graphs, implementation

Secret Box

brute force, combinatorics, math

Maximum Multiple Sum

brute force, math, number theory

Reconstruction

brute force, dp, math

''a'' String Problem

brute force, hashing, implementation, math, string suffix structures, strings

Your Loss

bitmasks, brute force, dp, trees

Have Your Cake and Eat It Too

binary search, brute force, greedy, implementation

Number of k-good subarrays

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

Beauty of the mountains

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

Collatz Conjecture

brute force, implementation, math, number theory

Turtle and an Incomplete Sequence

bitmasks, brute force, constructive algorithms, greedy, implementation, math

Turtle and Piggy Are Playing a Game

brute force, greedy, math

Kostyanych's Theorem

brute force, constructive algorithms, graphs, interactive

Fixing a Binary String

bitmasks, brute force, constructive algorithms, dp, greedy, hashing, strings

Guess the Maximum

brute force, greedy, implementation

Computing Machine

brute force, data structures, dp, greedy, implementation

XORificator

bitmasks, brute force, greedy, hashing

Nikita and LCM

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

Set

bitmasks, brute force, combinatorics, dfs and similar, divide and conquer, dp, math

Paint the Tree

brute force, dfs and similar, dp, greedy, shortest paths, trees

Chamo and Mocha's Array

binary search, brute force, greedy

378QAQ and Mocha's Array

brute force, greedy, math, sortings

Bazoka and Mocha's Array

brute force, greedy, implementation, sortings

Cutting Game

binary search, brute force, data structures, implementation, sortings, two pointers

Maximum GCD Sum Queries

bitmasks, brute force, dp, implementation, number theory

Cat, Fox and Maximum Array Split

brute force, interactive, math

Chess For Three

brute force, dp, implementation, math

Contest Proposal

brute force, greedy, two pointers

Circle Perimeter

binary search, brute force, dfs and similar, geometry, implementation, math

Min-Fund Prison (Medium)

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

Arithmancy (Easy)

brute force, constructive algorithms, interactive, strings

Balanced Unshuffle (Medium)

brute force, constructive algorithms, trees

Division + LCP (hard version)

binary search, brute force, data structures, dp, hashing, math, string suffix structures, strings

Permutation Game

brute force, dfs and similar, games, graphs, greedy, math

Maximize?

brute force, math, number theory

Next and Prev

brute force, data structures, implementation

Fenwick Tree

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

Reverse Card (Hard Version)

brute force, math, number theory

Reverse Card (Easy Version)

brute force, math, number theory

Carousel of Combinations

brute force, combinatorics, dp, math, number theory

A BIT of an Inequality

bitmasks, brute force, dp, math

Nene vs. Monsters (Hard Version)

brute force, greedy, implementation, math

Nene vs. Monsters (Easy Version)

brute force, implementation, math

Nene and the Mex Operator

bitmasks, brute force, constructive algorithms, divide and conquer, dp, greedy, implementation, math

Nene's Game

binary search, brute force, data structures, games, greedy

The Most Reckless Defense

bitmasks, brute force, constructive algorithms, dp, flows, graph matchings, shortest paths

GCD on a grid

brute force, dfs and similar, dp, implementation, math, number theory

Long Inversions

brute force, greedy, implementation, sortings

Help, what does it mean to be "Based"

brute force, constructive algorithms, expression parsing, implementation, sortings

Grid

brute force

They Have Fooled

brute force, schedules

No Palindromes

brute force, constructive algorithms, divide and conquer, greedy, hashing, implementation, math, strings

0, 1, 2, Tree!

bitmasks, brute force, greedy, implementation, trees

Nearly Shortest Repeating Substring

brute force, implementation, number theory, strings

Product of Binary Decimals

brute force, dp, implementation, number theory

Damage per Second

brute force, math

Charming Meals

binary search, brute force, greedy, sortings

Grove

brute force, dfs and similar, dp, geometry, probabilities

MST with Matching

bitmasks, brute force, dsu, graph matchings, trees

Clique Partition

brute force, constructive algorithms, graphs, greedy, implementation

Tandem Repeats?

brute force, strings, two pointers

Arrow Path

brute force, constructive algorithms, dfs and similar, dp, graphs, shortest paths

Array Fix

brute force, dp, greedy, implementation

Special Characters

brute force, constructive algorithms

Birthday Gift

bitmasks, brute force, constructive algorithms, greedy, implementation

GCD is Greater

brute force, data structures, math, number theory

Left and Right Houses

brute force

MEX Game 2 (Easy Version)

binary search, brute force, greedy

Counting Is Fun (Easy Version)

brute force, combinatorics, dp, math

Farmer John's Favorite Function

brute force, data structures, implementation, math

Rudolf and 121

brute force, dp, greedy, math

Rudolf and the Ticket

brute force, math

Distance Learning Courses in MAC

bitmasks, brute force, data structures, greedy, math

Messenger in MAC

binary search, brute force, constructive algorithms, data structures, dp, greedy, sortings

Weird LCM Operations

brute force, constructive algorithms, number theory

Yet Another Coin Problem

brute force, dp, greedy, math

Turtle Magic: Royal Turtle Shell Pattern

bitmasks, brute force, combinatorics, constructive algorithms, dfs and similar, math

Turtle Fingers: Count the Values of k

brute force, implementation, math, number theory

LR-remainders

brute force, data structures, implementation, math, two pointers

Make Equal Again

brute force, greedy, math

Recovering a Small String

brute force, strings

Maximize the Difference

bitmasks, brute force, dfs and similar

Sum over all Substrings (Easy Version)

brute force, dp, greedy, strings

Permutation Printing

brute force, constructive algorithms, math

Sasha and the Wedding Binary Search Tree

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

Sasha and the Happy Tree Cutting

bitmasks, brute force, dfs and similar, dp, graphs, greedy, math, trees

Sasha and the Casino

binary search, brute force, constructive algorithms, games, greedy, math

Modular Sequence

brute force, constructive algorithms, dp, graphs, greedy, math, number theory

Lonely Mountain Dungeons

brute force, data structures, greedy, math, ternary search

Physical Education Lesson

brute force, math, number theory