Captain Marmot

brute force, geometry

More Wrong

divide and conquer, interactive

Terse princess

constructive algorithms, greedy

Bracket Walk

data structures, greedy, strings

Grid Xor

constructive algorithms, greedy, implementation, interactive, math

Connect the Points

brute force, constructive algorithms, geometry

Fox and Card Game

games, greedy, sortings

Tanya and Password

dfs and similar, graphs

Generating Sets

binary search, data structures, dfs and similar, greedy, strings, trees

Foe Pairs

combinatorics, sortings, two pointers

Toy Sum

greedy, implementation, math

Island Puzzle

constructive algorithms, implementation

Restructuring Company

data structures, dsu

Volatile Kite

geometry

Thanos Nim

games

Pillars

binary search, data structures, dp, sortings, trees

Triangular Paths

constructive algorithms, graphs, math, shortest paths, sortings

Well-known Numbers

binary search, greedy, number theory

GCD on a grid

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

Lucky Permutation

constructive algorithms, math

About Bacteria

implementation, math

Spanning Tree with One Fixed Degree

constructive algorithms, dfs and similar, dsu, graphs, greedy

Shortest Path

graphs, shortest paths

Calendar Ambiguity

math, number theory

Magic Five

combinatorics, math

Colored Rooks

constructive algorithms, graphs

Numbers Joke

*special problem

Common Number

binary search, combinatorics, dp, math

Vanya and Computer Game

binary search, implementation, math, sortings

Statues

dfs and similar

Missing Subsequence Sum

constructive algorithms, greedy, number theory

Count Paths

data structures, dfs and similar, dp, dsu, graphs, trees

...And after happily lived ever they

*special problem, bitmasks

The Child and Zoo

dsu, sortings

Willem, Chtholly and Seniorious

data structures, probabilities

Yet Another Array Queries Problem

data structures, implementation

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

Decryption

constructive algorithms, implementation, math, number theory

Bear and Two Paths

constructive algorithms, graphs

Animals

dp, greedy

Correct Bracket Sequence Editor

data structures, dsu, strings

Bottom-Tier Reversals

constructive algorithms, greedy

As Fast As Possible

binary search, math

A BIT of an Inequality

bitmasks, brute force, dp, math

Bottles

dp

Linguistics

greedy, implementation, sortings, strings

Enduring Exodus

binary search, two pointers

Non-Palindromic Substring

hashing, implementation, math, strings

Bookshelves

bitmasks, dp, greedy

Circular Spanning Tree

constructive algorithms, implementation, trees

Interacdive Problem

binary search, constructive algorithms, interactive

Game with modulo

binary search, constructive algorithms, interactive

Alyona and Strings

dp, strings

DZY Loves Fibonacci Numbers

data structures, math, number theory

Suitable Replacement

binary search, greedy, implementation

Best Pair

binary search, brute force, implementation

Peter and Snow Blower

binary search, geometry, ternary search

Minimal Segment Cover

data structures, dfs and similar, divide and conquer, dp, greedy, implementation, trees

Bets

greedy, implementation

Cats Transport

data structures, dp

Lucky Tree

dp, dsu, trees

Good Trip

combinatorics, dp, math, probabilities

Lost Arithmetic Progression

combinatorics, math, number theory

Replacing Digits

greedy

Recover the String

constructive algorithms, greedy, implementation, math

Nash Matrix

constructive algorithms, dfs and similar, graphs, implementation

Party

constructive algorithms, graphs, math

Travelling Salesman Problem

binary search, data structures, dp, greedy, shortest paths, sortings, two pointers

Simple Subset

constructive algorithms, greedy, number theory

Holidays

implementation

Kamil and Making a Stream

math, number theory, trees

Music Festival

binary search, data structures, dp, greedy, sortings

Score of a Tree

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

Vladik and Memorable Trip

dp, implementation

Letter Exchange

constructive algorithms

Facetook Priority Wall

expression parsing, implementation, strings

Strange Game On Matrix

greedy, two pointers

Hills

dp

Train Splitting

constructive algorithms, graphs, greedy

Vitya and Strange Lesson

binary search, data structures

Cookies

math

Devu and Flowers

bitmasks, combinatorics, number theory

Alternating Sum

math, number theory

Mishap in Club

greedy, implementation

Count the Trains

binary search, data structures, greedy, sortings

Points on Plane

constructive algorithms, divide and conquer, geometry, greedy, sortings

Cycle in Graph

dfs and similar, graphs

Inna and Nine

combinatorics, greedy

Permutation Shift

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

News About Credit

*special problem, greedy, two pointers

Omkar and Duck

bitmasks, constructive algorithms, interactive, math

Road to Post Office

math

Regular Bridge

constructive algorithms, graphs, implementation

Looking for Order

bitmasks, dp

Pencils and Boxes

binary search, data structures, dp, greedy, two pointers

Rebus

constructive algorithms, expression parsing, greedy, math

Matching vs Independent Set

constructive algorithms, graphs, greedy, sortings

Power Transmission (Easy Edition)

brute force, geometry

Complete the Projects (easy version)

greedy

Game on Axis

combinatorics, dfs and similar, dsu, graphs, implementation