Grid Xor

constructive algorithms, greedy, implementation, interactive, math

Not Escaping

data structures, dp, implementation, shortest paths, two pointers

Martial Arts Tournament

binary search, brute force, greedy, math

Binary Spiders

bitmasks, data structures, implementation, math, sortings, trees

Robot Cleaner Revisit

implementation, math, probabilities

Math Test

bitmasks, brute force, greedy

New School

binary search, data structures, dp, greedy, implementation, sortings

The Winter Hike

constructive algorithms, greedy, math

Trader Problem

data structures, dsu, greedy, sortings

Lexicographically Small Enough

brute force, data structures, greedy, strings

X(or)-mas Tree

bitmasks, dfs and similar, dsu, graphs, trees

Divan and Kostomuksha (hard version)

dp, number theory

Divan and Kostomuksha (easy version)

dp, number theory

AmShZ and G.O.A.T.

binary search, brute force, greedy, implementation, math

Banquet Preparations 2

greedy, sortings, two pointers

Banquet Preparations 1

greedy

Robot on the Board 2

brute force, dfs and similar, graphs, implementation

Arena

combinatorics, dp, math

Treelabeling

bitmasks, constructive algorithms, dfs and similar, games, greedy, implementation, trees

Extreme Extension

dp, greedy, math, number theory

Optimal Insertion

data structures, divide and conquer, dp, greedy, sortings

Party Organization

brute force, math, probabilities

Hidden Fortress

interactive, math

Staircases

brute force, combinatorics, data structures, dfs and similar, dp, implementation, math

Rubik's Cube Coloring (hard version)

brute force, dp, implementation, math, trees

Changing Brackets

constructive algorithms, data structures, dp, greedy

Red-Black Number

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

Hemose in ICPC ?

binary search, dfs and similar, implementation, interactive, math, number theory, trees

Game with Stones

binary search, data structures, games, greedy

Moment of Bloom

constructive algorithms, dfs and similar, graph matchings, graphs, greedy, trees

Train Maintenance

brute force, data structures, implementation

Minimal Coverage

dp

Longest Array Deconstruction

data structures, divide and conquer, dp, sortings

Knitting Batik

implementation, math

Illusions of the Desert

data structures, trees

Holiday Wall Ornaments

dp, strings

GCD Festival

math, number theory

Building an Amusement Park

binary search, geometry

Non-Decreasing Dilemma

data structures, divide and conquer, math

Two Hundred Twenty One (hard version)

data structures, math

Nearest Beautiful Number (hard version)

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

Mocha and Stars

combinatorics, dp, fft, math, number theory

Ezzat and Grid

data structures, dp, greedy

Equilibrium

data structures, dp, greedy

Boring Segments

data structures, sortings, trees, two pointers

Pairwise Modulo

data structures, math

Permutation Shift

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

Telepanting

binary search, data structures, dp, sortings

Colors and Intervals

constructive algorithms, data structures, greedy, sortings

Equidistant Vertices

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

Domino (hard version)

constructive algorithms, implementation, math

Excellent Arrays

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

Gregor and the Odd Cows (Easy)

bitmasks, geometry, math, number theory

How Many Paths?

dfs and similar, dp, graphs, trees

RPD and Rap Sheet (Hard Version)

brute force, constructive algorithms, interactive, math

Priority Queue

combinatorics, dp, implementation, math, ternary search

Tree Array

brute force, combinatorics, dp, graphs, math, probabilities, trees

Gift Set

binary search, greedy, math, ternary search

Funny Substrings

data structures, hashing, implementation, matrices, strings

Figure Fixing

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

Erase and Extend (Hard Version)

binary search, data structures, greedy, hashing, string suffix structures, strings, two pointers

Omkar and Forest

combinatorics, graphs, math, shortest paths

Gold Transfer

binary search, data structures, dp, greedy, interactive, trees

Lost Array

graphs, greedy, interactive, shortest paths

Minimax

constructive algorithms, greedy, strings

Trees of Tranquillity

data structures, dfs and similar, greedy, trees

Kill Anton

brute force, constructive algorithms, data structures, math, strings

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

To Go Or Not To Go?

brute force, dfs and similar, graphs, greedy, implementation, shortest paths

Guess the K-th Zero (Hard version)

binary search, constructive algorithms, data structures, interactive

Cut

binary search, data structures, dp, graphs, number theory, two pointers

Phoenix and Computers

combinatorics, dp, math

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

Colorings and Dominoes

combinatorics, dp, greedy, math

Guide

Digits

dp, math, number theory

Mysterious language again, seriously?

*special problem

Math

*special problem, math

Travelling Salesman Problem

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

Two chandeliers

binary search, brute force, chinese remainder theorem, math, number theory

The Number of Pairs

dp, math, number theory

Two Houses

brute force, graphs, greedy, interactive, sortings

Bananas in a Microwave

dfs and similar, dp, graphs, implementation

Garden of the Sun

constructive algorithms, graphs

Dogeforces

constructive algorithms, data structures, dfs and similar, divide and conquer, dsu, greedy, sortings, trees

GCD of an Array

brute force, data structures, hashing, implementation, math, number theory, sortings, two pointers

Dogecoin

*special problem, *special problem, binary search, data structures

Palindromic Doubles

*special problem, data structures, dp

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Max Median

binary search, data structures, dp

Multiples and Power Differences

constructive algorithms, graphs, math, number theory

Skyline Photo

data structures, divide and conquer, dp

Painting the Array II

constructive algorithms, data structures, dp, greedy, implementation

Nezzar and Nice Beatmap

constructive algorithms, geometry, greedy, math, sortings

Pattern Matching

bitmasks, data structures, dfs and similar, graphs, hashing, sortings, strings

Cleaning

data structures, dp, greedy, math

Moving to the Capital

dfs and similar, dp, graphs, shortest paths

New Year's Puzzle

brute force, dp, graph matchings, greedy, sortings

Strange Housing

constructive algorithms, dfs and similar, graph matchings, graphs, greedy

Similar Sets

data structures, graphs, implementation