LEGOndary Grandmaster

combinatorics, dp, math

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

Tree Coloring

combinatorics, divide and conquer, fft

Max Sum Array

combinatorics, constructive algorithms, greedy, sortings

Not Quite Lee

combinatorics, dp, math, number theory

MEX counting

combinatorics, dp, implementation

Dominoes

combinatorics, fft, graphs, math, number theory

Arena

combinatorics, dp, math

PalindORme

combinatorics, dp

October 18, 2017

combinatorics, dp, implementation, math

A Perfect Problem

combinatorics, dp, math

Bubble Strike

combinatorics, math, probabilities, ternary search

Staircases

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

Training Session

combinatorics, data structures, geometry, implementation, math

Rubik's Cube Coloring (easy version)

combinatorics, math

Omkar and Mosaic

combinatorics, constructive algorithms, math

Non-equal Neighbours

combinatorics, dp, math

Guess the Permutation

binary search, combinatorics, interactive, math

Luntik and Subsequences

combinatorics, math

CQXYM Count Permutations

combinatorics, math, number theory

Problems for Codeforces

combinatorics, fft, math

Mathematics Curriculum

brute force, combinatorics, dp, trees

Occurrences

combinatorics, dfs and similar, dp, dsu, fft, graphs

Coloring

combinatorics, constructive algorithms, implementation, math

Combinatorics Homework

combinatorics, greedy, math

Jury Meeting

combinatorics, math

Carrying Conundrum

bitmasks, combinatorics, dp, math

Mocha and Stars

combinatorics, dp, fft, math, number theory

Top-Notch Insertions

combinatorics, data structures

Moamen and XOR

bitmasks, combinatorics, dp, math, matrices

Sports Betting

bitmasks, combinatorics, dp, graphs, math, probabilities

Stairs

combinatorics, divide and conquer, dp, fft, math

Permutation Shift

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

Maximize the Intersections

combinatorics, constructive algorithms, geometry, greedy, sortings

Running for Gold

combinatorics, graphs, greedy, sortings

Equidistant Vertices

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

Excellent Arrays

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

The Three Little Pigs

combinatorics, dp, fft, math

AquaMoon and Permutations

2-sat, brute force, combinatorics, constructive algorithms, graph matchings, graphs

AquaMoon and Chess

combinatorics, math

Customising the Track

combinatorics, greedy, math

Abnormal Permutation Pairs (hard version)

combinatorics, dp, fft, math

Abnormal Permutation Pairs (easy version)

combinatorics, dp, fft, math

Priority Queue

combinatorics, dp, implementation, math, ternary search

Tree Array

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

Contest Start

combinatorics, geometry, greedy, math

Omkar and Akmar

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

Omkar and Forest

combinatorics, graphs, math, shortest paths

Little Alawn's Puzzle

combinatorics, dp, dsu, graphs, math

Bingo

bitmasks, combinatorics, dp, math, probabilities

AmShZ Farm

combinatorics, fft, math

Mashtali and Hagh Trees

combinatorics, dp, trees

Kavi on Pairing Duty

combinatorics, dp, math

MEX Tree

combinatorics, dfs and similar, implementation, math, trees

Oolimry and Suffix Array

combinatorics, constructive algorithms, math

Assimilation IV

combinatorics, dp, math, probabilities, two pointers

Crypto Lights

combinatorics, dp, math, probabilities

Reunion

combinatorics, dp, trees

Baby Ehab Plays with Permutations

combinatorics, dp, math

Phoenix and Computers

combinatorics, dp, math

AND 0, Sum Big

bitmasks, combinatorics, math

Cost Equilibrium

combinatorics, constructive algorithms, math, sortings

AND Sequences

bitmasks, combinatorics, constructive algorithms, math

Colorings and Dominoes

combinatorics, dp, greedy, math

Almost Sorted

binary search, combinatorics, constructive algorithms, implementation

2-Coloring

combinatorics, dp, math

Diameter Cuts

combinatorics, dfs and similar, dp, trees

Chaotic Merge

combinatorics, dp, math, strings

Domino on Windowsill

combinatorics, constructive algorithms, math

BFS Trees

combinatorics, dfs and similar, graphs, math, shortest paths, trees

Build From Suffixes

*special problem, combinatorics, data structures

String Counting

combinatorics, dp, fft, math

Pairs of Paths

combinatorics, data structures, dfs and similar, dp, trees

Copy or Prefix Sum

combinatorics, data structures, dp, sortings

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

Advertising Agency

combinatorics, math, sortings

Ball in Berland

combinatorics, graphs, math

Tiles

combinatorics, dp, fft, math

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Sum of Paths

combinatorics, dp, math

Finding satisfactory solutions

combinatorics, dp, graphs, greedy, math

Song of the Sirens

combinatorics, divide and conquer, hashing, math, string suffix structures, strings

Close Tuples (hard version)

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

Close Tuples (easy version)

binary search, combinatorics, math, sortings, two pointers

Number of Simple Paths

combinatorics, dfs and similar, graphs, trees

Radio Towers

combinatorics, dp, math

Multithreading (Hard Version)

combinatorics, implementation, math

Multithreading (Easy Version)

combinatorics, fft, math

Divide and Sum

combinatorics, math, sortings

Identify the Operations

combinatorics, data structures, dsu, greedy, implementation

INOI Final Contests

combinatorics, dp, fft

Emotional Fishermen

combinatorics, dp, math, two pointers

Sum Over Subsets

combinatorics, math, number theory

Binary Search

binary search, combinatorics

Two Round Dances

combinatorics, math

Number of Subsequences

combinatorics, dp, strings

Danger of Mad Snakes

combinatorics, dp, math

Bargain

combinatorics, dp, math

Rescue Nibel!

combinatorics, data structures, sortings

Expected Damage

binary search, combinatorics, probabilities