Keep XOR Low

bitmasks, combinatorics, data structures, divide and conquer, dp, math

Tricolor Triangles

brute force, graphs, math, matrices

Keep the Average High

dp, greedy, math

Representative Edges

brute force, geometry, implementation, math

LEGOndary Grandmaster

combinatorics, dp, math

Purple Crayon

data structures, dfs and similar, games, graphs, greedy, math, sortings, trees

Menorah

brute force, graphs, greedy, math

And It's Non-Zero

bitmasks, greedy, math

Closing The Gap

greedy, math

Divan and bitwise operations

bitmasks, combinatorics, constructive algorithms, dp, math

MEX Sequences

dp, math

Long Comparison

implementation, math

X-Magic Pair

math, number theory

Chat Ban

binary search, math

Team Composition: Programmers and Mathematicians

binary search, constructive algorithms, math

Make Even

constructive algorithms, math

AmShZ and G.O.A.T.

binary search, brute force, greedy, implementation, math

Not Quite Lee

combinatorics, dp, math, number theory

Anti Light's Cell Guessing

math

A Stroll Around the Matrix

data structures, greedy, math

Divide and Multiply

greedy, implementation, math, number theory

Dominoes

combinatorics, fft, graphs, math, number theory

Find Array

constructive algorithms, math

Blue-Red Permutation

greedy, math, sortings

Odd Grasshopper

math

Arena

combinatorics, dp, math

Update Files

greedy, implementation, math

Array Equalizer

binary search, greedy, implementation, math, number theory, sortings, two pointers

A.M. Deviation

math, number theory

October 18, 2017

combinatorics, dp, implementation, math

A Perfect Problem

combinatorics, dp, math

Extreme Extension

dp, greedy, math, number theory

Moderate Modular Mode

constructive algorithms, math, number theory

Di-visible Confusion

constructive algorithms, math, number theory

Two Sorts

binary search, dfs and similar, math, meet-in-the-middle

Array Elimination

bitmasks, greedy, math, number theory

Party Organization

brute force, math, probabilities

Hidden Fortress

interactive, math

Shortest path

brute force, geometry, math, shortest paths

Bubble Strike

combinatorics, math, probabilities, ternary search

The Sum of Good Numbers

hashing, math, string suffix structures, strings

Staircases

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

Training Session

combinatorics, data structures, geometry, implementation, math

Delete Two Elements

data structures, dp, implementation, math, two pointers

Ideal Farm

constructive algorithms, math

Rubik's Cube Coloring (hard version)

brute force, dp, implementation, math, trees

Rubik's Cube Coloring (easy version)

combinatorics, math

Make Them Equal

brute force, greedy, math, strings

Special Numbers

bitmasks, math

Consecutive Sum Riddle

math

Red-Black Number

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

Half of Same

brute force, math, number theory

All are Same

math, number theory

Make it Divisible by 25

dfs and similar, dp, greedy, math, math

Elections

math

Bored Bakry

bitmasks, greedy, math, two pointers

Hemose in ICPC ?

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

Hemose Shopping

constructive algorithms, dsu, math, sortings

Gamer Hemose

binary search, greedy, math, sortings

Omkar and Mosaic

combinatorics, constructive algorithms, math

Non-equal Neighbours

combinatorics, dp, math

Yet Another Sorting Problem

data structures, math

Guess the Permutation

binary search, combinatorics, interactive, math

Two Arrays

greedy, math, sortings

Coloring Rectangles

greedy, math

Mathematical Addition

math

Omkar and Time Travel

data structures, math

Windblume Ode

math, number theory

Pchelyonok and Segments

binary search, data structures, dp, greedy, math

Vupsen, Pupsen and 0

constructive algorithms, math

Luntik and Subsequences

combinatorics, math

Luntik and Concerts

math

Diameter of Graph

constructive algorithms, graphs, greedy, math

CQXYM Count Permutations

combinatorics, math, number theory

Problems for Codeforces

combinatorics, fft, math

Array Stabilization (AND version)

brute force, graphs, math, number theory, shortest paths

Permutation Minimization by Deque

constructive algorithms, greedy, math

Casimir's String Solitaire

math, strings

Game of Chance

math, probabilities

Easy Scheduling

implementation, math

Knitting Batik

implementation, math

GCD Festival

math, number theory

Finding Expected Value

math

Coloring

combinatorics, constructive algorithms, implementation, math

Combinatorics Homework

combinatorics, greedy, math

Swaps

greedy, math, sortings

Sweepstake

*special problem, brute force, constructive algorithms, implementation, math

Epic Novel

*special problem, math

Jury Meeting

combinatorics, math

Non-Decreasing Dilemma

data structures, divide and conquer, math

Expression Evaluation Error

constructive algorithms, greedy, implementation, math

Carrying Conundrum

bitmasks, combinatorics, dp, math

Xor-quiz

constructive algorithms, dp, interactive, math, number theory

Median Maximization

binary search, greedy, math

Tubular Bells

interactive, math, number theory, probabilities

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