Isaac's Queries

bitmasks, brute force, constructive algorithms, dfs and similar, divide and conquer, dp, greedy, interactive, math, probabilities

Adjusting Drones

binary search, brute force, data structures, dp, dsu, greedy, implementation, sortings

Best Time to Buy and Sell Stock

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

Bombing (Hard Version)

combinatorics, dp

Not Alone

dp, greedy

Victorious Coloring (Easy Version)

dfs and similar, dp, greedy

Attraction Theory

combinatorics, dp, math

Limited Edition Shop

data structures, dp

Rabbits

constructive algorithms, dp, greedy, implementation

Bubble Sort

brute force, combinatorics, dp

Cost of Coloring

combinatorics, divide and conquer, dp, fft, math

Long Journey

dfs and similar, divide and conquer, dp, graphs, greedy, math, matrices, number theory

Inversion Value of a Permutation

constructive algorithms, dfs and similar, dp

Bracket Groups

brute force, constructive algorithms, dp, string suffix structures, strings

Looking at Towers (difficult version)

combinatorics, data structures, dp

Looking at Towers (easy version)

combinatorics, dp

Price Tags

brute force, dp, math

Non-Descending Arrays

combinatorics, dp, math

Inversion Graph Coloring (Hard Version)

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

Inversion Graph Coloring (Easy Version)

combinatorics, data structures, dp, greedy, two pointers

Perfect Cut

*special problem, dp, greedy

Prime Gaming (Hard Version)

bitmasks, combinatorics, dp, probabilities

Prime Gaming (Easy Version)

bitmasks, combinatorics, dp

Maple and Tree Beauty (Hard Version)

bitmasks, brute force, dfs and similar, dp, fft, trees

Maple and Tree Beauty (Easy Version)

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

Cry Me a River

dfs and similar, dp, games, graphs

Beyond the Palindrome (Hard Version)

combinatorics, dp, math, number theory

Beyond the Palindrome (Easy Version)

combinatorics, dp, math

Against the Difference

data structures, dp

Permutation Oddness

combinatorics, dp, math

Power Boxes

constructive algorithms, dp, implementation, interactive

Flint and Steel

data structures, dp, graphs

I Yearned For The Mines

constructive algorithms, dfs and similar, dp, greedy, trees

Chicken Jockey

dp, greedy

From 1 to Infinity

binary search, dp, implementation, math

Wafu!

bitmasks, brute force, data structures, dfs and similar, dp, math

Permutation Blackhole

brute force, combinatorics, dp, implementation, math

Interactive RBS (Hard Version)

binary search, bitmasks, constructive algorithms, dp, interactive

Stay or Mirror

brute force, data structures, dp, greedy, sortings

Double Perspective

constructive algorithms, dp, dsu, graphs, greedy, sortings

Submedians (Easy Version)

binary search, data structures, dp, greedy, math

Sum of LDS

brute force, combinatorics, dp, greedy, math

23 Rises Again

brute force, dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation, probabilities, trees

Hamed and AghaBalaSar

brute force, combinatorics, dp, math, probabilities

Big Wins! (easy version)

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

No Casino in the Mountains

dp, greedy

Timofey and Docker

binary search, divide and conquer, dp

Sets of Complementary Sums

brute force, combinatorics, dp, math, two pointers

Segments Covering

dp, math, probabilities

Longest Good Subsequence

dp, math, trees

Appending Permutations (Hard Version)

combinatorics, dp

Appending Permutations (Easy Version)

combinatorics, dp

Greedy Grid Counting

combinatorics, dp, greedy, math

Traffic Lights

brute force, data structures, divide and conquer, dp, graphs, greedy, shortest paths

Ice Baby

binary search, brute force, data structures, dp, implementation, sortings

Sponsor of Your Problems

dp, greedy, implementation, strings

Lanes of Cars

binary search, dp, ternary search

Volcanic Eruptions

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

And Constraint

bitmasks, dp, greedy

Token Removing

combinatorics, dp, math

Red Light, Green Light (Hard version)

binary search, brute force, data structures, dfs and similar, dp, graphs, implementation, math, number theory

Red Light, Green Light (Easy version)

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

Gellyfish and Mayflower

dp, graphs

Gellyfish and Forget-Me-Not

bitmasks, dp, games, greedy, math

Gellyfish and Eternal Violet

combinatorics, dp, greedy, math, probabilities

Gellyfish and Camellia Japonica

brute force, constructive algorithms, dfs and similar, dp, graphs, greedy, trees

Gellyfish and Flaming Peony

constructive algorithms, dp, math, number theory

Build an Array

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

Small Operations

binary search, brute force, dfs and similar, dp, math, number theory, sortings

Kirei Attacks the Estate

dfs and similar, dp, greedy, trees

Need More Arrays

dp, greedy

Tree Colorings

combinatorics, dfs and similar, dp, graphs, math, number theory, trees

Fibonacci Cubes

brute force, dp, implementation, math

Fewer Batteries

binary search, dfs and similar, dp, graphs, greedy, hashing

Binary String Wowee

combinatorics, dp, strings

Neo's Escape

binary search, brute force, data structures, dp, dsu, graphs, greedy, implementation

Cycling (Hard Version)

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

Cycling (Easy Version)

binary search, brute force, dp, greedy

Maximum Subarray Sum

binary search, constructive algorithms, dp, implementation, math

Goblin

dfs and similar, dp, dsu, greedy, math

Flower Boy

binary search, dp, greedy, two pointers

Numbers and Strings

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

Unpleasant Strings

binary search, dp, greedy, strings

Move to the End

brute force, data structures, dp, greedy, implementation

Maximize Nor

bitmasks, data structures, dp, implementation, sortings

Shoo Shatters the Sunshine

combinatorics, dp, trees

Kia Bakes a Cake

data structures, dp, greedy, trees

Lost Luggage

dp, flows

Clearing the Snowdrift

data structures, dfs and similar, dp, greedy

Baggage Claim

combinatorics, dfs and similar, dp, dsu, graphs, implementation, math, trees

Wonderful XOR Problem

bitmasks, combinatorics, dp, fft, math

Wonderful City

dp, implementation

Gleb and Boating

brute force, constructive algorithms, data structures, dp, graphs, greedy, math, number theory, shortest paths

Igor and Mountain

binary search, brute force, dp

Team Training

dp, greedy, sortings

Pushing Balls

brute force, dp, implementation

Key of Like (Hard Version)

dp, math, probabilities

Key of Like (Easy Version)

dp, games, math, probabilities

Canteen (Hard Version)

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

Weapon Upgrade

*special problem, *special problem, dp