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Before contest
Refact.ai Match 1 (Codeforces Round 985)
12:50:11
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x1003
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2733
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5654
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x13759
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x21048
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x27947
1919H
Tree Diameter
interactive
,
trees
2000
x144
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x182
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x864
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2204
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x859
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3912
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x19277
1919B
Plus-Minus Split
greedy
800
x29806
1919A
Wallet Exchange
games
,
math
800
x33481
1918G
Permutation of Given
constructive algorithms
,
math
2700
x473
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x874
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1745
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4834
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x14143
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x23922
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x30335
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x976
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1395
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1803
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x10565
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x22677
1917A
Least Product
constructive algorithms
,
math
800
x25592
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x539
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x616
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x149
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x499
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2269
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x8574
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x17931
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x26006
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x26106
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x6493
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x13983
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x22149
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x30514
1915C
Can I Square?
binary search
,
implementation
800
x43198
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x42666
1915A
Odd One Out
bitmasks
,
implementation
800
x58132
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1397
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1917
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x4164
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x12530
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x12328
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x22197
1914C
Quests
greedy
,
math
1100
x24507
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x30468
1914A
Problemsolving Log
implementation
,
strings
800
x31954
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x329
1913E
Matrix Problem
flows
,
graphs
2400
x1043
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x3210
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x15162
1913B
Swap and Delete
strings
1000
x27516
1913A
Rating Increase
implementation
800
x24114
1912L
LOL Lovers
strings
800
x7069
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2525
1912J
Joy of Pokémon Observation
2300
x587
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x57
1912H
Hypercatapult Commute
graphs
2400
x451
1912G
Great City Saint Petersburg
data structures
2400
x472
1912F
Fugitive Frenzy
math
,
probabilities
3100
x115
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x933
1912D
Divisibility Test
math
1900
x1503
1912C
Cactus Transformation
constructive algorithms
3300
x56
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x1069
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x2128
1910J
Two Colors
*special problem
2900
x48
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x50
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x90
1910G
Pool Records
*special problem
,
greedy
2700
x59
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x178
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x200
1910D
Remove and Add
*special problem
,
greedy
1800
x356
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x635
1910B
Security Guard
*special problem
,
greedy
1600
x679
1910A
Username
*special problem
,
implementation
1100
x1787
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x119
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x79
1909G
Pumping Lemma
hashing
,
strings
3000
x411
1909F2
Small Permutation Problem (Hard Version)
combinatorics
,
dp
,
math
2500
x947
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1830
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1388
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x4472
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x11292
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x17344
1909A
Distinct Buttons
implementation
,
math
800
x16825
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1970
1907F
Shift and Reverse
greedy
,
sortings
1800
x4935
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x10435
1907D
Jumping Through Segments
binary search
,
constructive algorithms
1400
x14475
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x20374
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x25896
1907A
Rook
implementation
800
x36995
1906M
Triangle Construction
greedy
,
math
1700
x2736
1906L
Palindromic Parentheses
constructive algorithms
2500
x541
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