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Before contest
WorldQuant Round 1 (Codeforces Round 1128, Div. 1 + Div. 2)
2 days
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→ Filter Problems
Difficulty:
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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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Custom test
Problems
#
Name
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x22833
1490C
Sum of Cubes
binary search
,
brute force
,
brute force
,
math
1100
x40315
1490B
Balanced Remainders
brute force
,
constructive algorithms
,
math
1000
x28264
1490A
Dense Array
greedy
,
math
800
x33497
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x48
1488I
Demonic Invasion
*special problem
,
flows
3100
x51
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x77
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x137
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x195
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x238
1488D
Problemsolving Marathon
*special problem
,
binary search
,
greedy
1900
x361
1488C
Two Policemen
*special problem
,
binary search
,
brute force
,
math
1900
x528
1488B
RBS Deletion
*special problem
,
greedy
1800
x608
1488A
From Zero To Y
*special problem
,
math
900
x1873
1487G
String Counting
combinatorics
,
dp
,
fft
,
math
2700
x760
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x546
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x5226
1487D
Pythagorean Triples
binary search
,
brute force
,
math
,
number theory
1500
x21100
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x15699
1487B
Cat Cycle
math
,
number theory
1200
x31236
1487A
Arena
implementation
,
sortings
800
x27838
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x907
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x3598
1486D
Max Median
binary search
,
data structures
,
dp
2100
x10639
1486C2
Guessing the Greatest (hard version)
binary search
,
interactive
1900
x10339
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x14606
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x21880
1486A
Shifting Stacks
greedy
,
implementation
900
x27407
1485F
Copy or Prefix Sum
combinatorics
,
data structures
,
dp
,
sortings
2400
x2481
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1604
1485D
Multiples and Power Differences
constructive algorithms
,
graphs
,
math
,
number theory
2200
x5774
1485C
Floor and Mod
binary search
,
brute force
,
math
,
number theory
1700
x11318
1485B
Replace and Keep Sorted
dp
,
implementation
,
math
1200
x18114
1485A
Add and Divide
brute force
,
greedy
,
math
,
number theory
1000
x36752
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x846
1482G
Vabank
binary search
,
interactive
3200
x365
1482F
Useful Edges
graphs
,
shortest paths
2400
x1814
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x4061
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x4165
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x10129
1482B
Restore Modulo
implementation
,
math
1500
x9707
1482A
Prison Break
math
800
x21463
1481F
AB Tree
dp
,
greedy
,
trees
3100
x919
1481E
Sorting Books
data structures
,
dp
,
greedy
2500
x2529
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4964
1481C
Fence Painting
brute force
,
constructive algorithms
,
greedy
1600
x12551
1481B
New Colony
brute force
,
greedy
,
implementation
1100
x20047
1481A
Space Navigation
greedy
,
strings
800
x25901
1480B
The Great Hero
greedy
,
implementation
,
sortings
900
x18055
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x27383
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x475
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x1471
1479C
Continuous City
bitmasks
,
constructive algorithms
2500
x1494
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x4615
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x7600
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x13497
1478C
Nezzar and Symmetric Array
implementation
,
math
,
sortings
1700
x10815
1478B
Nezzar and Lucky Number
brute force
,
dp
,
greedy
,
math
1100
x19132
1478A
Nezzar and Colorful Balls
brute force
,
greedy
800
x28300
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x387
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x308
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x833
1477C
Nezzar and Nice Beatmap
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
2200
x2673
1477B
Nezzar and Binary String
data structures
,
greedy
1900
x3747
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x6677
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x1056
1476F
Lanterns
binary search
,
data structures
,
dp
3000
x1243
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2882
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x9379
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x12457
1476B
Inflation
binary search
,
brute force
,
greedy
,
math
1300
x21988
1476A
K-divisible Sum
binary search
,
constructive algorithms
,
greedy
,
math
1000
x46409
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x8199
1475F
Unusual Matrix
2-sat
,
brute force
,
constructive algorithms
1900
x6082
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x19001
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x11449
1475C
Ball in Berland
combinatorics
,
graphs
,
math
1400
x29103
1475B
New Year's Number
brute force
,
dp
,
math
900
x59464
1475A
Odd Divisor
math
,
number theory
900
x94714
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x404
1474E
What Is It?
constructive algorithms
,
greedy
2500
x1550
1474D
Cleaning
data structures
,
dp
,
greedy
,
math
2200
x4380
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x14576
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x44136
1474A
Puzzle From the Future
greedy
800
x23615
1473G
Tiles
combinatorics
,
dp
,
fft
,
math
2800
x512
1473F
Strange Set
flows
,
math
2700
x1271
1473E
Minimum Path
graphs
,
shortest paths
2400
x5346
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x11260
1473C
No More Inversions
constructive algorithms
,
math
1500
x13553
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x35926
1473A
Replacing Elements
greedy
,
implementation
,
math
,
sortings
800
x37992
1472G
Moving to the Capital
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x6053
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x3372
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x9218
1472D
Even-Odd Game
dp
,
games
,
greedy
,
sortings
1200
x31608
1472C
Long Jumps
dp
,
graphs
1100
x36527
1472B
Fair Division
dp
,
greedy
,
math
800
x61844
1472A
Cards for Friends
greedy
,
math
800
x46513
1471B
Strange List
brute force
,
greedy
,
implementation
,
math
1100
x20075
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