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WorldQuant Round 1 (Codeforces Round 1128, Div. 1 + Div. 2)
45:17:16
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combine-tags-by-or
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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
399B
Red and Blue Balls
x1926
399A
Pages
implementation
x4251
398E
Sorting Permutations
x124
398D
Instant Messanger
data structures
x1387
398C
Tree and Array
constructive algorithms
x226
398B
Painting The Wall
dp
,
probabilities
x1229
398A
Cards
constructive algorithms
,
implementation
x970
397B
On Corruption and Numbers
constructive algorithms
,
implementation
,
math
x838
397A
On Segment's Own Points
implementation
x2739
396E
On Iteration of One Well-Known Function
math
x167
396D
On Sum of Number of Inversions in Permutations
combinatorics
,
math
x466
396C
On Changing Tree
data structures
,
graphs
,
trees
x1900
396B
On Sum of Fractions
math
,
number theory
x1204
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1660
394E
Lightbulb for Minister
geometry
x135
394D
Physical Education and Buns
brute force
,
implementation
,
math
x301
394C
Dominoes
constructive algorithms
,
greedy
x563
394B
Very Beautiful Number
math
x629
394A
Counting Sticks
brute force
,
implementation
x2743
393B
Three matrices
x2089
393A
Nineteen
x7029
392E
Deleting Substrings
x197
392D
Three Arrays
data structures
x247
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x697
392B
Tower of Hanoi
dp
x1073
392A
Blocked Points
math
x1013
391F3
Stock Trading
x120
391F2
Stock Trading
greedy
x123
391F1
Stock Trading
dp
x233
391E2
Three Trees
x192
391E1
Three Trees
x137
391D2
Supercollider
data structures
x220
391D1
Supercollider
brute force
x296
391C3
The Tournament
x182
391C2
The Tournament
greedy
x158
391C1
The Tournament
brute force
x216
391B
Word Folding
brute force
x449
391A
Genetic Engineering
implementation
,
two pointers
x1821
390E
Inna and Large Sweet Matrix
x279
390D
Inna and Sweet Matrix
constructive algorithms
x539
390C
Inna and Candy Boxes
data structures
x701
390B
Inna, Dima and Song
implementation
x1316
390A
Inna and Alarm Clock
implementation
x3784
389B
Fox and Cross
greedy
,
implementation
1100
x7395
389A
Fox and Number Game
greedy
,
math
1000
x15126
388E
Fox and Meteor Shower
geometry
3100
x263
388D
Fox and Perfect Sets
math
2700
x526
388C
Fox and Card Game
games
,
greedy
,
sortings
2000
x3983
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2624
388A
Fox and Box Accumulation
greedy
,
sortings
1400
x12042
387E
George and Cards
binary search
,
data structures
2200
x1028
387D
George and Interesting Graph
graph matchings
2200
x1236
387C
George and Number
greedy
,
implementation
1700
x2315
387B
George and Round
brute force
,
greedy
,
two pointers
1200
x13171
387A
George and Sleep
implementation
900
x10694
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x587
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x988
386B
Fly, freebies, fly!
binary search
,
brute force
,
implementation
1400
x2583
386A
Second-Price Auction
implementation
800
x7896
385E
Bear in the Field
math
,
matrices
2300
x693
385D
Bear and Floodlight
bitmasks
,
dp
,
geometry
2200
x976
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x10931
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x11020
385A
Bear and Raspberry
brute force
,
greedy
,
implementation
1000
x17481
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3854
384A
Coder
implementation
800
x17501
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x4842
383D
Antimatter
dp
2300
x3473
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x8058
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x822
383A
Milking cows
data structures
,
greedy
1600
x5643
382E
Ksenia and Combinatorics
combinatorics
,
dp
2600
x471
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x757
382C
Arithmetic Progression
implementation
,
sortings
1700
x8829
382B
Number Busters
binary search
,
math
2000
x1534
382A
Ksenia and Pan Scales
greedy
,
implementation
1100
x13940
381B
Sereja and Stairs
greedy
,
implementation
,
sortings
1100
x7459
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x97004
380E
Sereja and Dividing
data structures
2600
x380
380D
Sereja and Cinema
combinatorics
,
math
2500
x562
380C
Sereja and Brackets
data structures
,
schedules
2000
x21925
380B
Sereja and Tree
graphs
,
implementation
2400
x586
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2961
379G
New Year Cactus
dp
3100
x347
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2877
379E
New Year Tree Decorations
geometry
,
schedules
,
sortings
2500
x407
379D
New Year Letter
bitmasks
,
brute force
,
dp
2000
x1705
379C
New Year Ratings Change
greedy
,
sortings
1400
x7115
379B
New Year Present
constructive algorithms
,
implementation
1200
x7654
379A
New Year Candles
implementation
1000
x54952
378B
Semifinals
implementation
,
sortings
1300
x6277
378A
Playing with Dice
brute force
800
x26383
377E
Cookie Clicker
dp
,
geometry
2800
x609
377D
Developing Game
data structures
2400
x1525
377C
Captains Mode
bitmasks
,
dp
,
games
2200
x1445
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x2623
377A
Maze
dfs and similar
1600
x28998
376B
I.O.U.
implementation
1300
x7032
376A
Lever
implementation
,
math
900
x10017
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x675
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