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Before contest
Codeforces Round 937 (Div. 4)
02:00:40
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Difficulty:
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math
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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Custom test
Problems
#
Name
1201C
Maximum Median
binary search
,
greedy
,
math
,
sortings
1400
x20859
1201B
Zero Array
greedy
,
math
1500
x17409
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x894
1200C
Round Corridor
math
,
number theory
1400
x9563
1199B
Water Lily
geometry
,
math
1000
x19463
1197D
Yet Another Subarray Problem
dp
,
greedy
,
math
1900
x5052
1197A
DIY Wooden Ladder
greedy
,
math
,
sortings
900
x13208
1196B
Odd Sum Segments
constructive algorithms
,
math
1200
x16060
1196A
Three Piles of Candies
brute force
,
constructive algorithms
,
math
800
x26996
1195F
Geometers Anonymous Club
data structures
,
geometry
,
math
,
sortings
2500
x664
1195D2
Submarine in the Rybinsk Sea (hard edition)
combinatorics
,
math
,
number theory
1800
x4399
1195D1
Submarine in the Rybinsk Sea (easy edition)
combinatorics
,
math
,
number theory
1500
x7639
1195B
Sport Mafia
binary search
,
brute force
,
math
1000
x18813
1195A
Drinks Choosing
greedy
,
math
1000
x12310
1194D
1-2-K Game
games
,
math
1700
x6156
1194A
Remove a Progression
math
800
x15780
1193A
Amusement Park
*special problem
,
dp
,
math
x232
1189C
Candies!
data structures
,
dp
,
implementation
,
math
1400
x10221
1189B
Number Circle
greedy
,
math
,
sortings
1100
x13581
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4182
1187F
Expected Square Beauty
dp
,
math
,
probabilities
2500
x827
1187A
Stickers and Toys
math
900
x14408
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x552
1186D
Vus the Cossack and Numbers
constructive algorithms
,
greedy
,
math
1500
x8682
1186C
Vus the Cossack and Strings
implementation
,
math
1800
x5818
1185D
Extra Element
implementation
,
math
1700
x6406
1185C2
Exam in BerSU (hard version)
brute force
,
data structures
,
greedy
,
math
1700
x7117
1185A
Ropewalkers
math
800
x14499
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x101
1184A3
Heidi Learns Hashing (Hard)
fft
,
math
,
number theory
3100
x130
1184A1
Heidi Learns Hashing (Easy)
brute force
,
math
,
number theory
1200
x5792
1183F
Topforces Strikes Back
brute force
,
math
,
sortings
2100
x1755
1183C
Computer Game
binary search
,
math
1400
x13568
1183B
Equalize Prices
math
900
x17882
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2505
1182A
Filling Shapes
dp
,
math
1000
x28707
1181A
Chunga-Changa
greedy
,
math
1000
x13022
1180A
Alex and a Rhombus
dp
,
implementation
,
math
800
x23985
1179C
Serge and Dining Room
binary search
,
data structures
,
graph matchings
,
greedy
,
implementation
,
math
,
trees
2200
x1932
1178D
Prime Graph
constructive algorithms
,
greedy
,
math
,
number theory
1500
x7115
1178C
Tiles
combinatorics
,
greedy
,
math
1300
x11102
1176B
Merge it!
math
1100
x16697
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1505
1175A
From Hero to Zero
implementation
,
math
900
x17473
1174E
Ehab and the Expected GCD Problem
combinatorics
,
dp
,
math
,
number theory
2500
x1338
1170A
Three Integers Again
*special problem
,
math
x1355
1169A
Circle Metro
implementation
,
math
900
x11492
1168E
Xor Permutations
constructive algorithms
,
math
3100
x346
1167F
Scalar Queries
combinatorics
,
data structures
,
math
,
sortings
2300
x1421
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x10266
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2632
1166D
Cute Sequences
binary search
,
brute force
,
greedy
,
math
2200
x1992
1166B
All the Vowels Please
constructive algorithms
,
math
,
number theory
1100
x11090
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x7601
1165D
Almost All Divisors
math
,
number theory
1600
x14862
1165A
Remainder
implementation
,
math
1100
x13375
1163E
Magical Permutation
bitmasks
,
brute force
,
constructive algorithms
,
data structures
,
graphs
,
math
2400
x636
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3378
1163A
Eating Soup
greedy
,
math
900
x12537
1159B
Expansion coefficient of the array
implementation
,
math
1300
x6860
1159A
A pile of stones
implementation
,
math
800
x12168
1158F
Density of subarrays
dp
,
math
3500
x389
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x146
1158D
Winding polygonal line
constructive algorithms
,
geometry
,
greedy
,
math
2600
x655
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1667
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2047
1158A
The Party and Sweets
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
1500
x6682
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x3456
1156F
Card Bag
dp
,
math
,
probabilities
2300
x1313
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1378
1155C
Alarm Clocks Everywhere
math
,
number theory
1300
x8884
1154G
Minimum Possible LCM
brute force
,
greedy
,
math
,
number theory
2200
x2591
1154C
Gourmet Cat
implementation
,
math
1400
x10039
1154B
Make Them Equal
math
1200
x16084
1154A
Restoring Three Numbers
math
800
x65260
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x740
1153A
Serval and Bus
brute force
,
math
1000
x11169
1152C
Neko does Maths
brute force
,
math
,
number theory
1800
x6349
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8650
1152A
Neko Finds Grapes
greedy
,
implementation
,
math
800
x14777
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3000
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8028
1151C
Problem for Nazar
constructive algorithms
,
math
1800
x5089
1149A
Prefix Sum Primes
constructive algorithms
,
greedy
,
math
,
number theory
1200
x14452
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x311
1148E
Earth Wind and Fire
constructive algorithms
,
greedy
,
math
,
sortings
,
two pointers
2300
x1646
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1059
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3882
1143B
Nirvana
brute force
,
math
,
number theory
1200
x9799
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2601
1142A
The Beatles
brute force
,
math
1700
x3250
1141E
Superhero Battle
math
1700
x6418
1141C
Polycarp Restores Permutation
math
1500
x11182
1141A
Game 23
implementation
,
math
1000
x29128
1140D
Minimum Triangulation
dp
,
greedy
,
math
1200
x12325
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x1961
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x11722
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3785
1136B
Nastya Is Playing Computer Games
constructive algorithms
,
math
1000
x11496
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x10418
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