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Codeforces Round 937 (Div. 4)
05:53:06
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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
1184E2
Daleks' Invasion (medium)
dfs and similar
,
graphs
,
shortest paths
,
trees
2100
x887
1184A2
Heidi Learns Hashing (Medium)
brute force
,
number theory
2100
x923
1183G
Candy Box (hard version)
greedy
,
implementation
,
sortings
2000
x2257
1183F
Topforces Strikes Back
brute force
,
math
,
sortings
2100
x1755
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4474
1176F
Destroy it!
dp
,
implementation
,
sortings
2100
x1717
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2375
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2632
1165F2
Microtransactions (hard version)
binary search
,
greedy
,
implementation
2000
x2009
1165F1
Microtransactions (easy version)
binary search
,
greedy
2000
x1752
1163D
Mysterious Code
dp
,
strings
2100
x1198
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1667
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2344
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5705
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2504
1152D
Neko and Aki's Prank
dp
,
greedy
,
trees
2100
x2232
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3000
1147C
Thanos Nim
games
2000
x2970
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1059
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2601
1132F
Clear the String
dp
2000
x7188
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x2995
1129B
Wrong Answer
constructive algorithms
2000
x2130
1120C
Compress String
dp
,
strings
2100
x1865
1117D
Magic Gems
dp
,
math
,
matrices
2100
x3976
1108F
MST Unification
binary search
,
dsu
,
graphs
,
greedy
2100
x2531
1108E2
Array and Segments (Hard version)
data structures
,
implementation
2100
x2101
1106E
Lunar New Year and Red Envelopes
data structures
,
dp
2100
x2302
1103B
Game with modulo
binary search
,
constructive algorithms
,
interactive
2000
x3150
1102F
Elongated Matrix
binary search
,
bitmasks
,
brute force
,
dp
,
graphs
2000
x1856
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4350
1098B
Nice table
brute force
,
constructive algorithms
,
greedy
,
math
2100
x1462
1092E
Minimal Diameter Forest
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2000
x1603
1090L
Berland University
greedy
,
math
2000
x1240
1090K
Right Expansion Of The Mind
math
2000
x1040
1090I
Minimal Product
2000
x1019
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2734
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1834
1082E
Increasing Frequency
binary search
,
dp
,
greedy
2000
x3890
1080D
Olya and magical square
constructive algorithms
,
implementation
,
math
2000
x1501
1077F2
Pictures with Kittens (hard version)
data structures
,
dp
2100
x2817
1070E
Getting Deals Done
binary search
,
data structures
2100
x1186
1070C
Cloud Computing
data structures
,
greedy
2000
x1987
1066F
Yet another 2D Walking
dp
2100
x1739
1061D
TV Shows
data structures
,
greedy
,
implementation
,
sortings
2000
x2268
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x2956
1057C
Tanya and Colored Candies
*special problem
,
dp
2000
x852
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1941
1044C
Optimal Polygon Perimeter
dp
,
geometry
2100
x1197
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2265
1033D
Divisors
interactive
,
math
,
number theory
2000
x2284
1032E
The Unbearable Lightness of Weights
dp
,
math
2100
x1468
1030E
Vasya and Good Sequences
bitmasks
,
dp
2000
x2952
1029F
Multicolored Markers
binary search
,
brute force
,
math
,
number theory
2000
x2452
1029E
Tree with Small Distances
dp
,
graphs
,
greedy
2100
x2736
1028D
Order book
combinatorics
,
data structures
,
greedy
2100
x1707
1027E
Inverse Coloring
combinatorics
,
dp
,
math
2100
x1850
1025D
Recovering BST
brute force
,
dp
,
math
,
number theory
,
trees
2100
x3288
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1944
1019B
The hat
binary search
,
interactive
2000
x1883
1010D
Mars rover
dfs and similar
,
graphs
,
implementation
,
trees
2000
x2298
1009E
Intercity Travelling
combinatorics
,
math
,
probabilities
2000
x2868
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x4554
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1581
1003E
Tree Constructing
constructive algorithms
,
graphs
2100
x2411
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3817
999F
Cards and Joy
dp
2000
x2484
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6283
997B
Roman Digits
brute force
,
combinatorics
,
dp
,
greedy
,
math
2000
x2845
995A
Tesla
constructive algorithms
,
implementation
2100
x1489
993C
Careful Maneuvering
bitmasks
,
brute force
,
geometry
2100
x1475
992D
Nastya and a Game
brute force
,
implementation
,
math
2100
x1578
990E
Post Lamps
brute force
,
greedy
2100
x1966
988F
Rain and Umbrellas
dp
2100
x2161
988E
Divisibility by 25
brute force
,
greedy
2100
x3607
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3202
985D
Sand Fortress
binary search
,
constructive algorithms
,
math
2100
x2221
980D
Perfect Groups
dp
,
math
,
number theory
2100
x2389
976E
Well played!
greedy
,
sortings
2100
x2153
975D
Ghosts
geometry
,
math
2000
x1861
965C
Greedy Arkady
math
2000
x2048
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2680
961D
Pair Of Lines
geometry
2000
x4071
960F
Pathwalks
data structures
,
dp
,
graphs
2100
x2636
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1674
958C2
Encryption (medium)
dp
2000
x1129
958A2
Death Stars (medium)
hashing
,
strings
2000
x870
955C
Sad powers
binary search
,
math
,
number theory
2100
x2441
954G
Castle Defense
binary search
,
data structures
,
greedy
,
two pointers
2000
x1885
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x965
954E
Water Taps
binary search
,
greedy
,
sortings
2000
x1779
952E
Cheese Board
2000
x618
940E
Cashback
data structures
,
dp
,
greedy
,
math
2000
x3370
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x4971
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x3019
933B
A Determined Cleanup
math
2000
x1868
926J
Segments
data structures
2100
x362
926F
Mobile Communications
2000
x220
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6102
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x5636
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