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Codeforces Round (Div. 2)
4 days
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Difficulty:
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two pointers
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
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x4224
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12500
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1637
1326E
Bombs
data structures
,
two pointers
2400
x2175
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x27724
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x531
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x900
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11680
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6287
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x16230
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5271
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1819
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4278
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1928
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3564
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12533
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7499
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15844
1254B2
Send Boxes to Alice (Hard Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
2100
x3128
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4602
1252E
Songwriter
greedy
,
two pointers
2200
x1229
1251C
Minimize The Integer
greedy
,
two pointers
1600
x12170
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x19389
1250G
Discarding Game
dp
,
greedy
,
two pointers
2300
x716
1244E
Minimizing Difference
binary search
,
constructive algorithms
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x4997
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x15542
1225B2
TV Subscriptions (Hard Version)
implementation
,
two pointers
1300
x10412
1223D
Sequence Sorting
dp
,
greedy
,
two pointers
2000
x3982
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x3143
1208B
Uniqueness
binary search
,
brute force
,
implementation
,
two pointers
1500
x10305
1203D2
Remove the Substring (hard version)
binary search
,
greedy
,
implementation
,
two pointers
1700
x7270
1200D
White Lines
brute force
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4104
1198A
MP3
sortings
,
two pointers
1600
x8977
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9648
1195E
OpenStreetMap
data structures
,
two pointers
2100
x2982
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x982
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2242
1190A
Tokitsukaze and Discard Items
implementation
,
two pointers
1400
x9308
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x4431
1181D
Irrigation
binary search
,
data structures
,
implementation
,
sortings
,
trees
,
two pointers
2200
x2328
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x451
1168B
Good Triple
brute force
,
two pointers
1900
x3539
1167E
Range Deleting
binary search
,
combinatorics
,
data structures
,
two pointers
2100
x2637
1166C
A Tale of Two Lands
binary search
,
sortings
,
two pointers
1500
x9332
1158A
The Party and Sweets
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
1500
x7024
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2594
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2941
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x6008
1148E
Earth Wind and Fire
constructive algorithms
,
greedy
,
math
,
sortings
,
two pointers
2300
x1660
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7335
1133E
K Balanced Teams
dp
,
sortings
,
two pointers
1800
x5361
1133C
Balanced Team
sortings
,
two pointers
1200
x22132
1131G
Most Dangerous Shark
data structures
,
dp
,
two pointers
2700
x422
1120A
Diana and Liana
greedy
,
implementation
,
two pointers
1900
x1629
1107C
Brutality
greedy
,
sortings
,
two pointers
1300
x9884
1073C
Vasya and Robot
binary search
,
two pointers
1800
x4636
1066B
Heaters
greedy
,
two pointers
1500
x8225
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4858
1044A
The Tower is Going Home
binary search
,
two pointers
1700
x2879
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4402
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x6092
1041D
Glider
binary search
,
data structures
,
two pointers
1700
x5941
1041C
Coffee Break
binary search
,
data structures
,
greedy
,
two pointers
1600
x9372
1036D
Vasya and Arrays
greedy
,
two pointers
1600
x9169
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x447
1007A
Reorder the Array
combinatorics
,
data structures
,
math
,
sortings
,
two pointers
1300
x12073
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20758
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x510
985E
Pencils and Boxes
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2100
x3591
978C
Letters
binary search
,
implementation
,
two pointers
1000
x25123
965D
Single-use Stones
binary search
,
flows
,
greedy
,
two pointers
1900
x3057
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x20281
958F2
Lightsabers (medium)
binary search
,
two pointers
1800
x1221
954G
Castle Defense
binary search
,
data structures
,
greedy
,
two pointers
2000
x2118
939E
Maximize!
binary search
,
greedy
,
ternary search
,
two pointers
1800
x3073
939C
Convenient For Everybody
binary search
,
two pointers
1600
x4610
924B
Three-level Laser
binary search
,
greedy
,
two pointers
1600
x5164
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x9100
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1544
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1160
899E
Segments Removal
data structures
,
dsu
,
flows
,
implementation
,
two pointers
2000
x2994
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3454
892B
Wrath
greedy
,
implementation
,
two pointers
1200
x8819
888C
K-Dominant Character
binary search
,
implementation
,
two pointers
1400
x8163
887D
Ratings and Reality Shows
data structures
,
two pointers
2400
x475
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5175
873C
Strange Game On Matrix
greedy
,
two pointers
1600
x3232
853B
Jury Meeting
greedy
,
sortings
,
two pointers
1800
x2506
848B
Rooter's Song
constructive algorithms
,
data structures
,
geometry
,
implementation
,
sortings
,
two pointers
1900
x1877
846F
Random Query
data structures
,
math
,
probabilities
,
two pointers
1800
x2233
842A
Kirill And The Game
brute force
,
two pointers
1200
x10084
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4788
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1194
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x2239
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6478
799E
Aquarium decoration
data structures
,
greedy
,
two pointers
2500
x928
788A
Functions again
dp
,
two pointers
1600
x9048
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x118
777C
Alyona and Spreadsheet
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1600
x6330
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x217
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