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Before contest
Codeforces Round 943 (Div. 3)
17:50:02
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Difficulty:
—
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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Problems
#
Name
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5551
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5555
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x5710
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5712
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5742
439D
Devu and his Brother
binary search
,
sortings
,
ternary search
,
two pointers
1700
x5787
1041D
Glider
binary search
,
data structures
,
two pointers
1700
x5795
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5829
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5831
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5889
749C
Voting
greedy
,
implementation
,
two pointers
1500
x5909
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x5980
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x5988
1776H
Beppa and SwerChat
two pointers
1300
x5996
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6003
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6069
505C
Mr. Kitayuta, the Treasure Hunter
dfs and similar
,
dp
,
two pointers
1900
x6069
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6166
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6271
777C
Alyona and Spreadsheet
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1600
x6276
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6297
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6412
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6449
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6637
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6667
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6694
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x6774
1158A
The Party and Sweets
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
1500
x6825
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x6836
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6850
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6923
1203D2
Remove the Substring (hard version)
binary search
,
greedy
,
implementation
,
two pointers
1700
x7024
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7149
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7171
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7201
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7292
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x7370
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7398
762B
USB vs. PS/2
greedy
,
implementation
,
sortings
,
two pointers
1400
x7490
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7541
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7689
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7712
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x7724
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7750
302B
Eugeny and Play List
binary search
,
implementation
,
two pointers
1200
x7775
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x7943
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8004
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8026
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8034
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8043
279C
Ladder
dp
,
implementation
,
two pointers
1700
x8045
1066B
Heaters
greedy
,
two pointers
1500
x8058
888C
K-Dominant Character
binary search
,
implementation
,
two pointers
1400
x8059
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8066
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8110
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8177
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8289
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8621
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8637
892B
Wrath
greedy
,
implementation
,
two pointers
1200
x8657
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8660
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x8749
1198A
MP3
sortings
,
two pointers
1600
x8757
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8938
788A
Functions again
dp
,
two pointers
1600
x8953
1036D
Vasya and Arrays
greedy
,
two pointers
1600
x8965
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x8986
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9037
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9097
1190A
Tokitsukaze and Discard Items
implementation
,
two pointers
1400
x9112
1166C
A Tale of Two Lands
binary search
,
sortings
,
two pointers
1500
x9116
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9201
1041C
Coffee Break
binary search
,
data structures
,
greedy
,
two pointers
1600
x9242
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9262
1196D2
RGB Substring (hard version)
data structures
,
dp
,
implementation
,
two pointers
1600
x9310
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9472
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9483
1107C
Brutality
greedy
,
sortings
,
two pointers
1300
x9643
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x9704
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9782
842A
Kirill And The Game
brute force
,
two pointers
1200
x9956
1208B
Uniqueness
binary search
,
brute force
,
implementation
,
two pointers
1500
x10061
1225B2
TV Subscriptions (Hard Version)
implementation
,
two pointers
1300
x10082
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10183
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10228
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10304
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10413
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x10413
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10483
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x10507
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10585
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10597
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x10693
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x10922
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x10969
1515D
Phoenix and Socks
greedy
,
sortings
,
two pointers
1500
x11143
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11213
1539D
PriceFixed
binary search
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x11267
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11312
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11384
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