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Before contest
Codeforces Round 941 (Div. 1)
15:33:55
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Before contest
Codeforces Round 941 (Div. 2)
15:33:55
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sortings
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
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number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x8546
710B
Optimal Point on a Line
brute force
,
sortings
1400
x8515
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8511
1286A
Garland
dp
,
greedy
,
sortings
1800
x8380
735B
Urbanization
greedy
,
number theory
,
sortings
1100
x8298
1077D
Cutting Out
binary search
,
sortings
1600
x8294
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8281
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8202
382C
Arithmetic Progression
implementation
,
sortings
1700
x8151
1361A
Johnny and Contribution
constructive algorithms
,
graphs
,
greedy
,
sortings
1700
x8141
940A
Points on the line
brute force
,
greedy
,
sortings
1200
x8131
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x8027
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8023
653A
Bear and Three Balls
brute force
,
implementation
,
sortings
900
x7991
990B
Micro-World
greedy
,
sortings
1200
x7978
12B
Correct Solution?
implementation
,
sortings
1100
x7961
1367D
Task On The Board
constructive algorithms
,
greedy
,
implementation
,
sortings
1800
x7960
845C
Two TVs
data structures
,
greedy
,
sortings
1500
x7859
624B
Making a String
greedy
,
sortings
1100
x7842
1165E
Two Arrays and Sum of Functions
greedy
,
math
,
sortings
1600
x7774
299A
Ksusha and Array
brute force
,
number theory
,
sortings
1000
x7717
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7704
686B
Little Robber Girl's Zoo
constructive algorithms
,
implementation
,
sortings
1100
x7696
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7687
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7672
1560E
Polycarp and String Transformation
binary search
,
implementation
,
sortings
,
strings
1800
x7639
845A
Chess Tourney
implementation
,
sortings
1100
x7626
1136C
Nastya Is Transposing Matrices
constructive algorithms
,
sortings
1500
x7595
1101C
Division and Union
sortings
1500
x7556
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7541
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7538
863B
Kayaking
brute force
,
greedy
,
sortings
1500
x7533
762B
USB vs. PS/2
greedy
,
implementation
,
sortings
,
two pointers
1400
x7478
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7459
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7445
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7424
960B
Minimize the error
data structures
,
greedy
,
sortings
1500
x7353
424B
Megacity
binary search
,
greedy
,
implementation
,
sortings
1200
x7323
1420D
Rescue Nibel!
combinatorics
,
data structures
,
sortings
1800
x7295
581C
Developing Skills
implementation
,
math
,
sortings
1400
x7239
1619D
New Year's Problem
binary search
,
greedy
,
sortings
1800
x7225
1061B
Views Matter
greedy
,
implementation
,
sortings
1400
x7213
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7198
632C
The Smallest String Concatenation
sortings
,
strings
1700
x7183
1029C
Maximal Intersection
greedy
,
math
,
sortings
1600
x7157
1121A
Technogoblet of Fire
implementation
,
sortings
1100
x7087
1296E1
String Coloring (easy version)
constructive algorithms
,
dp
,
graphs
,
greedy
,
sortings
1800
x7086
557B
Pasha and Tea
constructive algorithms
,
implementation
,
math
,
sortings
1500
x7075
137C
History
sortings
1500
x7051
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x7029
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7014
234B
Reading
sortings
1000
x6968
1242B
0-1 MST
dfs and similar
,
dsu
,
graphs
,
sortings
1900
x6954
840A
Leha and Function
combinatorics
,
greedy
,
math
,
number theory
,
sortings
1300
x6953
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x6829
967B
Watering System
math
,
sortings
1000
x6820
79B
Colorful Field
implementation
,
sortings
1400
x6774
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x6768
981B
Businessmen Problems
sortings
1000
x6743
1158A
The Party and Sweets
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
1500
x6739
572B
Order Book
data structures
,
greedy
,
implementation
,
sortings
1300
x6735
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x6693
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6666
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6621
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x6604
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6591
381B
Sereja and Stairs
greedy
,
implementation
,
sortings
1100
x6574
830A
Office Keys
binary search
,
brute force
,
dp
,
greedy
,
sortings
1800
x6545
169A
Chores
sortings
800
x6545
1859D
Andrey and Escape from Capygrad
binary search
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1800
x6509
379C
New Year Ratings Change
greedy
,
sortings
1400
x6493
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6445
811B
Vladik and Complicated Book
implementation
,
sortings
1200
x6436
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6428
1000C
Covered Points Count
data structures
,
implementation
,
sortings
1700
x6419
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6385
1870D
Prefix Purchase
greedy
,
implementation
,
sortings
1800
x6383
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6374
166C
Median
greedy
,
math
,
sortings
1500
x6333
1930C
Lexicographically Largest
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
1700
x6323
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6275
976C
Nested Segments
greedy
,
implementation
,
sortings
1500
x6267
659B
Qualifying Contest
constructive algorithms
,
sortings
1300
x6176
1012A
Photo of The Sky
brute force
,
implementation
,
math
,
sortings
1500
x6147
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6126
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6083
1444B
Divide and Sum
combinatorics
,
math
,
sortings
1900
x6028
1154E
Two Teams
data structures
,
implementation
,
sortings
1800
x6022
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6015
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x5977
808C
Tea Party
constructive algorithms
,
greedy
,
sortings
1400
x5953
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x5882
471B
MUH and Important Things
implementation
,
sortings
1300
x5881
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5859
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5828
439D
Devu and his Brother
binary search
,
sortings
,
ternary search
,
two pointers
1700
x5777
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5774
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5767
12C
Fruits
greedy
,
implementation
,
sortings
1100
x5719
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5693
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