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Codeforces Round (Div. 2)
3 days
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*has extra registration
→ Filter Problems
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
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16266
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x2016
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14854
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x961
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4177
1515D
Phoenix and Socks
greedy
,
sortings
,
two pointers
1500
x11254
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x593
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x717
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6091
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x985
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3277
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x449
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x783
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1587
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8135
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5340
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x880
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4824
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15781
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4427
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x540
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x9893
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7846
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x296
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21774
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1886
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10577
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4291
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9419
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13447
1462A
Favorite Sequence
implementation
,
two pointers
800
x40706
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3875
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1491
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5361
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1256
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x1231
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1304
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1185
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2152
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x66
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x1005
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8727
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2194
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4731
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x15078
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1529
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x359
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x12116
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5593
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7707
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4242
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8746
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11688
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2589
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x290
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x942
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9981
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2238
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x28208
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1121
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x300
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6571
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x358
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18649
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10352
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x504
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1454
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12923
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4655
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1064
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5464
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x913
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x22859
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x1021
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19250
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1502
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x3084
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x4059
1366B
Shuffle
math
,
two pointers
1300
x20119
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x19110
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x27315
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x9190
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27400
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8084
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10522
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x30009
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19992
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12489
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x37451
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x6049
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x11251
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x8224
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10726
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x4202
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12443
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1620
1326E
Bombs
data structures
,
two pointers
2400
x2173
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x27515
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x528
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x886
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