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Codeforces Round (Div. 2)
5 days
Register now »
*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
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14807
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x959
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4156
1515D
Phoenix and Socks
greedy
,
sortings
,
two pointers
1500
x11240
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x591
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x712
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6075
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x981
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3239
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x425
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x781
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1581
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8114
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5272
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x878
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4807
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15748
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4415
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x539
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x9869
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7830
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
x21685
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1868
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10555
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4284
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9376
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13394
1462A
Favorite Sequence
implementation
,
two pointers
800
x40547
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3859
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1489
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5352
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1253
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x1230
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1301
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1179
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2138
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
x1004
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8718
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2188
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4721
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x15001
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1525
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x358
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x12028
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5583
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7639
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4192
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8708
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11598
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2541
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x289
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x940
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9896
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2233
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x28137
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1077
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x300
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6510
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x356
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18608
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10336
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x500
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1452
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12904
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4652
1379D
New Passenger Trams
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
2300
x1063
1379C
Choosing flowers
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
two pointers
2000
x5456
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x911
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x22752
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x1020
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19217
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1501
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x3078
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x4052
1366B
Shuffle
math
,
two pointers
1300
x20033
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x19018
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x27249
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x9122
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27318
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8074
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10328
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x29782
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19826
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12475
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x37295
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x6041
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x11235
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x8204
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10704
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x4191
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12429
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1618
1326E
Bombs
data structures
,
two pointers
2400
x2165
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x27391
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x525
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x881
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11645
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6253
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