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Before contest
Codeforces Round 954 (Div. 3)
5 days
→ 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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Custom test
Problems
#
Name
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
x708
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6054
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x977
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3229
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x422
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x775
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1573
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8085
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5261
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x872
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4788
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15709
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4404
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x537
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x9834
1472E
Correct Placement
binary search
,
data structures
,
dp
,
sortings
,
two pointers
1700
x7790
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x294
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21558
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1862
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10542
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4276
1462E2
Close Tuples (hard version)
binary search
,
combinatorics
,
implementation
,
math
,
sortings
,
two pointers
1700
x9314
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13334
1462A
Favorite Sequence
implementation
,
two pointers
800
x40374
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3842
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1489
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5339
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1241
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
x1299
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1175
1436E
Complicated Computations
binary search
,
data structures
,
two pointers
2400
x2133
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
x1002
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8700
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2178
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4707
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14938
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1494
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x358
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x11931
1413C
Perform Easily
binary search
,
brute force
,
dp
,
implementation
,
sortings
,
two pointers
1900
x5576
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x7625
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4183
1408C
Discrete Acceleration
binary search
,
dp
,
implementation
,
math
,
two pointers
1500
x8685
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11553
1404C
Fixed Point Removal
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2300
x2533
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
x911
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9873
1399E2
Weights Division (hard version)
binary search
,
dfs and similar
,
greedy
,
sortings
,
trees
,
two pointers
2200
x2229
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x28014
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1071
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x299
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x6487
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x353
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18510
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10271
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x455
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1396
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12811
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4645
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
x5448
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x908
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x22582
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x971
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19146
1367F2
Flying Sort (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2400
x1469
1367F1
Flying Sort (Easy Version)
dp
,
greedy
,
two pointers
2100
x3040
1366E
Two Arrays
binary search
,
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
two pointers
2100
x4028
1366B
Shuffle
math
,
two pointers
1300
x19898
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x18883
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x27104
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x9089
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27248
1358D
The Best Vacation
binary search
,
brute force
,
greedy
,
implementation
,
two pointers
1900
x8058
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x10312
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x29650
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19673
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12317
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x36999
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x5904
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x11103
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x8061
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10545
1333F
Kate and imperfection
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2200
x3991
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12226
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1613
1326E
Bombs
data structures
,
two pointers
2400
x2012
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x27176
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x523
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x736
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11626
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6236
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x16056
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5123
1285E
Delete a Segment
brute force
,
constructive algorithms
,
data structures
,
dp
,
graphs
,
sortings
,
trees
,
two pointers
2300
x1803
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4256
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