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Before contest
Codeforces Round (Div. 3)
7 days
→ Filter Problems
Difficulty:
—
data structures
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
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Custom test
Problems
#
Name
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1535
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x311
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x85
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x841
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x583
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x111
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x627
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x540
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x805
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x311
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x434
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x380
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x365
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x737
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x151
1601E
Phys Ed Online
data structures
,
dp
,
greedy
2900
x467
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1402
1599I
Desert
data structures
,
graphs
2700
x113
1599E
Two Arrays
data structures
,
matrices
3200
x67
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x273
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x317
1583G
Omkar and Time Travel
data structures
,
math
3000
x405
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x70
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x223
1578B
Building Forest Trails
data structures
,
dsu
2800
x322
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x156
1572F
Stations
data structures
3400
x242
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x56
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x336
1558F
Strange Sort
data structures
,
sortings
3300
x359
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x310
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x833
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x636
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x344
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x106
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x81
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x75
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x267
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x443
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x537
1530H
Turing's Award
data structures
,
dp
3400
x146
1523H
Hopping Around the Array
data structures
,
dp
3500
x235
1523G
Try Booking
data structures
,
divide and conquer
3200
x405
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x238
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x219
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x708
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x422
1508F
Optimal Encoding
brute force
,
data structures
3500
x118
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x330
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x136
1500E
Subset Trick
binary search
,
data structures
3300
x213
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x422
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x188
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x286
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x408
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x75
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x770
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x34
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x56
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x443
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x976
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x119
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x537
1476F
Lanterns
binary search
,
data structures
,
dp
3000
x641
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x294
1468B
Bakery
data structures
,
dsu
2900
x209
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x184
1464F
My Beautiful Madness
data structures
,
trees
3500
x289
1458F
Range Diameter Sum
data structures
,
trees
3500
x260
1458E
Nim Shortcuts
data structures
,
games
3100
x412
1458D
Flip and Reverse
data structures
,
graphs
,
greedy
3100
x983
1455G
Forbidden Value
data structures
,
dp
2900
x399
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x461
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x274
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1239
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x1943
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x218
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x310
1425I
Impressive Harvesting of The Orchard
data structures
2800
x232
1423G
Growing flowers
data structures
3500
x184
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x975
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x477
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x358
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x279
1413F
Roads and Ramen
data structures
,
trees
2800
x715
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x357
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x299
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x400
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x440
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x120
1383E
Strange Operation
combinatorics
,
data structures
,
dp
2800
x757
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x473
1379F1
Chess Strikes Back (easy version)
binary search
,
data structures
2700
x578
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x509
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x404
1366G
Construct the String
data structures
,
dp
,
strings
2700
x534
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x147
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x401
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x48
1344E
Train Tracks
data structures
,
trees
3100
x321
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