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Before contest
Codeforces Round (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
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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Status
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Custom test
Problems
#
Name
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x3409
1709C
Recover an RBS
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x6176
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x4359
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x3699
1678B2
Tokitsukaze and Good 01-String (hard version)
dp
,
greedy
,
implementation
1800
x4959
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x3301
1674F
Desktop Rearrangement
data structures
,
greedy
,
implementation
1800
x3632
1666L
Labyrinth
dfs and similar
,
graphs
1800
x2060
1666C
Connect the Points
brute force
,
constructive algorithms
,
geometry
1800
x2179
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x4783
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x5827
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x4600
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x4393
1620C
BA-String
brute force
,
dp
,
greedy
,
implementation
,
math
1800
x5123
1619D
New Year's Problem
binary search
,
greedy
,
sortings
1800
x5456
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x3726
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x4521
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x4482
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x3712
1575D
Divisible by Twenty-Five
brute force
,
dfs and similar
,
dp
1800
x1694
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x6542
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x246
1571C
Rhyme
*special problem
,
implementation
1800
x296
1560E
Polycarp and String Transformation
binary search
,
implementation
,
sortings
,
strings
1800
x6370
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x5045
1556C
Compressed Bracket Sequence
brute force
,
implementation
1800
x4958
1554D
Diane
constructive algorithms
,
greedy
,
strings
1800
x7271
1554C
Mikasa
binary search
,
bitmasks
,
greedy
,
implementation
1800
x6951
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x5470
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5156
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x7305
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x6193
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x4755
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x7409
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x6102
1509C
The Sports Festival
dp
,
greedy
1800
x9165
1508B
Almost Sorted
binary search
,
combinatorics
,
constructive algorithms
,
implementation
1800
x3229
1505E
Cakewalk
*special problem
,
greedy
,
implementation
,
shortest paths
1800
x1539
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x583
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x7373
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x5827
1488B
RBS Deletion
*special problem
,
greedy
1800
x468
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x4948
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x7844
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x2814
1466E
Apollo versus Pan
bitmasks
,
brute force
,
math
1800
x5963
1463C
Busy Robot
implementation
1800
x4785
1462F
The Treasure of The Segments
binary search
,
data structures
,
greedy
1800
x5411
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x4627
1446B
Catching Cheaters
dp
,
strings
1800
x6394
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x3736
1442A
Extreme Subtraction
constructive algorithms
,
dp
,
greedy
1800
x7208
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x8412
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x6200
1420D
Rescue Nibel!
combinatorics
,
data structures
,
sortings
1800
x6118
1409E
Two Platforms
binary search
,
dp
,
sortings
,
two pointers
1800
x6472
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x945
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x7501
1398D
Colored Rectangles
dp
,
greedy
,
sortings
1800
x9436
1396B
Stoned Game
brute force
,
constructive algorithms
,
games
,
greedy
1800
x9107
1394A
Boboniu Chats with Du
dp
,
greedy
,
sortings
,
two pointers
1800
x5761
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x8266
1381B
Unmerge
dp
1800
x7364
1367D
Task On The Board
constructive algorithms
,
greedy
,
implementation
,
sortings
1800
x7235
1355C
Count Triangles
binary search
,
implementation
,
math
,
two pointers
1800
x8978
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x7085
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x6934
1334D
Minimum Euler Cycle
constructive algorithms
,
graphs
,
greedy
,
implementation
1800
x6312
1329A
Dreamoon Likes Coloring
constructive algorithms
,
greedy
,
implementation
,
math
1800
x7924
1328D
Carousel
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
1800
x10572
1327E
Count The Blocks
combinatorics
,
dp
,
math
1800
x7490
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x7917
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x6459
1316C
Primitive Primes
constructive algorithms
,
math
,
ternary search
1800
x6425
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x5359
1299B
Aerodynamic
geometry
1800
x4639
1296E1
String Coloring (easy version)
constructive algorithms
,
dp
,
graphs
,
greedy
,
sortings
1800
x5972
1295D
Same GCDs
math
,
number theory
1800
x6856
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4129
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x3893
1286A
Garland
dp
,
greedy
,
sortings
1800
x7129
1283E
New Year Parties
dp
,
greedy
1800
x5351
1283D
Christmas Trees
graphs
,
greedy
,
shortest paths
1800
x6256
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x3717
1280B
Beingawesomeism
implementation
,
math
1800
x3382
1267L
Lexicography
constructive algorithms
,
strings
1800
x2372
1267J
Just Arrange the Icons
greedy
,
implementation
,
math
1800
x2168
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x3792
1252H
Twin Buildings
greedy
,
implementation
1800
x2294
1250J
The Parade
binary search
,
greedy
1800
x2373
1250B
The Feast and the Bus
brute force
,
constructive algorithms
,
greedy
,
math
1800
x2247
1249D2
Too Many Segments (hard version)
data structures
,
greedy
,
sortings
1800
x4010
1249D1
Too Many Segments (easy version)
greedy
1800
x4005
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x6197
1227D2
Optimal Subsequences (Hard Version)
data structures
,
greedy
1800
x3833
1225D
Power Products
hashing
,
math
,
number theory
1800
x5702
1221D
Make The Fence Great Again
dp
1800
x7274
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x4952
1208C
Magic Grid
constructive algorithms
1800
x5309
1207D
Number Of Permutations
combinatorics
1800
x4995
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