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Before contest
Codeforces Round 941 (Div. 1)
2 days
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
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implementation
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
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11655
1155B
Game with Telephone Numbers
games
,
greedy
,
implementation
1200
x11707
879B
Table Tennis
data structures
,
implementation
1200
x11840
342A
Xenia and Divisors
greedy
,
implementation
1200
x12087
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x12337
18C
Stripe
data structures
,
implementation
1200
x12429
1076B
Divisor Subtraction
implementation
,
math
,
number theory
1200
x12516
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x12661
1006B
Polycarp's Practice
greedy
,
implementation
,
sortings
1200
x12764
1185B
Email from Polycarp
implementation
,
strings
1200
x12855
1207B
Square Filling
constructive algorithms
,
greedy
,
implementation
1200
x12937
47B
Coins
implementation
1200
x12962
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x13265
1272B
Snow Walking Robot
constructive algorithms
,
greedy
,
implementation
1200
x13473
298B
Sail
brute force
,
greedy
,
implementation
1200
x13489
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x13853
714B
Filya and Homework
implementation
,
sortings
1200
x13992
439B
Devu, the Dumb Guy
implementation
,
sortings
1200
x14012
1428B
Belted Rooms
graphs
,
implementation
1200
x14156
1954B
Make It Ugly
implementation
,
math
1200
x14172
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14198
1704C
Virus
greedy
,
implementation
,
sortings
1200
x14322
1104B
Game with string
data structures
,
implementation
,
math
1200
x14413
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14456
285B
Find Marble
implementation
1200
x14714
1647B
Madoka and the Elegant Gift
brute force
,
constructive algorithms
,
graphs
,
implementation
1200
x15038
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x15092
552B
Vanya and Books
implementation
,
math
1200
x15179
913B
Christmas Spruce
implementation
,
trees
1200
x15355
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15535
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x15690
1674D
A-B-C Sort
constructive algorithms
,
implementation
,
sortings
1200
x15732
1881C
Perfect Square
brute force
,
implementation
1200
x15742
350A
TL
brute force
,
greedy
,
implementation
1200
x15907
1419B
Stairs
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x15937
1720C
Corners
greedy
,
implementation
1200
x16270
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16277
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16336
1657C
Bracket Sequence Deletion
greedy
,
implementation
1200
x16483
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16554
1485B
Replace and Keep Sorted
dp
,
implementation
,
math
1200
x16641
1703E
Mirror Grid
implementation
1200
x16757
1679B
Stone Age Problem
data structures
,
implementation
1200
x16867
1681C
Double Sort
implementation
,
sortings
1200
x16931
546B
Soldier and Badges
brute force
,
greedy
,
implementation
,
sortings
1200
x17156
1504B
Flip the Bits
constructive algorithms
,
greedy
,
implementation
,
math
1200
x17183
999C
Alphabetic Removals
implementation
1200
x17189
1669G
Fall Down
dfs and similar
,
implementation
1200
x17242
1637C
Andrew and Stones
greedy
,
implementation
1200
x17301
353A
Domino
implementation
,
math
1200
x17782
454B
Little Pony and Sort by Shift
implementation
1200
x17801
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x17913
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x18083
1832C
Contrast Value
greedy
,
implementation
1200
x18094
1392C
Omkar and Waterslide
greedy
,
implementation
1200
x18302
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x18756
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19104
27A
Next Test
implementation
,
sortings
1200
x19239
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x19412
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x19794
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x19988
1619C
Wrong Addition
implementation
1200
x20208
1454C
Sequence Transformation
greedy
,
implementation
1200
x20936
1294B
Collecting Packages
implementation
,
sortings
1200
x21183
1406B
Maximum Product
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x22003
285C
Building Permutation
greedy
,
implementation
,
sortings
1200
x22414
1334A
Level Statistics
implementation
,
math
1200
x22606
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x22639
1369B
AccurateLee
greedy
,
implementation
,
strings
1200
x23710
1272C
Yet Another Broken Keyboard
combinatorics
,
dp
,
implementation
1200
x25001
1355A
Sequence with Digits
brute force
,
implementation
,
math
1200
x25435
1537C
Challenging Cliffs
constructive algorithms
,
greedy
,
implementation
,
math
1200
x26238
1541B
Pleasant Pairs
brute force
,
implementation
,
math
,
number theory
1200
x26366
445A
DZY Loves Chessboard
dfs and similar
,
implementation
1200
x28108
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x29041
1328C
Ternary XOR
greedy
,
implementation
1200
x29303
459A
Pashmak and Garden
implementation
1200
x31301
1363A
Odd Selection
brute force
,
implementation
,
math
1200
x34263
433B
Kuriyama Mirai's Stones
dp
,
implementation
,
sortings
1200
x36150
327A
Flipping Game
brute force
,
dp
,
implementation
1200
x39855
474B
Worms
binary search
,
implementation
1200
x44558
514A
Chewbaсca and Number
greedy
,
implementation
1200
x45329
466A
Cheap Travel
implementation
1200
x59271
492B
Vanya and Lanterns
binary search
,
implementation
,
math
,
sortings
1200
x70860
188D
Asterisks
*special problem
,
implementation
1100
x647
162A
Pentagonal numbers
*special problem
,
implementation
1100
x789
100A
Carpeting the Room
*special problem
,
implementation
1100
x883
1910A
Username
*special problem
,
implementation
1100
x1532
292A
SMSC
implementation
1100
x2633
635A
Orchestra
brute force
,
implementation
1100
x2818
120B
Quiz League
implementation
1100
x3330
46B
T-shirts from Sponsor
implementation
1100
x3528
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3573
967A
Mind the Gap
implementation
1100
x4277
355B
Vasya and Public Transport
greedy
,
implementation
1100
x4424
366A
Dima and Guards
implementation
1100
x4477
136B
Ternary Logic
implementation
,
math
1100
x4639
475A
Bayan Bus
implementation
1100
x4680
68A
Irrational problem
implementation
,
number theory
1100
x4795
53A
Autocomplete
implementation
1100
x4819
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