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Before contest
Codeforces Round 941 (Div. 1)
21:48:42
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
21:48:42
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→ Filter Problems
Difficulty:
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combinatorics
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
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30954
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x26022
1674B
Dictionary
combinatorics
,
math
800
x25567
1499A
Domino on Windowsill
combinatorics
,
constructive algorithms
,
math
800
x21004
1821A
Matching
combinatorics
,
math
800
x19316
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18345
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15772
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13237
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13089
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x23579
1543B
Customising the Track
combinatorics
,
greedy
,
math
900
x22631
1771A
Hossam and Combinatorics
combinatorics
,
math
,
sortings
900
x21985
1582B
Luntik and Subsequences
combinatorics
,
math
900
x18715
1777B
Emordnilap
combinatorics
,
greedy
,
math
900
x16552
1166A
Silent Classroom
combinatorics
,
greedy
900
x13874
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24414
1674C
Infinite Replacement
combinatorics
,
implementation
,
strings
1000
x22850
610A
Pasha and Stick
combinatorics
,
math
1000
x21966
1293B
JOE is on TV!
combinatorics
,
greedy
,
math
1000
x20768
1539A
Contest Start
combinatorics
,
geometry
,
greedy
,
math
1000
x19572
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14383
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21553
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21408
630C
Lucky Numbers
combinatorics
,
math
1100
x20349
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19217
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17384
1574B
Combinatorics Homework
combinatorics
,
greedy
,
math
1100
x17000
1272C
Yet Another Broken Keyboard
combinatorics
,
dp
,
implementation
1200
x25008
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x22630
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x18848
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x16960
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x38363
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x35175
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x28944
1328B
K-th Beautiful String
binary search
,
brute force
,
combinatorics
,
implementation
,
math
1300
x28036
1433E
Two Round Dances
combinatorics
,
math
1300
x17991
617B
Chocolate
combinatorics
1300
x17285
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16545
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x15931
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15617
1326C
Permutation Partitions
combinatorics
,
greedy
,
math
1300
x15209
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x14802
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12472
1007A
Reorder the Array
combinatorics
,
data structures
,
math
,
sortings
,
two pointers
1300
x11973
1178C
Tiles
combinatorics
,
greedy
,
math
1300
x11276
1594E1
Rubik's Cube Coloring (easy version)
combinatorics
,
math
1300
x10843
621B
Wet Shark and Bishops
combinatorics
,
implementation
1300
x10775
1096B
Substring Removal
combinatorics
,
math
,
strings
1300
x10325
844B
Rectangles
combinatorics
,
math
1300
x6977
840A
Leha and Function
combinatorics
,
greedy
,
math
,
number theory
,
sortings
1300
x6953
630F
Selection of Personnel
combinatorics
,
math
1300
x6543
171B
Star
*special problem
,
combinatorics
1300
x3935
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x20720
1475C
Ball in Berland
combinatorics
,
graphs
,
math
1400
x19906
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x13690
1215B
The Number of Products
combinatorics
,
dp
,
implementation
1400
x12041
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11690
131C
The World is a Theatre
combinatorics
,
math
1400
x10617
1284B
New Year and Ascent Sequence
binary search
,
combinatorics
,
data structures
,
dp
,
implementation
,
sortings
1400
x10580
152C
Pocket Book
combinatorics
1400
x10245
804B
Minimum number of steps
combinatorics
,
greedy
,
implementation
,
math
1400
x9512
978E
Bus Video System
combinatorics
,
math
1400
x9207
1762C
Binary Strings are Fun
combinatorics
,
math
1400
x8819
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7167
630H
Benches
combinatorics
,
math
1400
x4733
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3742
1552B
Running for Gold
combinatorics
,
graphs
,
greedy
,
sortings
1500
x14943
1391C
Cyclic Permutations
combinatorics
,
dp
,
graphs
,
math
1500
x14529
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13169
1569C
Jury Meeting
combinatorics
,
math
1500
x11630
584B
Kolya and Tanya
combinatorics
1500
x11567
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x11130
1236B
Alice and the List of Presents
combinatorics
,
math
1500
x10623
1436C
Binary Search
binary search
,
combinatorics
1500
x10517
1105C
Ayoub and Lost Array
combinatorics
,
dp
,
math
1500
x10111
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x9900
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x9381
1739C
Card Game
combinatorics
,
constructive algorithms
,
dp
,
games
1500
x8683
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8367
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8027
1195D1
Submarine in the Rybinsk Sea (easy edition)
combinatorics
,
math
,
number theory
1500
x7659
1084C
The Fair Nut and String
combinatorics
,
dp
,
implementation
1500
x7504
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7444
1081C
Colorful Bricks
combinatorics
,
dp
,
math
1500
x6983
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6467
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6271
817B
Makes And The Product
combinatorics
,
implementation
,
math
,
sortings
1500
x5544
204A
Little Elephant and Interval
binary search
,
combinatorics
,
dp
1500
x5519
374B
Inna and Nine
combinatorics
,
greedy
1500
x3229
288B
Polo the Penguin and Houses
combinatorics
1500
x2844
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x13536
1475E
Advertising Agency
combinatorics
,
math
,
sortings
1600
x12839
1288C
Two Arrays
combinatorics
,
dp
1600
x12260
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11818
322B
Ciel and Flowers
combinatorics
,
math
1600
x11473
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x8697
1795D
Triangle Coloring
combinatorics
,
math
1600
x8422
1452D
Radio Towers
combinatorics
,
dp
,
math
1600
x7745
1284C
New Year and Permutation
combinatorics
,
math
1600
x7702
888D
Almost Identity Permutations
combinatorics
,
dp
,
math
1600
x7590
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