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Before contest
Codeforces Round 941 (Div. 1)
22:25:43
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Before contest
Codeforces Round 941 (Div. 2)
22:25:43
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combinatorics
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2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
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expression parsing
fft
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geometry
graph matchings
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Custom test
Problems
#
Name
630C
Lucky Numbers
combinatorics
,
math
1100
x20349
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x966
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13089
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2647
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x526
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5279
621B
Wet Shark and Bishops
combinatorics
,
implementation
1300
x10775
617B
Chocolate
combinatorics
1300
x17285
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1578
610A
Pasha and Stick
combinatorics
,
math
1000
x21966
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6467
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2533
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2234
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1041
584B
Kolya and Tanya
combinatorics
1500
x11567
577B
Modulo Sum
combinatorics
,
data structures
,
dp
,
two pointers
1900
x11431
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1629
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2006
570E
Pig and Palindromes
combinatorics
,
dp
2300
x1801
568B
Symmetric and Transitive
combinatorics
,
dp
,
math
1900
x2219
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x423
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6129
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2132
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2094
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8367
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4351
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1722
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2701
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21553
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1791
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x347
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x6671
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x683
501E
Misha and Palindrome Degree
binary search
,
combinatorics
,
implementation
2500
x718
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3061
489F
Special Matrices
combinatorics
,
dp
2100
x1595
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6529
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x520
479E
Riding in a Lift
combinatorics
,
dp
1900
x4926
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x35175
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x28944
466D
Increase Sequence
combinatorics
,
dp
2100
x2831
459C
Pashmak and Buses
combinatorics
,
constructive algorithms
,
math
1900
x6062
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x38362
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x268
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1395
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3213
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4059
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1474
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1783
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2103
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2166
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x20720
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x951
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1061
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3965
396D
On Sum of Number of Inversions in Permutations
combinatorics
,
math
x406
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1460
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x574
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x2712
382E
Ksenia and Combinatorics
combinatorics
,
dp
2600
x366
380D
Sereja and Cinema
combinatorics
,
math
2500
x409
374B
Inna and Nine
combinatorics
,
greedy
1500
x3229
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x169
367E
Sereja and Intervals
combinatorics
,
dp
2700
x1063
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4590
360C
Levko and Strings
combinatorics
,
dp
2500
x1054
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1229
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2169
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2271
340E
Iahub and Permutations
combinatorics
,
math
2000
x2297
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4099
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x109
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x931
327E
Axis Walking
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
meet-in-the-middle
2300
x1340
327C
Magic Five
combinatorics
,
math
1700
x3108
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x745
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x715
322B
Ciel and Flowers
combinatorics
,
math
1600
x11472
319A
Malek Dance Club
combinatorics
,
math
1600
x2752
306C
White, Black and White Again
combinatorics
,
number theory
2100
x435
305D
Olya and Graph
combinatorics
,
math
2200
x452
300C
Beautiful Numbers
brute force
,
combinatorics
1800
x8841
296B
Yaroslav and Two Strings
combinatorics
,
dp
2000
x2052
295D
Greg and Caves
combinatorics
,
dp
2400
x634
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1654
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3706
293B
Distinct Paths
brute force
,
combinatorics
2700
x772
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x671
288B
Polo the Penguin and Houses
combinatorics
1500
x2844
285E
Positions in Permutations
combinatorics
,
dp
,
math
2600
x927
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1506
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x715
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1171
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2581
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1754
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1417
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16545
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x740
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1386
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