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Before contest
Codeforces Round 945 (Div. 2)
46:59:37
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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
630I
Parking Lot
combinatorics
,
math
1700
x6306
630H
Benches
combinatorics
,
math
1400
x4745
630G
Challenge Pennants
combinatorics
,
math
1600
x2632
630F
Selection of Personnel
combinatorics
,
math
1300
x6583
630C
Lucky Numbers
combinatorics
,
math
1100
x20436
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x969
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13127
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2652
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x533
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5296
621B
Wet Shark and Bishops
combinatorics
,
implementation
1300
x10792
617B
Chocolate
combinatorics
1300
x17343
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1582
610A
Pasha and Stick
combinatorics
,
math
1000
x22051
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6482
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2535
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2234
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1043
584B
Kolya and Tanya
combinatorics
1500
x11598
577B
Modulo Sum
combinatorics
,
data structures
,
dp
,
two pointers
1900
x11504
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1631
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2009
570E
Pig and Palindromes
combinatorics
,
dp
2300
x1810
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
x6160
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2138
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2094
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8383
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4356
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1723
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2705
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21662
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1810
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x352
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x6694
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x685
501E
Misha and Palindrome Degree
binary search
,
combinatorics
,
implementation
2500
x719
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3066
489F
Special Matrices
combinatorics
,
dp
2100
x1597
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6545
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x520
479E
Riding in a Lift
combinatorics
,
dp
1900
x4937
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x35318
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x29092
466D
Increase Sequence
combinatorics
,
dp
2100
x2842
459C
Pashmak and Buses
combinatorics
,
constructive algorithms
,
math
1900
x6071
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x38524
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x269
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1395
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3247
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4092
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1477
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1793
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2105
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2174
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x20892
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x955
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1066
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3971
396D
On Sum of Number of Inversions in Permutations
combinatorics
,
math
x406
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1461
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x579
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x2742
382E
Ksenia and Combinatorics
combinatorics
,
dp
2600
x368
380D
Sereja and Cinema
combinatorics
,
math
2500
x411
374B
Inna and Nine
combinatorics
,
greedy
1500
x3234
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x169
367E
Sereja and Intervals
combinatorics
,
dp
2700
x1070
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4605
360C
Levko and Strings
combinatorics
,
dp
2500
x1063
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1229
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2175
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2283
340E
Iahub and Permutations
combinatorics
,
math
2000
x2300
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4110
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
x934
327E
Axis Walking
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
meet-in-the-middle
2300
x1349
327C
Magic Five
combinatorics
,
math
1700
x3112
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x752
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x719
322B
Ciel and Flowers
combinatorics
,
math
1600
x11504
319A
Malek Dance Club
combinatorics
,
math
1600
x2757
306C
White, Black and White Again
combinatorics
,
number theory
2100
x441
305D
Olya and Graph
combinatorics
,
math
2200
x453
300C
Beautiful Numbers
brute force
,
combinatorics
1800
x8882
296B
Yaroslav and Two Strings
combinatorics
,
dp
2000
x2079
295D
Greg and Caves
combinatorics
,
dp
2400
x636
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1657
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3719
293B
Distinct Paths
brute force
,
combinatorics
2700
x773
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x675
288B
Polo the Penguin and Houses
combinatorics
1500
x2846
285E
Positions in Permutations
combinatorics
,
dp
,
math
2600
x936
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1511
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x718
272E
Dima and Horses
combinatorics
,
constructive algorithms
,
graphs
2200
x1171
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2584
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1757
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