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Before contest
Codeforces Round 973 (Div. 2)
13:28:42
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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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Problems
#
Name
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1316
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x163
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x1001
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x908
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x447
747F
Igor and Interesting Numbers
brute force
,
combinatorics
,
dp
,
math
2500
x418
735C
Tennis Championship
combinatorics
,
constructive algorithms
,
greedy
,
math
1600
x7495
724F
Uniformly Branched Trees
combinatorics
,
dp
,
trees
2700
x401
722E
Research Rover
combinatorics
,
dp
2900
x866
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x349
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x356
712D
Memory and Scores
combinatorics
,
dp
,
math
2200
x1828
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4443
698F
Coprime Permutation
combinatorics
,
number theory
3000
x436
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2078
690D2
The Wall (medium)
combinatorics
1800
x1239
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1922
689C
Mike and Chocolate Thieves
binary search
,
combinatorics
,
math
1700
x5278
685A
Robbers' watch
brute force
,
combinatorics
,
dp
,
math
1700
x4218
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6392
666C
Codeword
combinatorics
,
strings
2500
x781
660E
Different Subsets For All Tuples
combinatorics
,
math
2300
x1497
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x1183
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x530
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3198
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x780
630I
Parking Lot
combinatorics
,
math
1700
x6677
630H
Benches
combinatorics
,
math
1400
x4935
630G
Challenge Pennants
combinatorics
,
math
1600
x2725
630F
Selection of Personnel
combinatorics
,
math
1300
x6784
630C
Lucky Numbers
combinatorics
,
math
1100
x21765
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x997
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13345
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2748
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x548
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5442
621B
Wet Shark and Bishops
combinatorics
,
implementation
1300
x10951
617B
Chocolate
combinatorics
1300
x17815
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1678
610A
Pasha and Stick
combinatorics
,
math
1000
x23051
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6794
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2568
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2248
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1066
584B
Kolya and Tanya
combinatorics
1500
x11903
577B
Modulo Sum
combinatorics
,
data structures
,
dp
,
two pointers
1900
x12072
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1673
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2318
570E
Pig and Palindromes
combinatorics
,
dp
2300
x1887
568B
Symmetric and Transitive
combinatorics
,
dp
,
math
1900
x2240
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x435
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6442
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2195
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2110
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8624
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4468
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1956
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2808
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x22372
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1867
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x367
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x6941
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x731
501E
Misha and Palindrome Degree
binary search
,
combinatorics
,
implementation
2500
x914
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3111
489F
Special Matrices
combinatorics
,
dp
2100
x1663
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6662
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x531
479E
Riding in a Lift
combinatorics
,
dp
1900
x5102
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x36391
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x30434
466D
Increase Sequence
combinatorics
,
dp
2100
x3168
459C
Pashmak and Buses
combinatorics
,
constructive algorithms
,
math
1900
x6169
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x40097
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x278
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1618
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3587
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4371
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1562
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1878
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2312
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2216
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x22101
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x988
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1098
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x4141
396D
On Sum of Number of Inversions in Permutations
combinatorics
,
math
x421
396A
On Number of Decompositions into Multipliers
combinatorics
,
math
,
number theory
x1501
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x589
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x3032
382E
Ksenia and Combinatorics
combinatorics
,
dp
2600
x378
380D
Sereja and Cinema
combinatorics
,
math
2500
x462
374B
Inna and Nine
combinatorics
,
greedy
1500
x3283
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x170
367E
Sereja and Intervals
combinatorics
,
dp
2700
x1115
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4663
360C
Levko and Strings
combinatorics
,
dp
2500
x1106
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1261
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2275
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2370
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