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Before contest
Codeforces Round 972 (Div. 2)
42:08:39
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→ Filter Problems
Difficulty:
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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
1068A
Birthday
math
1400
x6782
1066C
Books Queries
implementation
1400
x9601
1061B
Views Matter
greedy
,
implementation
,
sortings
1400
x7281
1057B
DDoS
*special problem
,
brute force
1400
x1824
1046F
Splitting money
implementation
1400
x2755
1046C
Space Formula
greedy
1400
x3094
1009B
Minimum Ternary String
greedy
,
implementation
1400
x10056
1004C
Sonya and Robots
constructive algorithms
,
implementation
1400
x7518
1001G
Oracle for f(x) = k-th element of x
*special problem
1400
x537
1001D
Distinguish plus state and minus state
*special problem
1400
x682
1001C
Generate GHZ state
*special problem
1400
x653
1001B
Generate Bell state
*special problem
1400
x711
995B
Suit and Tie
greedy
,
implementation
,
math
1400
x7067
994B
Knights of a Polygonal Table
greedy
,
implementation
,
sortings
1400
x5632
988C
Equal Sums
implementation
,
sortings
1400
x10127
987C
Three displays
brute force
,
dp
,
implementation
1400
x13423
981C
Useful Decomposition
implementation
,
trees
1400
x5368
978E
Bus Video System
combinatorics
,
math
1400
x9501
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x18220
975C
Valhalla Siege
binary search
1400
x9590
962C
Make a Square
brute force
,
implementation
,
math
1400
x7812
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5286
958D1
Hyperspace Jump (easy)
expression parsing
,
math
1400
x2060
958A1
Death Stars (easy)
implementation
1400
x1652
955B
Not simply beatiful strings
implementation
1400
x4807
954B
String Typing
implementation
,
strings
1400
x7230
940B
Our Tanya is Crying Out Loud
dp
,
greedy
1400
x8956
937B
Vile Grasshoppers
brute force
,
math
,
number theory
1400
x6868
934A
A Compatible Pair
brute force
,
games
1400
x6965
929A
Прокат велосипедов
*special problem
,
greedy
,
implementation
1400
x2494
928B
Chat
*special problem
,
dp
1400
x2529
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x9152
911C
Three Garlands
brute force
,
constructive algorithms
1400
x7018
907B
Tic-Tac-Toe
implementation
1400
x4055
898C
Phone Numbers
implementation
,
strings
1400
x5260
888C
K-Dominant Character
binary search
,
implementation
,
two pointers
1400
x8203
868B
Race Against Time
implementation
1400
x3668
865A
Save the problem!
constructive algorithms
1400
x4322
851B
Arpa and an exam about geometry
geometry
,
math
1400
x5480
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5612
838A
Binary Blocks
brute force
1400
x920
816B
Karen and Coffee
binary search
,
data structures
,
implementation
1400
x17681
808C
Tea Party
constructive algorithms
,
greedy
,
sortings
1400
x6128
804B
Minimum number of steps
combinatorics
,
greedy
,
implementation
,
math
1400
x9607
803A
Maximal Binary Matrix
constructive algorithms
1400
x4832
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4542
799B
T-shirt buying
data structures
,
implementation
1400
x8743
797B
Odd sum
dp
,
greedy
,
implementation
1400
x10485
770D
Draw Brackets!
*special problem
,
implementation
1400
x1569
762B
USB vs. PS/2
greedy
,
implementation
,
sortings
,
two pointers
1400
x7999
762A
k-th divisor
math
,
number theory
1400
x19438
757B
Bash's Big Day
greedy
,
math
,
number theory
1400
x10182
748C
Santa Claus and Robot
constructive algorithms
,
math
1400
x4598
745B
Hongcow Solves A Puzzle
implementation
1400
x3735
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x7305
719B
Anatoly and Cockroaches
greedy
1400
x8455
713A
Sonya and Queries
data structures
,
implementation
1400
x8444
711B
Chris and Magic Square
constructive algorithms
,
implementation
1400
x8407
710B
Optimal Point on a Line
brute force
,
sortings
1400
x8731
703B
Mishka and trip
implementation
,
math
1400
x5669
699B
One Bomb
implementation
1400
x7574
698A
Vacations
dp
1400
x29921
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5695
689A
Mike and Cellphone
brute force
,
constructive algorithms
,
implementation
1400
x5244
683D
Chocolate Bar
*special problem
,
math
1400
x322
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12898
677B
Vanya and Food Processor
implementation
,
math
1400
x7608
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7363
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x17487
665B
Shopping
brute force
1400
x3525
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4619
650A
Watchmen
data structures
,
geometry
,
math
1400
x15391
649B
Этажи
constructive algorithms
1400
x528
641B
Little Artem and Matrix
implementation
1400
x3979
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2417
632B
Alice, Bob, Two Teams
brute force
,
constructive algorithms
1400
x3975
630L
Cracking the Code
implementation
,
math
1400
x3549
630H
Benches
combinatorics
,
math
1400
x4928
614B
Gena's Code
implementation
,
math
1400
x6885
612C
Replace To Make Regular Bracket Sequence
data structures
,
expression parsing
,
math
1400
x7951
604B
More Cowbell
binary search
,
greedy
1400
x8406
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x10745
581C
Developing Skills
implementation
,
math
,
sortings
1400
x7309
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x20779
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8403
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x17466
544B
Sea and Islands
constructive algorithms
,
implementation
1400
x7975
538B
Quasi Binary
constructive algorithms
,
dp
,
greedy
,
implementation
1400
x17943
538A
Cutting Banner
brute force
,
implementation
1400
x7107
534B
Covered Path
dp
,
greedy
,
math
1400
x10137
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4489
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9343
523C
Name Quest
*special problem
,
greedy
1400
x2487
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x50437
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x7941
515C
Drazil and Factorial
greedy
,
math
,
sortings
1400
x25792
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20688
513B1
Permutations
brute force
1400
x3614
507B
Amr and Pins
geometry
,
math
1400
x24437
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x12812
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