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Codeforces Round 988 (Div. 3)
46:15:19
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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
926C
Is This a Zebra?
implementation
1700
x1887
926B
Add Points
math
,
number theory
1800
x1713
926A
2-3-numbers
implementation
,
math
1300
x3812
925B
Resource Distribution
binary search
,
implementation
,
sortings
1700
x2207
925A
Stairs and Elevators
binary search
1600
x3479
924C
Riverside Curio
data structures
,
dp
,
greedy
1700
x3872
924B
Three-level Laser
binary search
,
greedy
,
two pointers
1600
x5293
924A
Mystical Mosaic
greedy
,
implementation
1300
x5051
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4304
923B
Producing Snow
binary search
,
data structures
1600
x7333
923A
Primal Sport
math
,
number theory
1700
x5038
922D
Robot Vacuum Cleaner
greedy
,
sortings
1800
x4394
922C
Cave Painting
brute force
,
number theory
1600
x7139
922B
Magic Forest
brute force
1300
x8522
922A
Cloning Toys
implementation
1300
x11702
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x9239
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x10137
919C
Seat Arrangements
brute force
,
implementation
1300
x8994
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3542
917A
The Monster
dp
,
greedy
,
implementation
,
math
1800
x3527
916C
Jamie and Interesting Graph
constructive algorithms
,
graphs
,
shortest paths
1600
x5124
915C
Permute Digits
dp
,
greedy
1700
x7089
915B
Browser
implementation
1300
x7793
914D
Bash and a Tough Math Puzzle
data structures
,
number theory
1900
x5345
914C
Travelling Salesman and Special Numbers
brute force
,
combinatorics
,
dp
1800
x3836
913D
Too Easy Problems
binary search
,
brute force
,
data structures
,
greedy
,
sortings
1800
x4746
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x7944
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x12111
911D
Inversion Counting
brute force
,
math
1800
x4610
911C
Three Garlands
brute force
,
constructive algorithms
1400
x7050
910C
Minimum Sum
constructive algorithms
,
greedy
,
math
1700
x1812
910B
Door Frames
greedy
,
implementation
1600
x1708
909E
Coprocessor
dfs and similar
,
dp
,
graphs
,
greedy
1900
x2112
909C
Python Indentation
dp
1800
x4948
909B
Segments
constructive algorithms
,
math
1300
x6418
908C
New Year and Curling
brute force
,
geometry
,
implementation
,
math
1500
x6930
907B
Tic-Tac-Toe
implementation
1400
x4069
907A
Masha and Bears
brute force
,
implementation
1300
x5708
906A
Shockers
implementation
,
strings
1600
x4138
901A
Hashing Trees
constructive algorithms
,
trees
1500
x5128
900C
Remove Extra One
brute force
,
data structures
,
math
1700
x4571
900B
Position in Fraction
math
,
number theory
1300
x7863
899D
Shovel Sale
constructive algorithms
,
math
1800
x2768
899C
Dividing the numbers
constructive algorithms
,
graphs
,
math
1300
x8500
898E
Squares and not squares
constructive algorithms
,
greedy
1600
x4600
898D
Alarm Clock
greedy
1600
x3969
898C
Phone Numbers
implementation
,
strings
1400
x5303
897B
Chtholly's request
brute force
1300
x7200
896A
Nephren gives a riddle
binary search
,
dfs and similar
1700
x3468
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3548
894C
Marco and GCD Sequence
constructive algorithms
,
math
1900
x4378
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4478
893D
Credit Card
data structures
,
dp
,
greedy
,
implementation
1900
x3066
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x23534
891A
Pride
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10290
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x7358
888D
Almost Identity Permutations
combinatorics
,
dp
,
math
1600
x8477
888C
K-Dominant Character
binary search
,
implementation
,
two pointers
1400
x8264
887C
Solution for Cube
brute force
,
implementation
1500
x2899
887B
Cubes for Masha
brute force
,
implementation
1300
x5640
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5481
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x4745
883K
Road Widening
constructive algorithms
,
greedy
,
implementation
1800
x1102
883I
Photo Processing
binary search
,
dp
1900
x2012
883H
Palindromic Cut
brute force
,
implementation
,
strings
1800
x1620
883G
Orientation of Edges
dfs and similar
,
graphs
1900
x1422
883F
Lost in Transliteration
implementation
1300
x2282
883E
Field of Wonders
implementation
,
strings
1500
x1911
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5538
877C
Slava and tanks
constructive algorithms
1600
x5728
877B
Nikita and string
brute force
,
dp
1500
x10528
876B
Divisiblity of Differences
implementation
,
math
,
number theory
1300
x9214
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5204
873D
Merge Sort
constructive algorithms
,
divide and conquer
1800
x3182
873C
Strange Game On Matrix
greedy
,
two pointers
1600
x3276
873B
Balanced Substring
dp
,
implementation
1500
x7842
870C
Maximum splitting
dp
,
greedy
,
math
,
number theory
1300
x9227
869C
The Intriguing Obsession
combinatorics
,
dp
,
math
1800
x4728
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4633
868B
Race Against Time
implementation
1400
x3684
865B
Ordering Pizza
binary search
,
sortings
,
ternary search
1900
x1867
865A
Save the problem!
constructive algorithms
1400
x4332
864D
Make a Permutation!
greedy
,
implementation
,
math
1500
x6011
864C
Bus
greedy
,
implementation
,
math
1500
x5866
863D
Yet Another Array Queries Problem
data structures
,
implementation
1800
x3294
863C
1-2-3
graphs
,
implementation
1800
x2515
863B
Kayaking
brute force
,
greedy
,
sortings
1500
x8402
862C
Mahmoud and Ehab and the xor
constructive algorithms
1900
x4098
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x18269
859C
Pie Rules
dp
,
games
1500
x5430
858D
Polycarp's phone book
data structures
,
implementation
,
sortings
1600
x3850
858C
Did you mean...
dp
,
greedy
,
implementation
1500
x5636
858B
Which floor?
brute force
,
implementation
1500
x3746
856A
Set Theory
brute force
,
constructive algorithms
1600
x1442
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8732
853B
Jury Meeting
greedy
,
sortings
,
two pointers
1800
x2533
853A
Planning
greedy
1500
x5858
852G
Bathroom terminal
implementation
1700
x1290
851B
Arpa and an exam about geometry
geometry
,
math
1400
x5561
850A
Five Dimensional Points
brute force
,
geometry
,
math
1700
x3213
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