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Before contest
Codeforces Round 988 (Div. 3)
30:02:49
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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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Problems
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Status
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Custom test
Problems
#
Name
899D
Shovel Sale
constructive algorithms
,
math
1800
x2768
899C
Dividing the numbers
constructive algorithms
,
graphs
,
math
1300
x8500
899B
Months and Years
implementation
1200
x5899
899A
Splitting in Teams
constructive algorithms
,
greedy
,
math
800
x10262
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1198
898E
Squares and not squares
constructive algorithms
,
greedy
1600
x4602
898D
Alarm Clock
greedy
1600
x3971
898C
Phone Numbers
implementation
,
strings
1400
x5303
898B
Proper Nutrition
brute force
,
implementation
,
number theory
1100
x9607
898A
Rounding
implementation
,
math
800
x16290
897B
Chtholly's request
brute force
1300
x7200
897A
Scarborough Fair
implementation
800
x14259
896E
Welcome home, Chtholly
data structures
,
dsu
3100
x2150
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x537
896C
Willem, Chtholly and Seniorious
data structures
,
probabilities
2600
x3472
896B
Ithea Plays With Chtholly
binary search
,
constructive algorithms
,
games
,
greedy
,
interactive
2000
x2129
896A
Nephren gives a riddle
binary search
,
dfs and similar
1700
x3468
895E
Eyes Closed
data structures
,
probabilities
2300
x1122
895D
String Mark
combinatorics
,
math
,
strings
2100
x1117
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5627
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3549
895A
Pizza Separation
brute force
,
implementation
1200
x6571
894E
Ralph and Mushrooms
dp
,
graphs
2100
x2357
894D
Ralph And His Tour in Binary Country
brute force
,
data structures
,
trees
2200
x1136
894C
Marco and GCD Sequence
constructive algorithms
,
math
1900
x4378
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4478
894A
QAQ
brute force
,
dp
800
x34942
893F
Subtree Minimum Query
data structures
,
trees
2300
x2004
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x3715
893D
Credit Card
data structures
,
dp
,
greedy
,
implementation
1900
x3066
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x23543
893B
Beautiful Divisors
brute force
,
implementation
1000
x11484
893A
Chess For Three
implementation
900
x10271
892B
Wrath
greedy
,
implementation
,
two pointers
1200
x9042
892A
Greed
greedy
,
implementation
900
x13604
891E
Lust
combinatorics
,
math
,
matrices
3000
x939
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x194
891C
Envy
data structures
,
dsu
,
graphs
2300
x2413
891B
Gluttony
constructive algorithms
,
greedy
2000
x3012
891A
Pride
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10291
889E
Mod Mod Mod
binary search
,
dp
,
math
3000
x562
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x4578
888F
Connecting Vertices
dp
,
graphs
2500
x836
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x7360
888D
Almost Identity Permutations
combinatorics
,
dp
,
math
1600
x8480
888C
K-Dominant Character
binary search
,
implementation
,
two pointers
1400
x8264
888B
Buggy Robot
greedy
1000
x9798
888A
Local Extrema
brute force
,
implementation
800
x11008
887F
Row of Models
greedy
,
sortings
2500
x166
887E
Little Brother
binary search
,
geometry
,
sortings
2800
x163
887D
Ratings and Reality Shows
data structures
,
two pointers
2400
x480
887C
Solution for Cube
brute force
,
implementation
1500
x2899
887B
Cubes for Masha
brute force
,
implementation
1300
x5640
887A
Div. 64
implementation
1000
x11288
886F
Symmetric Projections
geometry
2900
x268
886E
Maximum Element
combinatorics
,
dp
,
math
2400
x1027
886D
Restoration of string
constructive algorithms
,
graphs
,
implementation
2000
x1802
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5481
886B
Vlad and Cafes
1000
x7925
886A
ACM ICPC
brute force
1000
x10338
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x1070
884E
Binary Matrix
dsu
2500
x696
884D
Boxes And Balls
data structures
,
greedy
2300
x2037
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x4745
884B
Japanese Crosswords Strike Back
implementation
1100
x6886
884A
Book Reading
implementation
800
x10497
883M
Quadcopter Competition
greedy
,
math
1100
x3603
883L
Berland.Taxi
data structures
2500
x233
883K
Road Widening
constructive algorithms
,
greedy
,
implementation
1800
x1102
883J
Renovation
constructive algorithms
,
greedy
,
sortings
2400
x580
883I
Photo Processing
binary search
,
dp
1900
x2018
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
883D
Packmen Strike Back
binary search
,
dp
,
math
2500
x432
883C
Downloading B++
binary search
,
implementation
2300
x629
883B
Berland Army
constructive algorithms
,
graphs
,
greedy
2600
x378
883A
Automatic Door
implementation
2200
x592
879B
Table Tennis
data structures
,
implementation
1200
x12470
879A
Borya's Diagnosis
implementation
900
x9092
878E
Numbers on the blackboard
combinatorics
,
dp
3300
x571
878D
Magic Breeding
bitmasks
2900
x680
878C
Tournament
data structures
,
graphs
2700
x927
878B
Teams Formation
data structures
,
implementation
2300
x1070
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5538
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1828
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4575
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x4401
877C
Slava and tanks
constructive algorithms
1600
x5728
877B
Nikita and string
brute force
,
dp
1500
x10528
877A
Alex and broken contest
implementation
,
strings
1100
x10889
876B
Divisiblity of Differences
implementation
,
math
,
number theory
1300
x9214
876A
Trip For Meal
math
900
x9399
875F
Royal Questions
dsu
,
graphs
,
greedy
2500
x1358
875E
Delivery Club
binary search
,
data structures
,
dp
2600
x923
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x2283
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x2133
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5204
875A
Classroom Watch
brute force
,
math
1200
x9644
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