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Before contest
Codeforces Round 986 (Div. 2)
05:47:26
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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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Problems
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Status
Standings
Custom test
Problems
#
Name
494A
Treasure
greedy
1500
x6255
493E
Vasya and Polynomial
math
2800
x485
493D
Vasya and Chess
constructive algorithms
,
games
,
math
1700
x9709
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6833
493B
Vasya and Wrestling
implementation
1400
x13367
493A
Vasya and Football
implementation
1300
x6122
492E
Vanya and Field
math
2000
x1630
492D
Vanya and Computer Game
binary search
,
implementation
,
math
,
sortings
1800
x3158
492C
Vanya and Exams
greedy
,
sortings
1400
x14132
492B
Vanya and Lanterns
binary search
,
implementation
,
math
,
sortings
1200
x76237
492A
Vanya and Cubes
implementation
800
x51029
491C
Deciphering
flows
,
graph matchings
2300
x415
491B
New York Hotel
greedy
,
math
2100
x567
491A
Up the hill
constructive algorithms
,
implementation
1000
x2949
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1706
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1602
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2144
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x9099
490B
Queue
dsu
,
implementation
1500
x6011
490A
Team Olympiad
greedy
,
implementation
,
sortings
800
x59852
489F
Special Matrices
combinatorics
,
dp
2100
x1673
489E
Hiking
binary search
,
dp
2300
x1033
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6704
489C
Given Length and Sum of Digits...
dp
,
greedy
,
implementation
1400
x46489
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x49309
489A
SwapSort
greedy
,
implementation
,
sortings
1200
x10089
488B
Candy Boxes
brute force
,
constructive algorithms
,
math
1900
x2125
488A
Giga Tower
brute force
1100
x14300
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2372
487D
Conveyor Belts
data structures
2700
x901
487C
Prefix Product Sequence
constructive algorithms
,
math
,
number theory
2300
x2790
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3535
487A
Fight the Monster
binary search
,
brute force
,
implementation
1800
x3769
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2280
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x4042
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x11766
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x17718
486A
Calculating Function
implementation
,
math
800
x120181
485B
Valuable Resources
brute force
,
greedy
1300
x6539
485A
Factory
implementation
,
math
,
matrices
1400
x8300
484E
Sign on Fence
binary search
,
constructive algorithms
,
data structures
2500
x2339
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2629
484C
Strange Sorting
implementation
,
math
2600
x592
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x7068
484A
Bits
bitmasks
,
constructive algorithms
1700
x11446
483B
Friends and Presents
binary search
,
math
1800
x4088
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x23173
482E
ELCA
data structures
,
trees
3200
x177
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x535
482C
Game with Strings
bitmasks
,
dp
,
probabilities
2600
x929
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6561
482A
Diverse Permutation
constructive algorithms
,
greedy
1200
x9660
480E
Parking Lot
data structures
,
divide and conquer
2800
x568
480D
Parcels
dp
,
graphs
2600
x460
479E
Riding in a Lift
combinatorics
,
dp
1900
x5161
479D
Long Jumps
binary search
,
greedy
,
implementation
1700
x4794
479C
Exams
greedy
,
sortings
1400
x29820
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7918
479A
Expression
brute force
,
math
1000
x94932
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x221
478D
Red-Green Towers
dp
2000
x6027
478C
Table Decorations
greedy
1800
x18340
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x36800
478A
Initial Bet
implementation
1100
x25733
477E
Dreamoon and Notepad
data structures
3100
x135
477D
Dreamoon and Binary
dp
,
strings
2700
x526
476E
Dreamoon and Strings
dp
,
strings
2200
x1972
476D
Dreamoon and Sets
constructive algorithms
,
greedy
,
math
1900
x4681
476C
Dreamoon and Sums
math
1600
x5750
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x31028
476A
Dreamoon and Stairs
implementation
,
math
1000
x44226
475F
Meta-universe
data structures
2900
x230
475E
Strongly Connected City 2
dfs and similar
2700
x412
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4954
475C
Kamal-ol-molk's Painting
brute force
,
constructive algorithms
,
greedy
2100
x786
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8509
475A
Bayan Bus
implementation
1100
x4771
474F
Ant colony
data structures
,
math
,
number theory
2100
x8769
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3383
474D
Flowers
dp
1700
x25476
474C
Captain Marmot
brute force
,
geometry
2000
x3128
474B
Worms
binary search
,
implementation
1200
x48905
474A
Keyboard
implementation
900
x45949
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x404
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x258
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x131
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x5436
472C
Design Tutorial: Make It Nondeterministic
greedy
1400
x6365
472B
Design Tutorial: Learn from Life
1300
x7422
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x60500
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x82
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x8227
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3568
471B
MUH and Important Things
implementation
,
sortings
1300
x5958
471A
MUH and Sticks
implementation
1100
x13432
470H
Array Sorting
*special problem
2300
x189
470G
Hamming Distance
*special problem
2300
x95
470F
Pairwise Sums
*special problem
2300
x106
470E
Chessboard
*special problem
1900
x198
470D
Caesar Cipher
*special problem
1900
x153
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