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Before contest
Educational Codeforces Round 167 (Rated for Div. 2)
37:55:17
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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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Custom test
Problems
#
Name
492D
Vanya and Computer Game
binary search
,
implementation
,
math
,
sortings
1800
x3131
492C
Vanya and Exams
greedy
,
sortings
1400
x13782
492B
Vanya and Lanterns
binary search
,
implementation
,
math
,
sortings
1200
x72500
492A
Vanya and Cubes
implementation
800
x47804
491C
Deciphering
flows
,
graph matchings
2300
x403
491B
New York Hotel
greedy
,
math
2100
x540
491A
Up the hill
constructive algorithms
,
implementation
1000
x2841
490F
Treeland Tour
data structures
,
dfs and similar
,
dp
,
trees
2200
x1579
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1564
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2074
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x8964
490B
Queue
dsu
,
implementation
1500
x5925
490A
Team Olympiad
greedy
,
implementation
,
sortings
800
x56660
489F
Special Matrices
combinatorics
,
dp
2100
x1606
489E
Hiking
binary search
,
dp
2300
x1003
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6570
489C
Given Length and Sum of Digits...
dp
,
greedy
,
implementation
1400
x45047
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x47238
489A
SwapSort
greedy
,
implementation
,
sortings
1200
x9875
488B
Candy Boxes
brute force
,
constructive algorithms
,
math
1900
x2092
488A
Giga Tower
brute force
1100
x14109
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2176
487D
Conveyor Belts
data structures
2700
x841
487C
Prefix Product Sequence
constructive algorithms
,
math
,
number theory
2300
x2576
487B
Strip
binary search
,
data structures
,
dp
,
two pointers
2000
x3391
487A
Fight the Monster
binary search
,
brute force
,
implementation
1800
x3692
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2161
486D
Valid Sets
dfs and similar
,
dp
,
math
,
trees
2100
x3868
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x11569
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x17134
486A
Calculating Function
implementation
,
math
800
x111756
485B
Valuable Resources
brute force
,
greedy
1300
x6468
485A
Factory
implementation
,
math
,
matrices
1400
x8131
484E
Sign on Fence
binary search
,
constructive algorithms
,
data structures
2500
x2196
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2466
484C
Strange Sorting
implementation
,
math
2600
x584
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x6827
484A
Bits
bitmasks
,
constructive algorithms
1700
x10886
483B
Friends and Presents
binary search
,
math
1800
x4009
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x22481
482E
ELCA
data structures
,
trees
3200
x176
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x524
482C
Game with Strings
bitmasks
,
dp
,
probabilities
2600
x884
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6241
482A
Diverse Permutation
constructive algorithms
,
greedy
1200
x9556
480E
Parking Lot
data structures
,
divide and conquer
2800
x517
480D
Parcels
dp
,
graphs
2600
x456
479E
Riding in a Lift
combinatorics
,
dp
1900
x4981
479D
Long Jumps
binary search
,
greedy
,
implementation
1700
x4723
479C
Exams
greedy
,
sortings
1400
x28886
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7634
479A
Expression
brute force
,
math
1000
x90436
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x207
478D
Red-Green Towers
dp
2000
x5520
478C
Table Decorations
greedy
1800
x17677
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x35688
478A
Initial Bet
implementation
1100
x25181
477E
Dreamoon and Notepad
data structures
3100
x132
477D
Dreamoon and Binary
dp
,
strings
2700
x520
476E
Dreamoon and Strings
dp
,
strings
2200
x1769
476D
Dreamoon and Sets
constructive algorithms
,
greedy
,
math
1900
x4348
476C
Dreamoon and Sums
math
1600
x5421
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x29547
476A
Dreamoon and Stairs
implementation
,
math
1000
x41967
475F
Meta-universe
data structures
2900
x227
475E
Strongly Connected City 2
dfs and similar
2700
x405
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4604
475C
Kamal-ol-molk's Painting
brute force
,
constructive algorithms
,
greedy
2100
x778
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8313
475A
Bayan Bus
implementation
1100
x4722
474F
Ant colony
data structures
,
math
,
number theory
2100
x7972
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3182
474D
Flowers
dp
1700
x24302
474C
Captain Marmot
brute force
,
geometry
2000
x3082
474B
Worms
binary search
,
implementation
1200
x45745
474A
Keyboard
implementation
900
x43549
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x394
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x250
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x130
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x5100
472C
Design Tutorial: Make It Nondeterministic
greedy
1400
x6325
472B
Design Tutorial: Learn from Life
1300
x7384
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x57875
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x81
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x7615
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3542
471B
MUH and Important Things
implementation
,
sortings
1300
x5906
471A
MUH and Sticks
implementation
1100
x13362
470H
Array Sorting
*special problem
2300
x186
470G
Hamming Distance
*special problem
2300
x94
470F
Pairwise Sums
*special problem
2300
x100
470E
Chessboard
*special problem
1900
x195
470D
Caesar Cipher
*special problem
1900
x150
470C
Eval
*special problem
1900
x237
470B
Hexakosioihexekontahexaphobia
*special problem
1800
x255
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x668
469B
Chat Online
implementation
1300
x12407
469A
I Wanna Be the Guy
greedy
,
implementation
800
x93154
468E
Permanent
dp
,
graph matchings
,
math
,
meet-in-the-middle
3100
x311
468D
Tree
graph matchings
3100
x358
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