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Before contest
Codeforces Round 988 (Div. 3)
44:48:05
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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
#
Name
542F
Quest
dp
,
greedy
2100
x927
542E
Playing on Graph
graphs
,
shortest paths
2600
x865
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x514
542C
Idempotent functions
constructive algorithms
,
graphs
,
math
2000
x1135
542B
Duck Hunt
data structures
3100
x205
542A
Place Your Ad Here
data structures
,
sortings
2400
x575
540E
Infinite Inversions
binary search
,
data structures
,
implementation
,
sortings
,
trees
2100
x2133
540D
Bad Luck Island
dp
,
probabilities
1900
x5528
540C
Ice Cave
dfs and similar
2000
x7347
540B
School Marks
greedy
,
implementation
1700
x4710
538H
Summer Dichotomy
2-sat
,
data structures
,
dfs and similar
,
greedy
3200
x662
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x470
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1737
538E
Demiurges Play Again
dfs and similar
,
dp
,
math
,
trees
2200
x1547
538D
Weird Chess
brute force
,
constructive algorithms
,
implementation
1800
x2430
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5827
538B
Quasi Binary
constructive algorithms
,
dp
,
greedy
,
implementation
1400
x18135
538A
Cutting Banner
brute force
,
implementation
1400
x7144
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x397
536D
Tavas in Kansas
dp
,
games
2900
x734
535E
Tavas and Pashmaks
geometry
,
math
2600
x806
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3959
535C
Tavas and Karafs
binary search
,
greedy
,
math
1900
x3799
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x473
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x351
534D
Handshakes
binary search
,
constructive algorithms
,
data structures
,
greedy
1900
x2419
534C
Polycarpus' Dice
math
1600
x5032
534B
Covered Path
dp
,
greedy
,
math
1400
x10327
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x906
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2267
533D
Landmarks
data structures
,
dp
3000
x235
533C
Board Game
games
,
greedy
,
implementation
,
math
1700
x2199
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2406
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x392
530I
Different variables
*special problem
2500
x47
530H
Points in triangle
*special problem
,
geometry
2100
x123
530G
Levenshtein distance
*special problem
2100
x158
530F
Jumping frogs
*special problem
2100
x101
530E
Sum and product
*special problem
1700
x308
530D
Set subtraction
*special problem
1600
x452
530C
Diophantine equation
*special problem
1500
x556
530B
String inside out
*special problem
1600
x542
530A
Quadratic equation
*special problem
1500
x675
529B
Group Photo 2 (online mirror version)
brute force
,
greedy
,
sortings
1900
x876
528E
Triangles 3000
geometry
,
sortings
3100
x218
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2245
527E
Data Center Drama
dfs and similar
,
graphs
2600
x2004
527D
Clique Problem
data structures
,
dp
,
greedy
,
implementation
,
sortings
1800
x4803
527C
Glass Carving
binary search
,
data structures
,
implementation
1500
x6933
527B
Error Correct System
greedy
1500
x3886
526G
Spiders Evil Plan
greedy
,
trees
3300
x748
526F
Pudding Monsters
data structures
,
divide and conquer
3000
x2578
526E
Transmitting Levels
dp
,
implementation
2400
x1085
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2178
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2524
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4505
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x3306
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1789
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5827
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9438
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x535
524E
Rooks and Rectangles
data structures
,
sortings
2400
x1209
524D
Social Network
greedy
,
two pointers
2100
x956
524C
The Art of Dealing with ATM
binary search
,
sortings
1900
x2057
524B
Фото на память - 2 (round version)
dp
,
greedy
1700
x1464
524A
Возможно, вы знаете этих людей?
implementation
1600
x1413
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2348
523C
Name Quest
*special problem
,
greedy
1400
x2501
523B
Mean Requests
*special problem
,
implementation
1500
x952
522D
Closest Equals
*special problem
,
data structures
2000
x3239
522C
Chicken or Fish?
greedy
2100
x722
521E
Cycling City
dfs and similar
,
graphs
3100
x1059
521D
Shop
greedy
2800
x1613
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1879
520D
Cubes
games
,
greedy
,
implementation
2100
x1563
520C
DNA Alignment
math
,
strings
1500
x4171
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x51463
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6914
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6397
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x374
518E
Arthur and Questions
greedy
,
implementation
,
math
,
ternary search
2200
x1002
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x7050
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x6031
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x7997
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9230
516E
Drazil and His Happy Friends
math
,
number theory
3100
x505
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1319
515E
Drazil and Park
data structures
2300
x2144
515D
Drazil and Tiles
constructive algorithms
,
greedy
2000
x2867
515C
Drazil and Factorial
greedy
,
math
,
sortings
1400
x26111
514E
Darth Vader and Tree
dp
,
matrices
2200
x1445
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4481
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6952
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20912
513G3
Inversions problem
dp
3100
x265
513G2
Inversions problem
dp
,
probabilities
2400
x662
513G1
Inversions problem
brute force
,
dfs and similar
,
dp
,
meet-in-the-middle
1800
x1793
513F2
Scaygerboss
flows
2800
x358
513F1
Scaygerboss
flows
2700
x324
513E2
Subarray Cuts
dp
2700
x592
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