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Codeforces Round 961 (Div. 2)
07:00:41
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Difficulty:
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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
456A
Laptops
sortings
1100
x46812
455E
Function
data structures
2900
x667
455D
Serega and Fun
data structures
2700
x2863
455C
Civilization
dfs and similar
,
dp
,
dsu
,
ternary search
,
trees
2100
x5610
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x5791
455A
Boredom
dp
1500
x56152
454B
Little Pony and Sort by Shift
implementation
1200
x18009
454A
Little Pony and Crystal Mine
implementation
800
x14644
453E
Little Pony and Lord Tirek
data structures
3100
x686
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x462
453C
Little Pony and Summer Sun Celebration
constructive algorithms
,
dfs and similar
,
graphs
2200
x1585
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4610
453A
Little Pony and Expected Maximum
probabilities
1600
x10206
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1420
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1050
452D
Washer, Dryer, Folder
greedy
,
implementation
1900
x1481
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1607
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1988
452A
Eevee
brute force
,
implementation
,
strings
1000
x7937
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3486
451D
Count Good Substrings
math
2000
x4677
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3314
451B
Sort the Array
implementation
,
sortings
1300
x44263
451A
Game With Sticks
implementation
900
x64162
450B
Jzzhu and Sequences
implementation
,
math
1300
x25802
450A
Jzzhu and Children
implementation
1000
x33417
449E
Jzzhu and Squares
dp
,
math
,
number theory
2900
x285
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4249
449C
Jzzhu and Apples
constructive algorithms
,
number theory
2500
x2227
449B
Jzzhu and Cities
graphs
,
greedy
,
shortest paths
2000
x8287
449A
Jzzhu and Chocolate
greedy
,
math
1700
x3880
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1472
448D
Multiplication Table
binary search
,
brute force
1800
x13621
448C
Painting Fence
divide and conquer
,
dp
,
greedy
1900
x8001
448B
Suffix Structures
implementation
,
strings
1400
x15890
448A
Rewards
implementation
800
x24052
447B
DZY Loves Strings
greedy
,
implementation
1000
x20154
447A
DZY Loves Hash
implementation
800
x9514
446E
DZY Loves Bridges
math
,
matrices
3100
x122
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x387
446C
DZY Loves Fibonacci Numbers
data structures
,
math
,
number theory
2400
x3236
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3560
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12389
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12352
445A
DZY Loves Chessboard
dfs and similar
,
implementation
1200
x28947
444E
DZY Loves Planting
binary search
,
dsu
,
trees
2700
x749
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x759
444C
DZY Loves Colors
data structures
2400
x2852
444B
DZY Loves FFT
probabilities
2300
x1056
444A
DZY Loves Physics
greedy
,
math
1600
x3385
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4016
443A
Anton and Letters
constructive algorithms
,
implementation
800
x86697
442E
Gena and Second Distance
geometry
3100
x172
442D
Adam and Tree
data structures
,
trees
2600
x968
442C
Artem and Array
data structures
,
greedy
2500
x1712
442B
Andrey and Problem
greedy
,
math
,
probabilities
1800
x5193
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2100
441E
Valera and Number
bitmasks
,
dp
,
math
,
probabilities
2400
x683
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1073
441C
Valera and Tubes
constructive algorithms
,
dfs and similar
,
implementation
1500
x11079
441B
Valera and Fruits
greedy
,
implementation
1400
x6997
441A
Valera and Antique Items
implementation
1000
x18339
440D
Berland Federalization
dp
,
trees
2200
x649
440C
One-Based Arithmetic
brute force
,
dfs and similar
,
divide and conquer
1800
x899
440B
Balancer
greedy
,
implementation
1600
x1933
440A
Forgotten Episode
implementation
800
x7206
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1516
439D
Devu and his Brother
binary search
,
sortings
,
ternary search
,
two pointers
1700
x5934
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3819
439B
Devu, the Dumb Guy
implementation
,
sortings
1200
x14162
439A
Devu, the Singer and Churu, the Joker
greedy
,
implementation
900
x25098
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1841
438D
The Child and Sequence
data structures
,
math
2300
x8169
437E
The Child and Polygon
dp
,
geometry
2500
x698
437D
The Child and Zoo
dsu
,
sortings
1900
x3337
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x13652
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9323
437A
The Child and Homework
implementation
1300
x8943
436F
Banners
brute force
,
data structures
,
dp
3000
x373
436E
Cardboard Box
data structures
,
greedy
2600
x1295
436D
Pudding Monsters
dp
2800
x323
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2600
436B
Om Nom and Spiders
implementation
,
math
1400
x3046
436A
Feed with Candy
greedy
1500
x3435
435E
Special Graph
2500
x236
435D
Special Grid
brute force
,
dp
,
greedy
2000
x748
435C
Cardiogram
implementation
1600
x2553
435B
Pasha Maximizes
greedy
1400
x6831
435A
Queue on Bus Stop
implementation
1000
x10056
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x258
434D
Nanami's Power Plant
flows
2900
x406
433E
Tachibana Kanade's Tofu
dp
2500
x474
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1220
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2416
433B
Kuriyama Mirai's Stones
dp
,
implementation
,
sortings
1200
x37763
433A
Kitahara Haruki's Gift
brute force
,
implementation
1100
x16043
432E
Square Tiling
constructive algorithms
,
greedy
2300
x683
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8619
432C
Prime Swaps
greedy
,
sortings
1800
x2452
432B
Football Kit
brute force
,
greedy
,
implementation
1200
x11589
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