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Before contest
Codeforces Round 941 (Div. 1)
11:35:00
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
11:35:00
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greedy
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
1472A
Cards for Friends
greedy
,
math
800
x40764
1471B
Strange List
brute force
,
greedy
,
implementation
,
math
1100
x19095
1471A
Strange Partition
greedy
,
math
,
number theory
900
x24413
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3574
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21181
1469F
Power Sockets
binary search
,
data structures
,
greedy
2600
x824
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10478
1469B
Red and Blue
dp
,
greedy
1000
x25979
1469A
Regular Bracket Sequence
constructive algorithms
,
greedy
1000
x26459
1468N
Waste Sorting
greedy
,
implementation
900
x7876
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x312
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x3881
1468H
K and Medians
constructive algorithms
,
greedy
,
math
2200
x1702
1468E
Four Segments
greedy
800
x8610
1468A
LaIS
data structures
,
dp
,
greedy
2200
x1563
1467C
Three Bags
constructive algorithms
,
greedy
1900
x6199
1467A
Wizard of Orz
constructive algorithms
,
greedy
,
math
900
x23835
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x259
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2789
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x10764
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17287
1466B
Last minute enhancements
dp
,
greedy
800
x22352
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4231
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x18697
1462F
The Treasure of The Segments
binary search
,
data structures
,
greedy
1800
x6658
1462D
Add to Neighbour and Remove
greedy
,
math
,
number theory
1400
x16194
1462C
Unique Number
brute force
,
greedy
,
math
900
x31146
1461F
Mathematical Expression
constructive algorithms
,
dp
,
greedy
2700
x528
1461E
Water Level
brute force
,
graphs
,
greedy
,
implementation
,
math
2200
x2059
1461A
String Generation
constructive algorithms
,
greedy
800
x18385
1458D
Flip and Reverse
data structures
,
graphs
,
greedy
3100
x967
1456E
XOR-ranges
dp
,
greedy
3500
x268
1455F
String and Operations
dp
,
greedy
2800
x417
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1425
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x11967
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3792
1454C
Sequence Transformation
greedy
,
implementation
1200
x20943
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1964
1453D
Checkpoints
brute force
,
constructive algorithms
,
greedy
,
math
,
probabilities
1900
x4072
1453C
Triangles
greedy
,
implementation
1700
x5973
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x451
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x297
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1482
1452C
Two Brackets
greedy
800
x18976
1452B
Toy Blocks
binary search
,
greedy
,
math
,
sortings
1400
x14417
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15190
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x18981
1451A
Subtract or Divide
greedy
,
math
800
x23900
1450F
The Struggling Contestant
constructive algorithms
,
greedy
2400
x1267
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5301
1450B
Balls of Steel
brute force
,
geometry
,
greedy
1000
x14861
1447B
Numbers Box
greedy
,
math
1000
x15120
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1213
1446D1
Frequency Problem (Easy Version)
data structures
,
greedy
2600
x1603
1446A
Knapsack
constructive algorithms
,
greedy
,
sortings
1300
x14876
1445B
Elimination
greedy
,
math
900
x15023
1445A
Array Rearrangment
greedy
,
sortings
800
x18797
1443C
The Delivery Dilemma
binary search
,
greedy
,
sortings
1400
x14928
1443B
Saving the City
dp
,
greedy
,
math
,
sortings
1300
x15461
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x551
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x1919
1442C
Graph Transpositions
dfs and similar
,
graphs
,
greedy
,
shortest paths
2400
x1577
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4297
1442A
Extreme Subtraction
constructive algorithms
,
dp
,
greedy
1800
x8551
1440B
Sum of Medians
greedy
,
math
900
x17279
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1674
1439A2
Binary Table (Hard Version)
constructive algorithms
,
graphs
,
greedy
,
implementation
1900
x4943
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x18363
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12283
1437C
Chef Monocarp
dp
,
flows
,
graph matchings
,
greedy
,
math
,
sortings
1800
x10090
1437B
Reverse Binary Strings
constructive algorithms
,
greedy
1200
x18649
1437A
Marketing Scheme
brute force
,
constructive algorithms
,
greedy
,
math
800
x17815
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5831
1433C
Dominant Piranha
constructive algorithms
,
greedy
900
x26335
1433B
Yet Another Bookshelf
greedy
,
implementation
800
x27952
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x64
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x137
1431F
Neural Network Problem
*special problem
,
binary search
,
greedy
2100
x152
1431D
Used Markers
*special problem
,
greedy
1500
x446
1430F
Realistic Gameplay
dp
,
greedy
2600
x855
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6146
1430D
String Deletion
binary search
,
data structures
,
greedy
,
two pointers
1700
x8658
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x23274
1430B
Barrels
greedy
,
implementation
,
sortings
800
x19102
1428G2
Lucky Numbers (Hard Version)
dp
,
greedy
3000
x603
1428G1
Lucky Numbers (Easy Version)
dp
,
greedy
2900
x545
1428E
Carrots for Rabbits
binary search
,
data structures
,
greedy
,
math
,
sortings
2200
x3497
1428D
Bouncing Boomerangs
constructive algorithms
,
greedy
,
implementation
1900
x4397
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19612
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x302
1427B
Chess Cheater
greedy
,
implementation
,
sortings
1400
x10683
1426E
Rock, Paper, Scissors
brute force
,
constructive algorithms
,
flows
,
greedy
,
math
1800
x7212
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x15459
1425E
Excitation of Atoms
greedy
,
implementation
2200
x905
1425A
Arena of Greed
games
,
greedy
1400
x6344
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x728
1422B
Nice Matrix
greedy
,
implementation
,
math
1300
x14169
1421D
Hexagons
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
1900
x4046
1421A
XORwice
bitmasks
,
greedy
,
math
800
x27120
1420E
Battle Lemmings
dp
,
greedy
2500
x839
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