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Before contest
Codeforces Round 950 (Div. 3)
42:45:02
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Difficulty:
—
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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Custom test
Problems
#
Name
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x361
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4392
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x13753
1486A
Shifting Stacks
greedy
,
implementation
900
x24929
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1219
1485A
Add and Divide
brute force
,
greedy
,
math
,
number theory
1000
x21039
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9115
1481F
AB Tree
dp
,
greedy
,
trees
3100
x477
1481E
Sorting Books
data structures
,
dp
,
greedy
2500
x2003
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4408
1481C
Fence Painting
brute force
,
constructive algorithms
,
greedy
1600
x11346
1481B
New Colony
brute force
,
greedy
,
implementation
1100
x19061
1481A
Space Navigation
greedy
,
strings
800
x24689
1480B
The Great Hero
greedy
,
implementation
,
sortings
900
x16954
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x25472
1479B2
Painting the Array II
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2100
x3928
1479B1
Painting the Array I
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
1900
x6773
1478B
Nezzar and Lucky Number
brute force
,
dp
,
greedy
,
math
1100
x18066
1478A
Nezzar and Colorful Balls
brute force
,
greedy
800
x25748
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x118
1477C
Nezzar and Nice Beatmap
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
2200
x2214
1477B
Nezzar and Binary String
data structures
,
greedy
1900
x3085
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x11097
1476B
Inflation
binary search
,
brute force
,
greedy
,
math
1300
x19539
1476A
K-divisible Sum
binary search
,
constructive algorithms
,
greedy
,
math
1000
x35347
1474E
What Is It?
constructive algorithms
,
greedy
2500
x1299
1474D
Cleaning
data structures
,
dp
,
greedy
,
math
2200
x3883
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x12255
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x26745
1474A
Puzzle From the Future
greedy
800
x22225
1473A
Replacing Elements
greedy
,
implementation
,
math
,
sortings
800
x32943
1472F
New Year's Puzzle
brute force
,
dp
,
graph matchings
,
greedy
,
sortings
2100
x2950
1472D
Even-Odd Game
dp
,
games
,
greedy
,
sortings
1200
x26211
1472B
Fair Division
dp
,
greedy
,
math
800
x47896
1472A
Cards for Friends
greedy
,
math
800
x41040
1471B
Strange List
brute force
,
greedy
,
implementation
,
math
1100
x19148
1471A
Strange Partition
greedy
,
math
,
number theory
900
x24759
1470D
Strange Housing
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
2200
x3597
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21421
1469F
Power Sockets
binary search
,
data structures
,
greedy
2600
x828
1469C
Building a Fence
dp
,
greedy
,
implementation
,
two pointers
1600
x10523
1469B
Red and Blue
dp
,
greedy
1000
x26218
1469A
Regular Bracket Sequence
constructive algorithms
,
greedy
1000
x26613
1468N
Waste Sorting
greedy
,
implementation
900
x7913
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x314
1468J
Road Reform
dsu
,
graphs
,
greedy
1800
x3927
1468H
K and Medians
constructive algorithms
,
greedy
,
math
2200
x1711
1468E
Four Segments
greedy
800
x8630
1468A
LaIS
data structures
,
dp
,
greedy
2200
x1578
1467C
Three Bags
constructive algorithms
,
greedy
1900
x6228
1467A
Wizard of Orz
constructive algorithms
,
greedy
,
math
900
x23930
1466H
Finding satisfactory solutions
combinatorics
,
dp
,
graphs
,
greedy
,
math
3300
x265
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2802
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x10870
1466C
Canine poetry
dp
,
greedy
,
strings
1300
x17349
1466B
Last minute enhancements
dp
,
greedy
800
x22418
1463D
Pairs
binary search
,
constructive algorithms
,
greedy
,
two pointers
1900
x4258
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x18860
1462F
The Treasure of The Segments
binary search
,
data structures
,
greedy
1800
x6717
1462D
Add to Neighbour and Remove
greedy
,
math
,
number theory
1400
x16308
1462C
Unique Number
brute force
,
greedy
,
math
900
x31476
1461F
Mathematical Expression
constructive algorithms
,
dp
,
greedy
2700
x530
1461E
Water Level
brute force
,
graphs
,
greedy
,
implementation
,
math
2200
x2064
1461A
String Generation
constructive algorithms
,
greedy
800
x18419
1458D
Flip and Reverse
data structures
,
graphs
,
greedy
3100
x981
1456E
XOR-ranges
dp
,
greedy
3500
x271
1455F
String and Operations
dp
,
greedy
2800
x419
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1438
1455D
Sequence and Swaps
dp
,
greedy
,
sortings
1600
x12025
1454F
Array Partition
binary search
,
data structures
,
greedy
,
two pointers
2100
x3827
1454C
Sequence Transformation
greedy
,
implementation
1200
x21041
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1979
1453D
Checkpoints
brute force
,
constructive algorithms
,
greedy
,
math
,
probabilities
1900
x4092
1453C
Triangles
greedy
,
implementation
1700
x5988
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x460
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x299
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1489
1452C
Two Brackets
greedy
800
x19082
1452B
Toy Blocks
binary search
,
greedy
,
math
,
sortings
1400
x14470
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15249
1451B
Non-Substring Subsequence
dp
,
greedy
,
implementation
,
strings
900
x19032
1451A
Subtract or Divide
greedy
,
math
800
x23954
1450F
The Struggling Contestant
constructive algorithms
,
greedy
2400
x1275
1450D
Rating Compression
binary search
,
data structures
,
greedy
,
implementation
,
two pointers
1800
x5326
1450B
Balls of Steel
brute force
,
geometry
,
greedy
1000
x14919
1447B
Numbers Box
greedy
,
math
1000
x15414
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1227
1446D1
Frequency Problem (Easy Version)
data structures
,
greedy
2600
x1625
1446A
Knapsack
constructive algorithms
,
greedy
,
sortings
1300
x15029
1445B
Elimination
greedy
,
math
900
x15092
1445A
Array Rearrangment
greedy
,
sortings
800
x18856
1443C
The Delivery Dilemma
binary search
,
greedy
,
sortings
1400
x14999
1443B
Saving the City
dp
,
greedy
,
math
,
sortings
1300
x15538
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x560
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x1937
1442C
Graph Transpositions
dfs and similar
,
graphs
,
greedy
,
shortest paths
2400
x1583
1442B
Identify the Operations
combinatorics
,
data structures
,
dsu
,
greedy
,
implementation
1800
x4323
1442A
Extreme Subtraction
constructive algorithms
,
dp
,
greedy
1800
x8591
1440B
Sum of Medians
greedy
,
math
900
x17604
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1685
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