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Codeforces Round 950 (Div. 3)
38:43:22
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Difficulty:
—
dp
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
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1193
1542D
Priority Queue
combinatorics
,
dp
,
implementation
,
math
,
ternary search
2200
x2540
1540C2
Converging Array (Hard Version)
dp
,
math
2900
x440
1540C1
Converging Array (Easy Version)
dp
,
math
2700
x601
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2504
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x927
1539B
Love Song
dp
,
implementation
,
strings
800
x23865
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x18496
1538A
Stone Game
brute force
,
dp
,
greedy
800
x35938
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12358
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13648
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2650
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7521
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16157
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x144
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x530
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x519
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12555
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x81
1531C
Симметричный амфитеатр
*special problem
,
constructive algorithms
,
dp
x647
1530H
Turing's Award
data structures
,
dp
3400
x145
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x754
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x513
1528B
Kavi on Pairing Duty
combinatorics
,
dp
,
math
1700
x8506
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x14008
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x2100
1526C1
Potions (Easy Version)
brute force
,
data structures
,
dp
,
greedy
1500
x21398
1526B
I Hate 1111
dp
,
math
,
number theory
1400
x29029
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x319
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1974
1525D
Armchairs
dp
,
flows
,
graph matchings
,
greedy
1800
x9430
1523H
Hopping Around the Array
data structures
,
dp
3500
x235
1523F
Favorite Game
bitmasks
,
dp
3300
x405
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1541
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x2088
1521E
Nastia and a Beautiful Matrix
binary search
,
constructive algorithms
,
dp
,
greedy
2700
x653
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1814
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x391
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14655
1519B
The Cake Is a Lie
dp
,
math
800
x30130
1517H
Fly Around the World
dp
,
geometry
3500
x65
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x449
1517D
Explorer Space
dp
,
graphs
,
shortest paths
1800
x7380
1516E
Baby Ehab Plays with Permutations
combinatorics
,
dp
,
math
2500
x816
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4118
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11578
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x18256
1515E
Phoenix and Computers
combinatorics
,
dp
,
math
2200
x3392
1513C
Add One
dp
,
matrices
1600
x13332
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x7862
1512F
Education
brute force
,
dp
,
greedy
,
implementation
1900
x5978
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x704
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x419
1511E
Colorings and Dominoes
combinatorics
,
dp
,
greedy
,
math
2100
x2471
1510H
Hard Optimization
dp
3200
x98
1510D
Digits
dp
,
math
,
number theory
2100
x1805
1509C
The Sports Festival
dp
,
greedy
1800
x11913
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4115
1503E
2-Coloring
combinatorics
,
dp
,
math
3100
x597
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3212
1501B
Napoleon Cake
dp
,
implementation
,
sortings
900
x18549
1500F
Cupboards Jumps
dp
3500
x331
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1254
1499E
Chaotic Merge
combinatorics
,
dp
,
math
,
strings
2400
x1414
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5519
1499B
Binary Removals
brute force
,
dp
,
greedy
,
implementation
1000
x20335
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x857
1498D
Bananas in a Microwave
dfs and similar
,
dp
,
graphs
,
implementation
2200
x2253
1498C
Planar Reflections
brute force
,
data structures
,
dp
1600
x9275
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1571
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x8067
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x1491
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x282
1494C
1D Sokoban
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1900
x5249
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15649
1491D
Zookeeper and The Infinite Zoo
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
1800
x6934
1491C
Pekora and Trampoline
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x7739
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x207
1487G
String Counting
combinatorics
,
dp
,
fft
,
math
2700
x579
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x361
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x628
1486E
Paired Payment
binary search
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graphs
,
shortest paths
2200
x2809
1486D
Max Median
binary search
,
data structures
,
dp
2100
x6805
1485F
Copy or Prefix Sum
combinatorics
,
data structures
,
dp
,
sortings
2400
x1873
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1219
1485B
Replace and Keep Sorted
dp
,
implementation
,
math
1200
x16722
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x2972
1481F
AB Tree
dp
,
greedy
,
trees
3100
x477
1481E
Sorting Books
data structures
,
dp
,
greedy
2500
x2003
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x194
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
1476F
Lanterns
binary search
,
data structures
,
dp
3000
x634
1476D
Journey
dfs and similar
,
dp
,
dsu
,
implementation
1700
x8417
1476C
Longest Simple Cycle
dp
,
graphs
,
greedy
1600
x11097
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6465
1475D
Cleaning the Phone
binary search
,
dp
,
sortings
,
two pointers
1800
x9787
1475B
New Year's Number
brute force
,
dp
,
math
900
x46803
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x243
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