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Codeforces Round 937 (Div. 4)
01:53:05
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Difficulty:
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bitmasks
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
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Name
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2656
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2668
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2671
1238E
Keyboard Purchase
bitmasks
,
dp
2200
x2696
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2698
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2734
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2768
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2784
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2812
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2819
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2821
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2874
1215E
Marbles
bitmasks
,
dp
2200
x2894
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x2939
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x2951
1030E
Vasya and Good Sequences
bitmasks
,
dp
2000
x2952
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2957
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3039
1331C
...And after happily lived ever they
*special problem
,
bitmasks
x3118
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3143
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3143
8C
Looking for Order
bitmasks
,
dp
2000
x3161
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3181
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3211
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3256
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3273
1017D
The Wu
bitmasks
,
brute force
,
data structures
1900
x3308
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3317
1316E
Team Building
bitmasks
,
dp
,
greedy
,
sortings
2300
x3351
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3362
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3364
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3388
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3476
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3524
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x3585
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3613
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x3634
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3648
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3732
243A
The Brand New Function
bitmasks
1600
x3760
960C
Subsequence Counting
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1700
x3801
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x3811
1322B
Present
binary search
,
bitmasks
,
constructive algorithms
,
data structures
,
math
,
sortings
2100
x3867
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3882
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3931
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x3935
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x3971
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x3991
1438D
Powerful Ksenia
bitmasks
,
constructive algorithms
,
math
2200
x4030
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4131
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4155
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4165
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4185
1360H
Binary Median
binary search
,
bitmasks
,
brute force
,
constructive algorithms
2100
x4267
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4330
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4361
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4414
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4490
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4502
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x4524
1006F
Xor-Paths
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2100
x4555
1174D
Ehab and the Expected XOR Problem
bitmasks
,
constructive algorithms
1900
x4575
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4583
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4723
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4751
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x4852
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x4870
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4892
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5017
812B
Sagheer, the Hausmeister
bitmasks
,
brute force
,
dp
1600
x5054
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5064
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5093
1415D
XOR-gun
bitmasks
,
brute force
,
constructive algorithms
2000
x5116
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5125
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5140
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5156
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5160
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5200
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5232
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5390
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5442
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5470
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5493
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x5561
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5654
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5778
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5857
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x5905
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5938
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6083
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6110
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6114
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6185
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6248
1205B
Shortest Cycle
bitmasks
,
brute force
,
graphs
,
shortest paths
1900
x6258
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6290
1329B
Dreamoon Likes Sequences
bitmasks
,
combinatorics
,
math
1700
x6340
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6354
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6385
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x6475
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