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Before contest
Codeforces Round 937 (Div. 4)
01:27:26
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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
#
Name
1316E
Team Building
bitmasks
,
dp
,
greedy
,
sortings
2300
x3351
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3316
1017D
The Wu
bitmasks
,
brute force
,
data structures
1900
x3308
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3273
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3256
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3211
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3181
8C
Looking for Order
bitmasks
,
dp
2000
x3159
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3143
981D
Bookshelves
bitmasks
,
dp
,
greedy
1900
x3143
1331C
...And after happily lived ever they
*special problem
,
bitmasks
x3118
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3031
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x2957
1030E
Vasya and Good Sequences
bitmasks
,
dp
2000
x2952
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x2950
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x2939
1215E
Marbles
bitmasks
,
dp
2200
x2894
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2874
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2820
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2819
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2812
1466F
Euclid's nightmare
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
2100
x2784
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2768
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2734
1209E1
Rotate Columns (easy version)
bitmasks
,
brute force
,
dp
,
greedy
,
sortings
2000
x2698
1238E
Keyboard Purchase
bitmasks
,
dp
2200
x2696
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2671
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2668
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2656
1166E
The LCMs Must be Large
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2632
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2625
768E
Game of Stones
bitmasks
,
dp
,
games
2100
x2607
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2559
707D
Persistent Bookcase
bitmasks
,
data structures
,
dfs and similar
,
implementation
2200
x2550
1185G1
Playlist for Polycarp (easy version)
bitmasks
,
combinatorics
,
dp
2100
x2530
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2438
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2427
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2408
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x2405
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2362
1073E
Segment Sum
bitmasks
,
combinatorics
,
dp
,
math
2300
x2357
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2347
1234F
Yet Another Substring Reverse
bitmasks
,
dp
2200
x2327
1168C
And Reachability
bitmasks
,
dp
2200
x2314
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2253
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2244
778B
Bitwise Formula
bitmasks
,
brute force
,
dfs and similar
,
expression parsing
,
implementation
1800
x2242
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2229
769D
k-Interesting Pairs Of Integers
*special problem
,
bitmasks
,
brute force
,
meet-in-the-middle
1700
x2195
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2171
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2160
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x2153
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2142
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2097
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2089
1523D
Love-Hate
bitmasks
,
brute force
,
dp
,
probabilities
2400
x2060
1208F
Bits And Pieces
bitmasks
,
dfs and similar
,
dp
,
greedy
2600
x2053
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2027
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x1976
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1959
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1955
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1946
993B
Open Communication
bitmasks
,
brute force
1900
x1927
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1915
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1911
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1907
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x1888
1102F
Elongated Matrix
binary search
,
bitmasks
,
brute force
,
dp
,
graphs
2000
x1857
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x1841
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1835
1209E2
Rotate Columns (hard version)
bitmasks
,
dp
,
greedy
,
sortings
2500
x1834
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x1822
1622E
Math Test
bitmasks
,
brute force
,
greedy
2200
x1820
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1809
1093G
Multidimensional Queries
bitmasks
,
data structures
2300
x1800
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1799
1185F
Two Pizzas
bitmasks
,
brute force
2100
x1791
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1786
1194E
Count The Rectangles
bitmasks
,
brute force
,
data structures
,
geometry
,
sortings
2200
x1717
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1708
1245F
Daniel and Spring Cleaning
bitmasks
,
brute force
,
combinatorics
,
dp
2300
x1707
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1704
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1671
916B
Jamie and Binary Sequence (changed after round)
bitmasks
,
greedy
,
math
2000
x1661
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1658
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1657
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1652
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1594
855E
Salazar Slytherin's Locket
bitmasks
,
dp
2200
x1586
1105E
Helping Hiasat
bitmasks
,
brute force
,
dp
,
meet-in-the-middle
2200
x1555
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1545
1411E
Poman Numbers
bitmasks
,
greedy
,
math
,
strings
2300
x1545
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1530
513C
Second price auction
bitmasks
,
probabilities
2000
x1515
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1501
379D
New Year Letter
bitmasks
,
brute force
,
dp
2000
x1476
993C
Careful Maneuvering
bitmasks
,
brute force
,
geometry
2100
x1475
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1471
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x1471
1242C
Sum Balance
bitmasks
,
dfs and similar
,
dp
,
graphs
2400
x1456
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