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Codeforces Round 940 (Div. 2)
4 days
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*has extra registration
→ Filter Problems
Difficulty:
—
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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Status
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Problems
#
Name
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x591
1767E
Algebra Flash
bitmasks
,
brute force
,
dp
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x823
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x657
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15162
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x6822
1748F
Circular Xor Reversal
bitmasks
,
constructive algorithms
3000
x321
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2644
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4454
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x241
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x9690
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1402
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x505
1739E
Cleaning Robot
bitmasks
,
dp
2400
x1158
1734F
Zeros and Ones
bitmasks
,
divide and conquer
,
dp
,
math
2500
x764
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2438
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5530
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8861
1730F
Almost Sorted
bitmasks
,
data structures
,
dp
2700
x408
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x387
1726B
Mainak and Interesting Sequence
bitmasks
,
constructive algorithms
,
math
1100
x14571
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x931
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x116
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x10218
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6246
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1717
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5694
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1013
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x4886
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x503
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1265
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x522
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2407
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x137
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x563
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1963
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x9903
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19113
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x299
1698A
XOR Mixup
bitmasks
,
brute force
800
x27685
1696A
NIT orz!
bitmasks
,
greedy
800
x18058
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1143
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x17820
1688A
Cirno's Perfect Bitmasks Classroom
bitmasks
,
brute force
800
x20552
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x17038
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x3609
1679F
Formalism for Formalism
bitmasks
,
dp
,
math
2600
x492
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1088
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x765
1673E
Power or XOR?
bitmasks
,
combinatorics
,
math
,
number theory
2500
x655
1670F
Jee, You See?
bitmasks
,
combinatorics
,
dp
2400
x912
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1660
1669H
Maximal AND
bitmasks
,
greedy
,
math
1300
x15961
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1416
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3669
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x16894
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1452
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x10577
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x2425
1658D1
388535 (Easy Version)
bitmasks
,
math
1600
x8724
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1045
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13046
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1034
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5968
1635A
Min Or Sum
bitmasks
,
greedy
800
x21952
1634B
Fortune Telling
bitmasks
,
math
1400
x15522
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12190
1632B
Roof Construction
bitmasks
,
constructive algorithms
1000
x20649
1630A
And Matching
bitmasks
,
constructive algorithms
1500
x14014
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1961
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x16910
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5494
1622E
Math Test
bitmasks
,
brute force
,
greedy
2200
x1828
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x850
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4008
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x768
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1810
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15112
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x9884
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1831
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2830
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x13052
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3762
1599J
Bob's Beautiful Array
bitmasks
,
brute force
,
greedy
2600
x282
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1318
1594B
Special Numbers
bitmasks
,
math
1100
x18735
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1540
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7572
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x831
1583F
Defender of Childhood Dreams
bitmasks
,
constructive algorithms
,
divide and conquer
2500
x1212
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5217
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x319
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x782
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11793
1567B
MEXor Mixup
bitmasks
,
greedy
1000
x21296
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x16958
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19028
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4182
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5884
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x28186
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8293
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