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Before contest
Codeforces Round 941 (Div. 1)
24:09:20
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Before contest
Codeforces Round 941 (Div. 2)
24:09:19
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→ Filter Problems
Difficulty:
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implementation
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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Problems
#
Name
1681C
Double Sort
implementation
,
sortings
1200
x16933
1681B
Card Trick
implementation
,
math
800
x19803
1680B
Robots
implementation
800
x18052
1679C
Rooks Defenders
data structures
,
implementation
1400
x9850
1679B
Stone Age Problem
data structures
,
implementation
1200
x16882
1678B2
Tokitsukaze and Good 01-String (hard version)
dp
,
greedy
,
implementation
1800
x6379
1678B1
Tokitsukaze and Good 01-String (easy version)
implementation
800
x15667
1678A
Tokitsukaze and All Zero Sequence
implementation
800
x17904
1677B
Tokitsukaze and Meeting
data structures
,
implementation
,
math
1700
x4009
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15742
1676D
X-Sum
brute force
,
greedy
,
implementation
1000
x23900
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x28680
1676A
Lucky?
implementation
800
x57622
1675D
Vertical Paths
graphs
,
implementation
,
trees
1300
x12519
1675C
Detective Task
implementation
1100
x17694
1675B
Make It Increasing
greedy
,
implementation
900
x24552
1674F
Desktop Rearrangement
data structures
,
greedy
,
implementation
1800
x4854
1674D
A-B-C Sort
constructive algorithms
,
implementation
,
sortings
1200
x15739
1674C
Infinite Replacement
combinatorics
,
implementation
,
strings
1000
x22850
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x5972
1672C
Unequal Array
constructive algorithms
,
greedy
,
implementation
1100
x12903
1672B
I love AAAB
constructive algorithms
,
implementation
800
x15550
1672A
Log Chopping
games
,
implementation
,
math
800
x15828
1671A
String Building
implementation
800
x20132
1670D
Very Suspicious
binary search
,
brute force
,
geometry
,
greedy
,
implementation
,
math
1700
x4943
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9479
1670B
Dorms War
brute force
,
implementation
,
strings
1100
x12401
1670A
Prof. Slim
greedy
,
implementation
,
sortings
800
x15225
1669G
Fall Down
dfs and similar
,
implementation
1200
x17260
1669D
Colorful Stamp
implementation
1100
x20986
1669C
Odd/Even Increments
greedy
,
greedy
,
implementation
,
math
800
x32726
1669B
Triple
implementation
,
sortings
800
x39635
1669A
Division?
implementation
800
x56677
1668A
Direction Change
implementation
,
math
800
x16142
1667F
Yin Yang
implementation
3500
x91
1666F
Fancy Stack
combinatorics
,
dp
,
implementation
2200
x1103
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1421
1663E
Are You Safe?
*special problem
,
implementation
x538
1663C
Pōja Verdon
*special problem
,
implementation
,
math
x5609
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3346
1662O
Circular Maze
brute force
,
dfs and similar
,
graphs
,
implementation
x1260
1662I
Ice Cream Shop
brute force
,
implementation
,
sortings
x1950
1662F
Antennas
data structures
,
dfs and similar
,
graphs
,
graphs
,
implementation
,
implementation
,
shortest paths
,
shortest paths
x959
1662D
Evolution of Weasels
greedy
,
implementation
,
strings
x1674
1662A
Organizing SWERC
brute force
,
implementation
x4143
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2585
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x6962
1660E
Matrix and Shifts
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x6945
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8095
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3859
1659C
Line Empire
binary search
,
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9614
1659A
Red Versus Blue
constructive algorithms
,
greedy
,
implementation
,
math
1000
x16872
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1001
1658A
Marin and Photoshoot
constructive algorithms
,
implementation
,
math
800
x20123
1657C
Bracket Sequence Deletion
greedy
,
implementation
1200
x16485
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13138
1654A
Maximum Cake Tastiness
brute force
,
greedy
,
implementation
,
sortings
800
x18400
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x10440
1651A
Playoff
implementation
800
x25310
1650F
Vitaly and Advanced Useless Algorithms
dp
,
greedy
,
implementation
2200
x1373
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4003
1650D
Twist the Permutation
brute force
,
constructive algorithms
,
implementation
,
math
1300
x12646
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16339
1650A
Deletions of Two Adjacent Letters
implementation
,
strings
800
x33805
1649B
Game of Ball Passing
greedy
,
implementation
1300
x12757
1649A
Game
implementation
800
x15379
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x383
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x785
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2857
1647B
Madoka and the Elegant Gift
brute force
,
constructive algorithms
,
graphs
,
implementation
1200
x15043
1647A
Madoka and Math Dad
implementation
,
math
800
x22439
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x389
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3526
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x2957
1644D
Cross Coloring
data structures
,
implementation
,
math
1700
x6977
1644C
Increase Subarray Sums
brute force
,
dp
,
greedy
,
implementation
1400
x13317
1644B
Anti-Fibonacci Permutation
brute force
,
constructive algorithms
,
implementation
800
x20433
1644A
Doors and Keys
implementation
800
x26814
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3721
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1787
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4029
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3177
1637C
Andrew and Stones
greedy
,
implementation
1200
x17301
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1524
1632A
ABC
implementation
800
x28866
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3072
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15172
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x552
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2219
1627A
Not Shading
constructive algorithms
,
implementation
800
x23775
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10593
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1963
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3925
1624B
Make AP
implementation
,
math
900
x34085
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1347
1623B
Game on Ranges
brute force
,
dfs and similar
,
implementation
,
sortings
1100
x13889
1623A
Robot Cleaner
brute force
,
implementation
,
math
800
x19876
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x532
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1710
1621B
Integers Shop
data structures
,
greedy
,
implementation
1500
x13068
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