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Codeforces Round (Div. 1 + Div. 2)
43:23:21
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data structures
combine-tags-by-or
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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
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x940
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x433
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10132
1722C
Word Game
data structures
,
implementation
800
x29638
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x739
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1746
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20786
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12903
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x288
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1523
1718A2
Burenka and Traditions (hard version)
data structures
,
dp
,
greedy
1900
x5027
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1024
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x4023
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1615
1715C
Monoblock
combinatorics
,
data structures
,
implementation
,
math
1700
x8372
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7180
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x8759
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x29436
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1521
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x305
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1183
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4287
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2360
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2467
1709D
Rorororobot
binary search
,
data structures
,
greedy
,
math
1700
x8119
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x21932
1707E
Replace
binary search
,
data structures
3500
x562
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x5553
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2386
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1655
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1982
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x18364
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x24511
1703B
ICPC Balloons
data structures
,
implementation
800
x45747
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4351
1702F
Equate Multisets
constructive algorithms
,
data structures
,
greedy
,
math
,
number theory
1700
x7980
1702C
Train and Queries
data structures
,
greedy
1100
x21549
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x891
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5497
1700C
Helping the Nature
constructive algorithms
,
data structures
,
greedy
1700
x10497
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1088
1699D
Almost Triple Deletions
data structures
,
dp
,
greedy
2300
x3032
1698C
3SUM Closure
brute force
,
data structures
1300
x17976
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x13987
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x265
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5202
1695C
Zero Path
brute force
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x10416
1693E
Outermost Maximums
data structures
,
greedy
3400
x372
1693D
Decinc Dividing
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
2800
x774
1692H
Gambling
data structures
,
dp
,
greedy
,
math
1700
x7116
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x16093
1691E
Number of Groups
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2300
x1758
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5511
1690G
Count the Trains
binary search
,
data structures
,
greedy
,
sortings
2000
x3265
1690C
Restoring the Duration of Tasks
data structures
,
greedy
,
implementation
800
x25521
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4043
1689B
Mystic Permutation
data structures
,
greedy
900
x17133
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x557
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1342
1685E
The Ultimate LIS Problem
data structures
,
greedy
3500
x142
1684F
Diverse Segments
data structures
,
two pointers
2600
x842
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3049
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x288
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1552
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x699
1679C
Rooks Defenders
data structures
,
implementation
1400
x9924
1679B
Stone Age Problem
data structures
,
implementation
1200
x17090
1677E
Tokitsukaze and Beautiful Subsegments
data structures
2900
x505
1677B
Tokitsukaze and Meeting
data structures
,
implementation
,
math
1700
x4027
1677A
Tokitsukaze and Strange Inequality
brute force
,
data structures
,
dp
1600
x8139
1676H2
Maximum Crossings (Hard Version)
data structures
,
divide and conquer
,
sortings
1500
x10094
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15909
1674F
Desktop Rearrangement
data structures
,
greedy
,
implementation
1800
x4888
1672I
PermutationForces
data structures
,
greedy
3000
x137
1672H
Zigu Zagu
constructive algorithms
,
data structures
,
greedy
2700
x915
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9538
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x23363
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x16996
1667B
Optimal Partition
data structures
,
dp
2100
x3493
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1429
1662L
Il Derby della Madonnina
data structures
,
dp
,
math
x997
1662F
Antennas
data structures
,
dfs and similar
,
graphs
,
graphs
,
implementation
,
implementation
,
shortest paths
,
shortest paths
x969
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x913
1661D
Progressions Covering
data structures
,
greedy
1900
x4540
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2606
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3888
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1023
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x2448
1656H
Equal LCM Subsets
data structures
,
math
,
number theory
3200
x417
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17769
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x357
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1055
1654E
Arithmetic Operations
brute force
,
data structures
,
graphs
,
math
2300
x1998
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13178
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x363
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4844
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x10495
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2344
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4030
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