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Codeforces Round (Div. 2)
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data structures
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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
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number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
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Problems
#
Name
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4489
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2460
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2704
1709D
Rorororobot
binary search
,
data structures
,
greedy
,
math
1700
x8398
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x22687
1707E
Replace
binary search
,
data structures
3500
x621
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x5731
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2654
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1704
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x2069
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x19978
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x25601
1703B
ICPC Balloons
data structures
,
implementation
800
x48914
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4643
1702F
Equate Multisets
constructive algorithms
,
data structures
,
greedy
,
math
,
number theory
1700
x8370
1702C
Train and Queries
data structures
,
greedy
1100
x22227
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x924
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5677
1700C
Helping the Nature
constructive algorithms
,
data structures
,
greedy
1700
x10907
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1142
1699D
Almost Triple Deletions
data structures
,
dp
,
greedy
2300
x3142
1698C
3SUM Closure
brute force
,
data structures
1300
x18491
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x14349
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x276
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5451
1695C
Zero Path
brute force
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x10923
1693E
Outermost Maximums
data structures
,
greedy
3400
x422
1693D
Decinc Dividing
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
2800
x839
1692H
Gambling
data structures
,
dp
,
greedy
,
math
1700
x7458
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x17687
1691E
Number of Groups
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2300
x1829
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5789
1690G
Count the Trains
binary search
,
data structures
,
greedy
,
sortings
2000
x3385
1690C
Restoring the Duration of Tasks
data structures
,
greedy
,
implementation
800
x26100
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4210
1689B
Mystic Permutation
data structures
,
greedy
900
x17532
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x590
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1408
1685E
The Ultimate LIS Problem
data structures
,
greedy
3500
x150
1684F
Diverse Segments
data structures
,
two pointers
2600
x898
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3158
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x314
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1758
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x795
1679C
Rooks Defenders
data structures
,
implementation
1400
x10291
1679B
Stone Age Problem
data structures
,
implementation
1200
x18441
1677E
Tokitsukaze and Beautiful Subsegments
data structures
2900
x550
1677B
Tokitsukaze and Meeting
data structures
,
implementation
,
math
1700
x4174
1677A
Tokitsukaze and Strange Inequality
brute force
,
data structures
,
dp
1600
x8427
1676H2
Maximum Crossings (Hard Version)
data structures
,
divide and conquer
,
sortings
1500
x10730
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x16697
1674F
Desktop Rearrangement
data structures
,
greedy
,
implementation
1800
x5047
1672I
PermutationForces
data structures
,
greedy
3000
x172
1672H
Zigu Zagu
constructive algorithms
,
data structures
,
greedy
2700
x947
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9944
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x25755
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x17860
1667B
Optimal Partition
data structures
,
dp
2100
x3688
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1516
1662L
Il Derby della Madonnina
data structures
,
dp
,
math
x1065
1662F
Antennas
data structures
,
dfs and similar
,
graphs
,
graphs
,
implementation
,
implementation
,
shortest paths
,
shortest paths
x1032
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x949
1661D
Progressions Covering
data structures
,
greedy
1900
x4736
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2714
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x4008
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1046
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x2538
1656H
Equal LCM Subsets
data structures
,
math
,
number theory
3200
x571
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x18837
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x394
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1198
1654E
Arithmetic Operations
brute force
,
data structures
,
graphs
,
math
2300
x2090
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13477
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x380
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x5117
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x10702
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2482
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4143
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x131
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x399
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x881
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2984
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6437
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x12786
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x992
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x3096
1644D
Cross Coloring
data structures
,
implementation
,
math
1700
x7235
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2420
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x224
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1906
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4196
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14674
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20842
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x315
1635F
Closest Pair
data structures
,
greedy
2800
x1106
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1597
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1696
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x318
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1526
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1161
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