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Before contest
Codeforces Round 941 (Div. 1)
3 days
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Before contest
Codeforces Round 941 (Div. 2)
3 days
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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
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implementation
interactive
math
matrices
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probabilities
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shortest paths
sortings
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ternary search
trees
two pointers
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Problems
#
Name
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x855
611E
New Year and Three Musketeers
data structures
,
greedy
,
sortings
2400
x853
875E
Delivery Club
binary search
,
data structures
,
dp
2600
x849
687D
Dividing Kingdom II
brute force
,
data structures
,
dsu
,
graphs
,
sortings
2500
x849
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x848
549F
Yura and Developers
data structures
,
divide and conquer
2800
x847
45C
Dancing Lessons
data structures
1900
x847
387E
George and Cards
binary search
,
data structures
2200
x845
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x844
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x843
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x842
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x842
1684F
Diverse Segments
data structures
,
two pointers
2600
x841
1111E
Tree
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2500
x840
1575I
Illusions of the Desert
data structures
,
trees
2300
x836
1083C
Max Mex
data structures
,
trees
2900
x836
487D
Conveyor Belts
data structures
2700
x836
1539F
Strange Array
data structures
,
greedy
,
sortings
2600
x835
811E
Vladik and Entertaining Flags
data structures
,
dsu
,
graphs
2600
x834
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x832
398D
Instant Messanger
data structures
x828
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x827
628E
Zbazi in Zeydabad
data structures
,
implementation
2300
x827
1469F
Power Sockets
binary search
,
data structures
,
greedy
2600
x824
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x822
678F
Lena and Queries
data structures
,
divide and conquer
,
geometry
2500
x822
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x821
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x817
1163F
Indecisive Taxi Fee
data structures
,
graphs
,
shortest paths
3000
x817
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x815
1893D
Colorful Constructive
constructive algorithms
,
data structures
,
greedy
2600
x810
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x808
1614E
Divan and a Cottage
binary search
,
data structures
2600
x807
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x805
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x800
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x799
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x798
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x796
601E
A Museum Robbery
data structures
,
dp
2800
x796
1017G
The Tree
data structures
3200
x789
1030F
Putting Boxes Together
data structures
2500
x788
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x785
605D
Board Game
data structures
,
dfs and similar
2500
x785
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x785
610E
Alphabet Permutations
data structures
,
strings
2500
x782
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x778
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x778
1348F
Phoenix and Memory
data structures
,
dfs and similar
,
graphs
,
greedy
2600
x771
1039A
Timetable
constructive algorithms
,
data structures
,
greedy
,
math
2300
x771
1693D
Decinc Dividing
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
2800
x770
420D
Cup Trick
data structures
2200
x763
467E
Alex and Complicated Task
data structures
,
dp
,
greedy
2300
x761
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x759
1373G
Pawns
data structures
,
divide and conquer
,
greedy
2600
x758
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x757
575A
Fibonotci
data structures
,
math
,
matrices
2700
x756
809D
Hitchhiking in the Baltic States
data structures
,
dp
2900
x754
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x753
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x748
1383E
Strange Operation
combinatorics
,
data structures
,
dp
2800
x746
1312G
Autocompletion
data structures
,
dfs and similar
,
dp
2600
x745
1179D
Fedor Runs for President
data structures
,
dp
,
trees
2700
x745
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x734
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x732
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x728
794F
Leha and security system
data structures
2800
x728
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x723
746F
Music in Car
data structures
,
greedy
,
two pointers
2200
x722
266E
More Queries to Array...
data structures
,
math
2500
x718
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x714
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x714
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x710
15D
Map
data structures
,
implementation
,
sortings
2500
x707
182C
Optimal Sum
data structures
,
greedy
2000
x705
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x703
1098D
Eels
data structures
2800
x701
35E
Parade
data structures
,
sortings
2100
x700
1413F
Roads and Ramen
data structures
,
trees
2800
x699
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x699
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x697
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x697
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x697
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x695
1195F
Geometers Anonymous Club
data structures
,
geometry
,
math
,
sortings
2500
x693
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x693
1004F
Sonya and Bitwise OR
bitmasks
,
data structures
,
divide and conquer
2600
x691
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x686
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x685
407E
k-d-sequence
data structures
3100
x684
587E
Duff as a Queen
data structures
2900
x683
66E
Petya and Post
data structures
,
dp
2000
x680
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x673
38G
Queue
data structures
2300
x673
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x672
331B2
Shave Beaver!
data structures
1900
x671
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x669
413E
Maze 2D
data structures
,
divide and conquer
2200
x663
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x660
311D
Interval Cubing
data structures
,
math
2600
x659
679E
Bear and Bad Powers of 42
data structures
3100
x658
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