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Before contest
Codeforces Round 950 (Div. 3)
31:27:08
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Difficulty:
—
divide and conquer
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
#
Name
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x376
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4586
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4426
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x723
809C
Find a car
combinatorics
,
divide and conquer
,
dp
2600
x733
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x363
793F
Julia the snail
data structures
,
divide and conquer
,
dp
3000
x515
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x358
786C
Till I Collapse
data structures
,
divide and conquer
2400
x2532
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x416
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x185
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x123
768B
Code For 1
constructive algorithms
,
dfs and similar
,
divide and conquer
1600
x5854
763E
Timofey and our friends animals
data structures
,
divide and conquer
,
dsu
2900
x476
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x483
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x869
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1469
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1710
715C
Digit Tree
dfs and similar
,
divide and conquer
,
dsu
,
trees
2700
x1963
685E
Travelling Through the Snow Queen's Kingdom
bitmasks
,
brute force
,
divide and conquer
,
graphs
2800
x504
678F
Lena and Queries
data structures
,
divide and conquer
,
geometry
2500
x827
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2910
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1964
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1535
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1030
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x2598
627C
Package Delivery
data structures
,
divide and conquer
,
greedy
2200
x1152
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2702
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1172
576C
Points on Plane
constructive algorithms
,
divide and conquer
,
geometry
,
greedy
,
sortings
2100
x3243
573D
Bear and Cavalry
data structures
,
divide and conquer
,
dp
3000
x452
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x697
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10410
549F
Yura and Developers
data structures
,
divide and conquer
2800
x851
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x374
526F
Pudding Monsters
data structures
,
divide and conquer
3000
x2340
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2565
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x504
500F
New Year Shopping
divide and conquer
,
dp
2700
x700
480E
Parking Lot
data structures
,
divide and conquer
2800
x515
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x9594
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1379
448C
Painting Fence
divide and conquer
,
dp
,
greedy
1900
x7850
440C
One-Based Arithmetic
brute force
,
dfs and similar
,
divide and conquer
1800
x894
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1803
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x254
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2609
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2181
413E
Maze 2D
data structures
,
divide and conquer
2200
x672
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x2788
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2132
372B
Counting Rectangles is Fun
brute force
,
divide and conquer
,
dp
1900
x2527
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x536
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x691
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7707
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5853
321E
Ciel and Gondolas
data structures
,
divide and conquer
,
dp
2600
x4674
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6852
293E
Close Vertices
data structures
,
divide and conquer
,
trees
2700
x1274
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1457
232E
Quick Tortoise
bitmasks
,
divide and conquer
,
dp
3000
x678
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x282
217C
Formurosa
divide and conquer
,
dp
,
expression parsing
2600
x313
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x741
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x191
161C
Abracadabra
divide and conquer
2400
x640
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x792
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x910
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x313
117D
Not Quick Transformation
divide and conquer
,
math
2500
x331
101E
Candies and Stones
divide and conquer
,
dp
2500
x478
97B
Superset
constructive algorithms
,
divide and conquer
2300
x806
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x451
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1638
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x3684
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