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Codeforces Round 950 (Div. 3)
29:39:51
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Difficulty:
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math
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
916A
Jamie and Alarm Snooze
brute force
,
implementation
,
math
900
x8490
915G
Coprime Arrays
math
,
number theory
2300
x1150
914G
Sum the Fibonacci
bitmasks
,
divide and conquer
,
dp
,
fft
,
math
2600
x899
914A
Perfect Squares
brute force
,
implementation
,
math
900
x13832
913H
Don't Exceed
math
,
probabilities
3400
x124
913G
Power Substring
math
,
number theory
3200
x196
913F
Strongly Connected Tournament
dp
,
graphs
,
math
,
probabilities
2800
x610
913A
Modular Exponentiation
implementation
,
math
900
x20648
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1494
911D
Inversion Counting
brute force
,
math
1800
x4465
910C
Minimum Sum
constructive algorithms
,
greedy
,
math
1700
x1746
909B
Segments
constructive algorithms
,
math
1300
x6215
908G
New Year and Original Order
dp
,
math
2800
x1288
908E
New Year and Entity Enumeration
bitmasks
,
combinatorics
,
dp
,
math
2500
x736
908D
New Year and Arbitrary Arrangement
dp
,
math
,
probabilities
2200
x2254
908C
New Year and Curling
brute force
,
geometry
,
implementation
,
math
1500
x6676
906D
Power Tower
chinese remainder theorem
,
math
,
number theory
2700
x1982
906B
Seating of Students
brute force
,
constructive algorithms
,
math
2200
x1125
903D
Almost Difference
data structures
,
math
2200
x3706
901E
Cyclic Cipher
fft
,
math
3300
x85
901B
GCD of Polynomials
constructive algorithms
,
math
2200
x1426
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x3015
900C
Remove Extra One
brute force
,
data structures
,
math
1700
x4482
900B
Position in Fraction
math
,
number theory
1300
x7651
899D
Shovel Sale
constructive algorithms
,
math
1800
x2703
899C
Dividing the numbers
constructive algorithms
,
graphs
,
math
1300
x8299
899A
Splitting in Teams
constructive algorithms
,
greedy
,
math
800
x10104
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1128
898A
Rounding
implementation
,
math
800
x15634
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x519
895D
String Mark
combinatorics
,
math
,
strings
2100
x1089
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5163
895B
XK Segments
binary search
,
math
,
sortings
,
two pointers
1700
x3430
894C
Marco and GCD Sequence
constructive algorithms
,
math
1900
x4296
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4389
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x3289
891E
Lust
combinatorics
,
math
,
matrices
3000
x867
891A
Pride
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x9682
889E
Mod Mod Mod
binary search
,
dp
,
math
3000
x518
888D
Almost Identity Permutations
combinatorics
,
dp
,
math
1600
x7742
886E
Maximum Element
combinatorics
,
dp
,
math
2400
x980
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x4626
883M
Quadcopter Competition
greedy
,
math
1100
x3502
883D
Packmen Strike Back
binary search
,
dp
,
math
2500
x350
876B
Divisiblity of Differences
implementation
,
math
,
number theory
1300
x8812
876A
Trip For Meal
math
900
x9255
875A
Classroom Watch
brute force
,
math
1200
x9502
870C
Maximum splitting
dp
,
greedy
,
math
,
number theory
1300
x8975
869C
The Intriguing Obsession
combinatorics
,
dp
,
math
1800
x4417
869B
The Eternal Immortality
math
1100
x12993
868G
El Toll Caves
math
3300
x120
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x134
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x68
864D
Make a Permutation!
greedy
,
implementation
,
math
1500
x5966
864C
Bus
greedy
,
implementation
,
math
1500
x5834
859G
Circle of Numbers
math
3000
x146
859B
Lazy Security Guard
brute force
,
geometry
,
math
1000
x6758
858A
k-rounding
brute force
,
math
,
number theory
1100
x7879
856C
Eleventh Birthday
combinatorics
,
dp
,
math
2400
x536
854B
Maxim Buys an Apartment
constructive algorithms
,
math
1200
x8137
854A
Fraction
brute force
,
constructive algorithms
,
math
800
x13425
852F
Product transformation
combinatorics
,
math
,
number theory
2200
x561
852A
Digits
brute force
,
implementation
,
math
2500
x380
851B
Arpa and an exam about geometry
geometry
,
math
1400
x5445
851A
Arpa and a research in Mexican wave
implementation
,
math
800
x9523
850F
Rainbow Balls
math
2800
x628
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x382
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x373
850A
Five Dimensional Points
brute force
,
geometry
,
math
1700
x2998
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x202
847M
Weather Tomorrow
implementation
,
math
1000
x6194
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1505
846F
Random Query
data structures
,
math
,
probabilities
,
two pointers
1800
x2210
845G
Shortest Path Problem?
dfs and similar
,
graphs
,
math
2300
x1509
844B
Rectangles
combinatorics
,
math
1300
x7075
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x347
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5564
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3423
841B
Godsend
games
,
math
1100
x12033
840A
Leha and Function
combinatorics
,
greedy
,
math
,
number theory
,
sortings
1300
x6961
839E
Mother of Dragons
brute force
,
graphs
,
math
,
meet-in-the-middle
2700
x888
839D
Winter is here
combinatorics
,
dp
,
math
,
number theory
2200
x2700
838D
Airplane Arrangements
math
,
number theory
2700
x821
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x744
837E
Vasya's Function
binary search
,
implementation
,
math
2100
x1518
837D
Round Subset
dp
,
math
2100
x4877
835A
Key races
math
800
x19965
833C
Ever-Hungry Krakozyabra
brute force
,
combinatorics
,
greedy
,
math
2700
x461
833A
The Meaningless Game
math
,
number theory
1700
x6035
832C
Strange Radiation
binary search
,
implementation
,
math
2500
x428
832A
Sasha and Sticks
games
,
math
800
x20421
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x273
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1188
827E
Rusty String
fft
,
math
,
strings
2700
x796
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x2968
822A
I'm bored with life
implementation
,
math
,
number theory
800
x31856
821B
Okabe and Banana Trees
brute force
,
math
1300
x5649
820B
Mister B and Angle in Polygon
constructive algorithms
,
geometry
,
math
1300
x5089
819B
Mister B and PR Shifts
data structures
,
implementation
,
math
1900
x1625
818F
Level Generation
binary search
,
math
,
ternary search
2100
x1351
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