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Before contest
Codeforces Round 937 (Div. 4)
04:18:14
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Difficulty:
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dp
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
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x521
946D
Timetable
dp
1800
x4231
940E
Cashback
data structures
,
dp
,
greedy
,
math
2000
x3370
940B
Our Tanya is Crying Out Loud
dp
,
greedy
1400
x8599
939F
Cutlet
data structures
,
dp
2400
x846
938F
Erasing Substrings
bitmasks
,
dp
,
greedy
2700
x463
936D
World of Tank
dp
,
greedy
3000
x320
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x3019
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x859
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x184
933A
A Twisty Movement
dp
1800
x4747
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x861
932F
Escape Through Leaf
data structures
,
dp
,
geometry
2700
x2429
932E
Team Work
combinatorics
,
dp
,
math
2400
x2637
932D
Tree
binary search
,
dp
,
trees
2200
x1635
930E
Coins Exhibition
data structures
,
dp
,
math
2900
x394
930C
Teodor is not a liar!
data structures
,
dp
1900
x2061
928B
Chat
*special problem
,
dp
1400
x2479
924F
Minimal Subset Difference
dp
3200
x155
924C
Riverside Curio
data structures
,
dp
,
greedy
1700
x3665
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x611
922E
Birds
dp
2200
x1994
920D
Tanks
dp
,
greedy
,
implementation
2400
x679
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x9189
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x26336
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x983
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x367
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3463
917A
The Monster
dp
,
greedy
,
implementation
,
math
1800
x3417
915C
Permute Digits
dp
,
greedy
1700
x6844
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x225
914G
Sum the Fibonacci
bitmasks
,
divide and conquer
,
dp
,
fft
,
math
2600
x886
914C
Travelling Salesman and Special Numbers
brute force
,
combinatorics
,
dp
1800
x3563
913F
Strongly Connected Tournament
dp
,
graphs
,
math
,
probabilities
2800
x599
913E
Logical Expression
bitmasks
,
dp
,
shortest paths
2400
x738
913C
Party Lemonade
bitmasks
,
dp
,
greedy
1600
x7712
910A
The Way to Home
dfs and similar
,
dp
,
greedy
,
implementation
800
x11250
909E
Coprocessor
dfs and similar
,
dp
,
graphs
,
greedy
1900
x1944
909C
Python Indentation
dp
1800
x4709
908G
New Year and Original Order
dp
,
math
2800
x1269
908E
New Year and Entity Enumeration
bitmasks
,
combinatorics
,
dp
,
math
2500
x731
908D
New Year and Arbitrary Arrangement
dp
,
math
,
probabilities
2200
x2223
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x408
906C
Party
bitmasks
,
brute force
,
dp
,
graphs
2400
x1173
903F
Clear The Matrix
bitmasks
,
dp
2200
x618
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1018
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x2950
895C
Square Subsets
bitmasks
,
combinatorics
,
dp
,
math
2000
x5015
894E
Ralph and Mushrooms
dp
,
graphs
2100
x2099
894A
QAQ
brute force
,
dp
800
x32416
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x3199
893D
Credit Card
data structures
,
dp
,
greedy
,
implementation
1900
x2893
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x166
891A
Pride
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x9466
889E
Mod Mod Mod
binary search
,
dp
,
math
3000
x511
888F
Connecting Vertices
dp
,
graphs
2500
x738
888D
Almost Identity Permutations
combinatorics
,
dp
,
math
1600
x7492
886E
Maximum Element
combinatorics
,
dp
,
math
2400
x965
883I
Photo Processing
binary search
,
dp
1900
x1873
883D
Packmen Strike Back
binary search
,
dp
,
math
2500
x348
878E
Numbers on the blackboard
combinatorics
,
dp
3300
x468
877B
Nikita and string
brute force
,
dp
1500
x9899
875E
Delivery Club
binary search
,
data structures
,
dp
2600
x847
873E
Awards For Contestants
brute force
,
data structures
,
dp
2300
x482
873B
Balanced Substring
dp
,
implementation
1500
x7360
870C
Maximum splitting
dp
,
greedy
,
math
,
number theory
1300
x8923
869C
The Intriguing Obsession
combinatorics
,
dp
,
math
1800
x4313
868F
Yet Another Minimization Problem
divide and conquer
,
dp
2500
x3344
868E
Policeman and a Tree
dp
,
graphs
,
trees
2700
x439
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x887
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4502
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x116
865C
Gotta Go Fast
binary search
,
dp
2400
x787
864E
Fire
dp
,
sortings
2000
x4092
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x846
859C
Pie Rules
dp
,
games
1500
x5193
858C
Did you mean...
dp
,
greedy
,
implementation
1500
x5414
856D
Masha and Cactus
dp
,
trees
2400
x360
856C
Eleventh Birthday
combinatorics
,
dp
,
math
2400
x516
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x474
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x197
855E
Salazar Slytherin's Locket
bitmasks
,
dp
2200
x1584
855C
Helga Hufflepuff's Cup
dp
,
trees
2000
x1959
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8294
853D
Michael and Charging Stations
binary search
,
dp
,
greedy
2400
x649
852H
Bob and stages
dp
,
geometry
3000
x142
852E
Casinos and travel
dp
2100
x806
852B
Neural Network country
dp
,
matrices
2000
x1338
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x365
850C
Arpa and a game with Mojtaba
bitmasks
,
dp
,
games
2200
x1328
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x197
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x358
847E
Packmen
binary search
,
dp
1800
x2652
846C
Four Segments
brute force
,
data structures
,
dp
1800
x2600
845F
Guards In The Storehouse
bitmasks
,
dp
2500
x410
845D
Driving Test
data structures
,
dp
,
greedy
1800
x2320
840C
On the Bench
combinatorics
,
dp
2500
x1617
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2227
839D
Winter is here
combinatorics
,
dp
,
math
,
number theory
2200
x2663
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x15678
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