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Before contest
Codeforces Round 974 (Div. 3)
09:56:37
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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
865A
Save the problem!
constructive algorithms
1400
x4324
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x616
864E
Fire
dp
,
sortings
2000
x4231
864D
Make a Permutation!
greedy
,
implementation
,
math
1500
x5988
864C
Bus
greedy
,
implementation
,
math
1500
x5851
864B
Polycarp and Letters
brute force
,
implementation
,
strings
1000
x9096
864A
Fair Game
implementation
,
sortings
1000
x11635
863G
Graphic Settings
3200
x55
863F
Almost Permutation
flows
2200
x1240
863E
Turn Off The TV
data structures
,
sortings
2000
x3082
863D
Yet Another Array Queries Problem
data structures
,
implementation
1800
x3238
863C
1-2-3
graphs
,
implementation
1800
x2489
863B
Kayaking
brute force
,
greedy
,
sortings
1500
x8181
863A
Quasi-palindrome
brute force
,
implementation
900
x10144
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x202
862E
Mahmoud and Ehab and the function
binary search
,
data structures
,
sortings
2100
x1622
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1864
862C
Mahmoud and Ehab and the xor
constructive algorithms
1900
x4052
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x17364
862A
Mahmoud and Ehab and the MEX
greedy
,
implementation
1000
x9473
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x432
859G
Circle of Numbers
math
3000
x157
859F
Ordering T-Shirts
greedy
2800
x182
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1849
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x1048
859C
Pie Rules
dp
,
games
1500
x5378
859B
Lazy Security Guard
brute force
,
geometry
,
math
1000
x7014
859A
Declined Finalists
greedy
,
implementation
800
x7700
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2300
x1566
858E
Tests Renumeration
greedy
,
implementation
2200
x504
858D
Polycarp's phone book
data structures
,
implementation
,
sortings
1600
x3822
858C
Did you mean...
dp
,
greedy
,
implementation
1500
x5614
858B
Which floor?
brute force
,
implementation
1500
x3725
858A
k-rounding
brute force
,
math
,
number theory
1100
x7978
856F
To Play or not to Play
greedy
3000
x104
856E
Satellites
3100
x71
856D
Masha and Cactus
dp
,
trees
2400
x401
856C
Eleventh Birthday
combinatorics
,
dp
,
math
2400
x566
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x499
856A
Set Theory
brute force
,
constructive algorithms
1600
x1424
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x207
855F
Nagini
binary search
,
data structures
3100
x449
855E
Salazar Slytherin's Locket
bitmasks
,
dp
2200
x1763
855D
Rowena Ravenclaw's Diadem
trees
2500
x522
855C
Helga Hufflepuff's Cup
dp
,
trees
2000
x2058
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8582
855A
Tom Riddle's Diary
brute force
,
implementation
,
strings
800
x21448
854B
Maxim Buys an Apartment
constructive algorithms
,
math
1200
x8186
854A
Fraction
brute force
,
constructive algorithms
,
math
800
x13587
853E
Lada Malina
data structures
,
geometry
3400
x65
853D
Michael and Charging Stations
binary search
,
dp
,
greedy
2400
x667
853C
Boredom
data structures
2100
x1480
853B
Jury Meeting
greedy
,
sortings
,
two pointers
1800
x2517
853A
Planning
greedy
1500
x5839
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x574
852H
Bob and stages
dp
,
geometry
3000
x150
852G
Bathroom terminal
implementation
1700
x1281
852F
Product transformation
combinatorics
,
math
,
number theory
2200
x570
852E
Casinos and travel
dp
2100
x1042
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x988
852C
Property
greedy
,
sortings
2100
x577
852B
Neural Network country
dp
,
matrices
2000
x1436
852A
Digits
brute force
,
implementation
,
math
2500
x385
851B
Arpa and an exam about geometry
geometry
,
math
1400
x5481
851A
Arpa and a research in Mexican wave
implementation
,
math
800
x9668
850F
Rainbow Balls
math
2800
x655
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x386
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x386
850C
Arpa and a game with Mojtaba
bitmasks
,
dp
,
games
2200
x1473
850B
Arpa and a list of numbers
implementation
,
number theory
2100
x2023
850A
Five Dimensional Points
brute force
,
geometry
,
math
1700
x3187
849B
Tell Your World
brute force
,
geometry
1600
x3632
849A
Odds and Ends
implementation
1000
x9048
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x208
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x382
848C
Goodbye Souvenir
data structures
,
divide and conquer
2600
x1362
848B
Rooter's Song
constructive algorithms
,
data structures
,
geometry
,
implementation
,
sortings
,
two pointers
1900
x1889
848A
From Y to Y
constructive algorithms
1600
x5116
847M
Weather Tomorrow
implementation
,
math
1000
x6263
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x320
847K
Travel Cards
greedy
,
implementation
,
sortings
1800
x1678
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x628
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1520
847H
Load Testing
greedy
1600
x2386
847G
University Classes
implementation
900
x6694
847F
Berland Elections
greedy
,
sortings
2100
x861
847E
Packmen
binary search
,
dp
1800
x2945
847D
Dog Show
constructive algorithms
,
data structures
,
greedy
2200
x1205
847C
Sum of Nestings
constructive algorithms
1800
x2358
847B
Preparing for Merge Sort
binary search
,
data structures
1600
x4934
847A
Union of Doubly Linked Lists
implementation
1500
x3351
846F
Random Query
data structures
,
math
,
probabilities
,
two pointers
1800
x2248
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2300
x886
846D
Monitor
binary search
,
data structures
1900
x2462
846C
Four Segments
brute force
,
data structures
,
dp
1800
x2664
846B
Math Show
brute force
,
greedy
1800
x2505
846A
Curriculum Vitae
brute force
,
implementation
1500
x4230
845G
Shortest Path Problem?
dfs and similar
,
graphs
,
math
2300
x1607
845F
Guards In The Storehouse
bitmasks
,
dp
2500
x447
845E
Fire in the City
binary search
,
data structures
2400
x597
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