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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
13:23:24
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combine-tags-by-or
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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
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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Custom test
Problems
#
Name
333C
Lucky Tickets
brute force
,
constructive algorithms
2700
x392
333B
Chips
greedy
1800
x2656
333A
Secrets
greedy
1600
x4058
332E
Binary Key
dp
,
greedy
,
implementation
2400
x305
332D
Theft of Blueprints
graphs
,
math
2400
x386
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x935
332B
Maximum Absurdity
data structures
,
dp
,
implementation
1500
x8084
332A
Down the Hatch!
implementation
1300
x3589
331E2
Deja Vu
constructive algorithms
,
dp
3100
x218
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x165
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x179
331D2
Escaping on Beaveractor
graphs
2600
x136
331D1
Escaping on Beaveractor
dfs and similar
,
implementation
2400
x206
331C3
The Great Julya Calendar
dp
2500
x503
331C2
The Great Julya Calendar
dp
2400
x394
331C1
The Great Julya Calendar
dp
1100
x6262
331B2
Shave Beaver!
data structures
1900
x743
331B1
Shave Beaver!
implementation
1700
x757
331A2
Oh Sweet Beaverette
data structures
,
sortings
1500
x1428
331A1
Oh Sweet Beaverette
brute force
,
implementation
1400
x1396
330B
Road Construction
constructive algorithms
,
graphs
1300
x17331
330A
Cakeminator
brute force
,
implementation
800
x28943
329E
Evil
math
3100
x169
329D
The Evil Temple and the Moving Rocks
constructive algorithms
2500
x408
329C
Graph Reconstruction
constructive algorithms
2400
x917
329B
Biridian Forest
dfs and similar
,
shortest paths
1500
x6550
329A
Purification
constructive algorithms
,
greedy
1500
x4657
328B
Sheldon and Ice Pieces
greedy
1500
x1361
328A
IQ Test
implementation
1800
x2126
327E
Axis Walking
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
meet-in-the-middle
2300
x1428
327D
Block Tower
constructive algorithms
,
dfs and similar
,
graphs
1900
x2299
327C
Magic Five
combinatorics
,
math
1700
x3235
327B
Hungry Sequence
math
1200
x19959
327A
Flipping Game
brute force
,
dp
,
implementation
1200
x42812
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x839
325D
Reclamation
dsu
2900
x544
325C
Monsters and Diamonds
dfs and similar
,
graphs
,
shortest paths
2600
x350
325B
Stadium and Games
binary search
,
math
1800
x1582
325A
Square and Rectangles
implementation
1500
x2166
323C
Two permutations
data structures
2400
x610
323B
Tournament-graph
constructive algorithms
,
graphs
2200
x406
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x763
322B
Ciel and Flowers
combinatorics
,
math
1600
x11913
322A
Ciel and Dancing
greedy
1000
x8258
321E
Ciel and Gondolas
data structures
,
divide and conquer
,
dp
2600
x5115
321D
Ciel and Flipboard
dp
,
greedy
,
math
2900
x549
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x7533
321B
Ciel and Duel
dp
,
flows
,
greedy
1900
x3172
321A
Ciel and Robot
binary search
,
implementation
,
math
1700
x3653
320B
Ping-Pong (Easy Version)
dfs and similar
,
graphs
1500
x7302
320A
Magic Numbers
brute force
,
greedy
900
x39415
319E
Ping-Pong
data structures
3000
x666
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x669
319C
Kalila and Dimna in the Logging Industry
dp
,
geometry
2100
x5342
319B
Psychos in a Line
data structures
,
implementation
1900
x4229
319A
Malek Dance Club
combinatorics
,
math
1600
x2841
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x7732
318A
Even Odds
math
900
x117508
317E
Princess and Her Shadow
constructive algorithms
,
shortest paths
3100
x157
317D
Game with Powers
dp
,
games
2300
x1091
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x510
317B
Ants
brute force
,
implementation
2000
x1607
317A
Perfect Pair
brute force
1600
x4682
316G3
Good Substrings
string suffix structures
2400
x501
316G2
Good Substrings
string suffix structures
2200
x475
316G1
Good Substrings
hashing
,
strings
1700
x970
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x183
316F2
Suns and Rays
2300
x167
316F1
Suns and Rays
dfs and similar
,
implementation
2200
x181
316E3
Summer Homework
data structures
,
math
2300
x533
316E2
Summer Homework
data structures
,
math
2300
x400
316E1
Summer Homework
brute force
,
data structures
1500
x1486
316D3
PE Lesson
dp
,
math
2400
x609
316D2
PE Lesson
dp
2300
x464
316D1
PE Lesson
brute force
,
dp
2300
x535
316C2
Tidying Up
flows
,
graph matchings
2300
x637
316C1
Tidying Up
flows
2200
x559
316B2
EKG
dfs and similar
,
dp
1600
x1598
316B1
EKG
brute force
,
dfs and similar
1500
x1387
316A2
Special Task
math
1400
x2159
316A1
Special Task
greedy
1100
x2693
315B
Sereja and Array
implementation
1200
x7055
315A
Sereja and Bottles
brute force
1400
x11278
314E
Sereja and Squares
dp
2900
x372
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x533
314C
Sereja and Subsequences
data structures
,
dp
2000
x1843
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1525
314A
Sereja and Contest
implementation
1600
x2083
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x556
313D
Ilya and Roads
dp
2100
x1485
313C
Ilya and Matrix
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x5670
313B
Ilya and Queries
dp
,
implementation
1100
x45455
313A
Ilya and Bank Account
implementation
,
number theory
900
x57373
312B
Archer
math
,
probabilities
1300
x11774
312A
Whose sentence is it?
implementation
,
strings
1100
x5005
311E
Biologist
flows
2300
x1223
311D
Interval Cubing
data structures
,
math
2600
x675
311C
Fetch the Treasure
brute force
,
data structures
,
graphs
,
shortest paths
2500
x489
311B
Cats Transport
data structures
,
dp
2400
x3521
311A
The Closest Pair
constructive algorithms
,
implementation
1300
x4041
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