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Rayan
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Before contest
Codeforces Round 1006 (Div. 3)
26:24:24
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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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Problems
#
Name
630L
Cracking the Code
implementation
,
math
1400
x3654
630K
Indivisibility
math
,
number theory
1500
x5533
630J
Divisibility
math
,
number theory
1100
x11594
630I
Parking Lot
combinatorics
,
math
1700
x7088
630H
Benches
combinatorics
,
math
1400
x5128
630G
Challenge Pennants
combinatorics
,
math
1600
x2908
630F
Selection of Personnel
combinatorics
,
math
1300
x7122
630E
A rectangle
math
1900
x2381
630D
Hexagons!
math
1100
x11357
630C
Lucky Numbers
combinatorics
,
math
1100
x23104
630B
Moore's Law
math
1200
x7626
630A
Again Twenty Five!
number theory
800
x73961
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x1044
629D
Babaei and Birthday Cake
data structures
,
dp
2000
x4137
629C
Famil Door and Brackets
dp
,
strings
2000
x2856
629B
Far Relative’s Problem
brute force
1100
x8097
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13734
628F
Bear and Fair Set
flows
,
graphs
2500
x818
628E
Zbazi in Zeydabad
data structures
,
implementation
2300
x946
628D
Magic Numbers
dp
2200
x6378
628C
Bear and String Distance
greedy
,
strings
1300
x5939
628B
New Skateboard
dp
1300
x11222
628A
Tennis Tournament
implementation
,
math
1000
x6552
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x243
627E
Orchestra
two pointers
3000
x606
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x895
627C
Package Delivery
data structures
,
divide and conquer
,
greedy
2200
x1199
627B
Factory Repairs
data structures
1700
x2986
627A
XOR Equation
dp
,
math
1700
x4292
626G
Raffles
data structures
,
dp
,
greedy
,
math
3100
x549
626F
Group Projects
dp
2400
x3098
626E
Simple Skewness
binary search
,
math
,
ternary search
2400
x1432
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2792
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4395
626B
Cards
constructive algorithms
,
dp
,
math
1300
x6662
626A
Robot Sequence
brute force
,
implementation
1000
x6308
625E
Frog Fights
data structures
,
greedy
2800
x349
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x642
625C
K-special Tables
constructive algorithms
,
implementation
1300
x6877
625B
War of the Corporations
constructive algorithms
,
greedy
,
strings
1200
x10651
625A
Guest From the Past
implementation
,
math
1700
x5435
624B
Making a String
greedy
,
sortings
1100
x8033
624A
Save Luke
math
800
x10579
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x564
623D
Birthday
greedy
,
math
,
probabilities
2700
x502
623C
Electric Charges
binary search
,
dp
2900
x483
623B
Array GCD
dp
,
greedy
,
number theory
2300
x2219
623A
Graph and String
constructive algorithms
,
graphs
1800
x4533
622F
The Sum of the k-th Powers
math
2600
x4101
622E
Ants in Leaves
dfs and similar
,
greedy
,
sortings
,
trees
2200
x2176
622D
Optimal Number Permutation
constructive algorithms
1900
x3051
622C
Not Equal on a Segment
data structures
,
implementation
1700
x6877
622B
The Time
implementation
900
x9851
622A
Infinite Sequence
implementation
,
math
1000
x9587
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2907
621D
Rat Kwesh and Cheese
brute force
,
constructive algorithms
,
math
2400
x1005
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5658
621B
Wet Shark and Bishops
combinatorics
,
implementation
1300
x11146
621A
Wet Shark and Odd and Even
implementation
900
x21101
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x757
620E
New Year Tree
bitmasks
,
data structures
,
trees
2100
x5976
620D
Professor GukiZ and Two Arrays
binary search
,
two pointers
2200
x1786
620C
Pearls in a Row
greedy
1500
x7061
620B
Grandfather Dovlet’s calculator
implementation
1000
x9822
620A
Professor GukiZ's Robot
implementation
,
math
800
x13498
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x248
618F
Double Knapsack
constructive algorithms
,
two pointers
3000
x1484
618E
Robot Arm
data structures
,
geometry
2500
x651
618D
Hamiltonian Spanning Tree
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
2200
x1773
618C
Constellation
geometry
,
implementation
1600
x4363
618B
Guess the Permutation
constructive algorithms
1100
x8049
618A
Slime Combining
implementation
800
x8447
617E
XOR and Favorite Number
data structures
2200
x8829
617D
Polyline
constructive algorithms
,
implementation
1700
x4244
617C
Watering Flowers
implementation
1600
x4931
617B
Chocolate
combinatorics
1300
x18400
617A
Elephant
math
800
x200604
616F
Expensive Strings
data structures
,
sortings
,
string suffix structures
,
strings
2700
x617
616E
Sum of Remainders
implementation
,
math
,
number theory
2200
x3054
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x10275
616C
The Labyrinth
dfs and similar
1600
x6005
616B
Dinner with Emma
games
,
greedy
1000
x12194
616A
Comparing Two Long Integers
implementation
,
strings
900
x10085
615E
Hexagons
binary search
,
implementation
,
math
2100
x996
615D
Multipliers
math
,
number theory
2000
x4006
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2360
615B
Longtail Hedgehog
dp
,
graphs
1600
x5221
615A
Bulbs
implementation
800
x17834
614B
Gena's Code
implementation
,
math
1400
x6995
614A
Link/Cut Tree
brute force
,
implementation
1500
x7528
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x476
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x3236
613C
Necklace
constructive algorithms
,
math
2500
x1027
613B
Skills
binary search
,
brute force
,
dp
,
greedy
,
sortings
,
two pointers
1900
x2256
613A
Peter and Snow Blower
binary search
,
geometry
,
ternary search
1900
x3263
612F
Simba on the Circle
dp
2600
x399
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1756
612D
The Union of k-Segments
greedy
,
sortings
1800
x3968
612C
Replace To Make Regular Bracket Sequence
data structures
,
expression parsing
,
math
1400
x8393
612B
HDD is Outdated Technology
implementation
,
math
1200
x7205
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