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Codeforces Round 987 (Div. 2)
13:40:53
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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
61E
Enemy is weak
data structures
,
trees
1900
x11301
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6614
61C
Capture Valerian
math
2000
x718
60E
Mushroom Gnomes
math
,
matrices
2600
x327
60D
Savior
brute force
,
dsu
,
math
2500
x448
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x567
60B
Serial Time!
dfs and similar
,
dsu
1400
x4668
59E
Shortest Path
graphs
,
shortest paths
2000
x3470
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x636
59C
Title
expression parsing
1600
x2110
58E
Expression
dp
2400
x393
58D
Calendar
greedy
,
strings
2000
x734
58C
Trees
brute force
1800
x2041
57E
Chess
math
,
shortest paths
3000
x263
57D
Journey
dp
,
math
2500
x342
57C
Array
combinatorics
,
math
1900
x2681
57B
Martian Architecture
implementation
1600
x1022
56E
Domino Principle
binary search
,
data structures
,
sortings
2200
x2363
56D
Changing a String
dp
2100
x1647
56C
Corporation Mail
data structures
,
expression parsing
,
implementation
1700
x1172
55E
Very simple problem
geometry
,
two pointers
2500
x706
55D
Beautiful numbers
dp
,
number theory
2500
x3932
55C
Pie or die
games
1900
x1655
55B
Smallest number
brute force
1600
x2873
54E
Vacuum Сleaner
geometry
2700
x194
54D
Writing a Song
brute force
,
dp
,
strings
2100
x546
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1326
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x776
53E
Dead Ends
bitmasks
,
dp
2500
x1002
53D
Physical Education
sortings
1500
x2045
53B
Blog Photo
binary search
,
implementation
1700
x1417
52C
Circular RMQ
data structures
2200
x9037
52B
Right Triangles
combinatorics
1600
x2067
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x628
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x410
51D
Geometrical problem
implementation
2200
x482
51C
Three Base Stations
binary search
,
greedy
1800
x2009
51B
bHTML Tables Analisys
expression parsing
1700
x874
50E
Square Equation Roots
math
2300
x363
50D
Bombing
binary search
,
dp
,
probabilities
2100
x631
50C
Happy Farm 5
geometry
2000
x771
50B
Choosing Symbol Pairs
strings
1500
x5716
49E
Common ancestor
dp
2300
x678
49D
Game
brute force
,
dp
,
implementation
1800
x1919
49C
Disposition
constructive algorithms
,
math
1700
x1695
49B
Sum
math
1500
x2492
48H
Black and White
constructive algorithms
2800
x152
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x277
48F
Snow sellers
greedy
,
sortings
2800
x160
48E
Ivan the Fool VS Gorynych the Dragon
dp
,
games
,
graphs
2100
x588
48D
Permutations
greedy
1500
x2530
48C
The Race
math
1800
x784
47E
Cannon
data structures
,
geometry
,
sortings
2200
x369
47D
Safe
brute force
2200
x780
47C
Crossword
implementation
2000
x790
46G
Emperor's Problem
geometry
2500
x117
46F
Hercule Poirot Problem
dsu
,
graphs
2300
x330
46E
Comb
data structures
,
dp
1900
x965
46D
Parking Lot
data structures
,
implementation
1800
x984
46C
Hamsters and Tigers
two pointers
1600
x2455
45J
Planting Trees
constructive algorithms
1800
x946
45I
TCMCF+++
greedy
1400
x2492
45H
Road Problem
graphs
2100
x193
45G
Prime Problem
number theory
2200
x1050
45F
Goats and Wolves
greedy
2500
x145
45E
Director
constructive algorithms
,
greedy
2000
x549
45D
Event Dates
greedy
,
meet-in-the-middle
,
sortings
1900
x1700
45C
Dancing Lessons
data structures
1900
x916
45B
School
dp
,
dsu
2200
x282
44J
Triminoes
constructive algorithms
,
greedy
2000
x576
44I
Toys
brute force
,
combinatorics
2300
x195
44H
Phone Number
dp
1700
x1750
44G
Shooting Gallery
data structures
,
implementation
2500
x409
44F
BerPaint
geometry
,
graphs
2700
x68
44E
Anfisa the Monkey
dp
1400
x5168
44D
Hyperdrive
math
1800
x716
44B
Cola
implementation
1500
x2008
43E
Race
brute force
,
implementation
,
two pointers
2300
x395
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1089
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x206
42D
Strange town
constructive algorithms
,
math
2300
x410
42C
Safe cracking
brute force
,
constructive algorithms
2200
x488
42B
Game of chess unfinished
implementation
1700
x955
42A
Guilty --- to the kitchen!
greedy
,
implementation
1400
x2858
41E
3-cycles
constructive algorithms
,
graphs
,
greedy
1900
x1978
41D
Pawn
dp
1900
x2430
41B
Martian Dollar
brute force
1400
x4054
40E
Number Table
combinatorics
2500
x685
40D
Interesting Sequence
math
2600
x142
40C
Berland Square
implementation
,
math
2300
x253
40B
Repaintings
math
1600
x1173
39K
Testing
2600
x86
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x3000
39I
Tram
2500
x143
39G
Inverse Function
implementation
2400
x130
39E
What Has Dirichlet Got to Do with That?
dp
,
games
2000
x884
39C
Moon Craters
dp
,
sortings
2100
x605
39A
C*++ Calculations
expression parsing
,
greedy
2000
x704
38H
The Great Marathon
dp
2400
x289
38G
Queue
data structures
2300
x709
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