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Codeforces Round 945 (Div. 2)
3 days
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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
63D
Dividing Island
constructive algorithms
1900
x1211
63C
Bulls and Cows
brute force
,
implementation
1700
x1627
63B
Settlers' Training
implementation
1200
x4713
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x10882
62E
World Evil
dp
,
flows
2700
x218
62D
Wormhouse
dfs and similar
,
graphs
2300
x349
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x247
62B
Tyndex.Brome
binary search
,
implementation
1800
x1263
62A
A Student's Dream
greedy
,
math
1300
x3368
61E
Enemy is weak
data structures
,
trees
1900
x10103
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6249
61C
Capture Valerian
math
2000
x692
61B
Hard Work
strings
1300
x3784
61A
Ultra-Fast Mathematician
implementation
800
x103880
60E
Mushroom Gnomes
math
,
matrices
2600
x316
60D
Savior
brute force
,
dsu
,
math
2500
x395
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x549
60B
Serial Time!
dfs and similar
,
dsu
1400
x4445
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3529
59E
Shortest Path
graphs
,
shortest paths
2000
x3127
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x603
59C
Title
expression parsing
1600
x2005
59B
Fortune Telling
implementation
,
number theory
1200
x6666
59A
Word
implementation
,
strings
800
x162620
58E
Expression
dp
2400
x348
58D
Calendar
greedy
,
strings
2000
x713
58C
Trees
brute force
1800
x1964
58B
Coins
greedy
1300
x11827
58A
Chat room
greedy
,
strings
1000
x122452
57E
Chess
math
,
shortest paths
3000
x250
57D
Journey
dp
,
math
2500
x329
57C
Array
combinatorics
,
math
1900
x2327
57B
Martian Architecture
implementation
1600
x987
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2815
56E
Domino Principle
binary search
,
data structures
,
sortings
2200
x2213
56D
Changing a String
dp
2100
x1528
56C
Corporation Mail
data structures
,
expression parsing
,
implementation
1700
x1118
56B
Spoilt Permutation
implementation
1300
x3619
56A
Bar
implementation
1000
x8341
55E
Very simple problem
geometry
,
two pointers
2500
x674
55D
Beautiful numbers
dp
,
number theory
2500
x3610
55C
Pie or die
games
1900
x1580
55B
Smallest number
brute force
1600
x2635
55A
Flea travel
implementation
,
math
1200
x3340
54E
Vacuum Сleaner
geometry
2700
x187
54D
Writing a Song
brute force
,
dp
,
strings
2100
x506
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1244
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x737
54A
Presents
implementation
1300
x2008
53E
Dead Ends
bitmasks
,
dp
2500
x904
53D
Physical Education
sortings
1500
x1923
53C
Little Frog
constructive algorithms
1200
x6218
53B
Blog Photo
binary search
,
implementation
1700
x1363
53A
Autocomplete
implementation
1100
x4838
52C
Circular RMQ
data structures
2200
x8187
52B
Right Triangles
combinatorics
1600
x1979
52A
123-sequence
implementation
900
x8304
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x545
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x364
51D
Geometrical problem
implementation
2200
x417
51C
Three Base Stations
binary search
,
greedy
1800
x1810
51B
bHTML Tables Analisys
expression parsing
1700
x847
51A
Cheaterius's Problem
implementation
1300
x1780
50E
Square Equation Roots
math
2300
x345
50D
Bombing
binary search
,
dp
,
probabilities
2100
x596
50C
Happy Farm 5
geometry
2000
x725
50B
Choosing Symbol Pairs
strings
1500
x5539
50A
Domino piling
greedy
,
math
800
x229397
49E
Common ancestor
dp
2300
x649
49D
Game
brute force
,
dp
,
implementation
1800
x1834
49C
Disposition
constructive algorithms
,
math
1700
x1644
49B
Sum
math
1500
x2390
49A
Sleuth
implementation
800
x12911
48H
Black and White
constructive algorithms
2800
x134
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x254
48F
Snow sellers
greedy
,
sortings
2800
x133
48E
Ivan the Fool VS Gorynych the Dragon
dp
,
games
,
graphs
2100
x562
48D
Permutations
greedy
1500
x2412
48C
The Race
math
1800
x756
48B
Land Lot
brute force
,
implementation
1200
x2604
48A
Rock-paper-scissors
implementation
,
schedules
900
x5631
47E
Cannon
data structures
,
geometry
,
sortings
2200
x353
47D
Safe
brute force
2200
x745
47C
Crossword
implementation
2000
x740
47B
Coins
implementation
1200
x13064
47A
Triangular numbers
brute force
,
math
800
x14330
46G
Emperor's Problem
geometry
2500
x109
46F
Hercule Poirot Problem
dsu
,
graphs
2300
x308
46E
Comb
data structures
,
dp
1900
x925
46D
Parking Lot
data structures
,
implementation
1800
x959
46C
Hamsters and Tigers
two pointers
1600
x2217
46B
T-shirts from Sponsor
implementation
1100
x3540
46A
Ball Game
brute force
,
implementation
800
x8384
45J
Planting Trees
constructive algorithms
1800
x888
45I
TCMCF+++
greedy
1400
x2304
45H
Road Problem
graphs
2100
x174
45G
Prime Problem
number theory
2200
x994
45F
Goats and Wolves
greedy
2500
x123
45E
Director
constructive algorithms
,
greedy
2000
x523
45D
Event Dates
greedy
,
meet-in-the-middle
,
sortings
1900
x1598
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