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Educational Codeforces Round 166 (Rated for Div. 2)
19:20:43
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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
68C
Synchrophasotron
brute force
2200
x305
68B
Energy exchange
binary search
1600
x4155
68A
Irrational problem
implementation
,
number theory
1100
x4828
67E
Save the City!
geometry
2500
x313
67D
Optical Experiment
binary search
,
data structures
,
dp
1900
x1345
67C
Sequence of Balls
dp
2600
x630
67B
Restoration of the Permutation
greedy
1800
x756
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2061
66E
Petya and Post
data structures
,
dp
2000
x687
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3062
66C
Petya and File System
data structures
,
implementation
1800
x998
66B
Petya and Countryside
brute force
,
implementation
1100
x19601
66A
Petya and Java
implementation
,
strings
1300
x6233
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x86
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x421
65C
Harry Potter and the Golden Snitch
binary search
,
geometry
2100
x773
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1322
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1786
64I
Sort the Table
*special problem
,
sortings
2400
x85
64H
Table Bowling
*special problem
,
sortings
2300
x111
64G
Path Canonization
*special problem
2200
x117
64F
Domain
*special problem
,
expression parsing
2000
x176
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x235
64D
Presents
*special problem
,
greedy
1800
x282
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x332
64B
Expression
*special problem
,
expression parsing
1500
x1000
64A
Factorial
*special problem
,
implementation
1300
x2713
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x717
63D
Dividing Island
constructive algorithms
1900
x1226
63C
Bulls and Cows
brute force
,
implementation
1700
x1637
63B
Settlers' Training
implementation
1200
x4722
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x10927
62E
World Evil
dp
,
flows
2700
x223
62D
Wormhouse
dfs and similar
,
graphs
2300
x350
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x248
62B
Tyndex.Brome
binary search
,
implementation
1800
x1264
62A
A Student's Dream
greedy
,
math
1300
x3379
61E
Enemy is weak
data structures
,
trees
1900
x10192
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6280
61C
Capture Valerian
math
2000
x695
61B
Hard Work
strings
1300
x3793
61A
Ultra-Fast Mathematician
implementation
800
x104466
60E
Mushroom Gnomes
math
,
matrices
2600
x317
60D
Savior
brute force
,
dsu
,
math
2500
x397
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x552
60B
Serial Time!
dfs and similar
,
dsu
1400
x4457
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3537
59E
Shortest Path
graphs
,
shortest paths
2000
x3157
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x606
59C
Title
expression parsing
1600
x2016
59B
Fortune Telling
implementation
,
number theory
1200
x6708
59A
Word
implementation
,
strings
800
x163756
58E
Expression
dp
2400
x349
58D
Calendar
greedy
,
strings
2000
x714
58C
Trees
brute force
1800
x1972
58B
Coins
greedy
1300
x11857
58A
Chat room
greedy
,
strings
1000
x123133
57E
Chess
math
,
shortest paths
3000
x251
57D
Journey
dp
,
math
2500
x330
57C
Array
combinatorics
,
math
1900
x2346
57B
Martian Architecture
implementation
1600
x989
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2820
56E
Domino Principle
binary search
,
data structures
,
sortings
2200
x2227
56D
Changing a String
dp
2100
x1536
56C
Corporation Mail
data structures
,
expression parsing
,
implementation
1700
x1121
56B
Spoilt Permutation
implementation
1300
x3630
56A
Bar
implementation
1000
x8356
55E
Very simple problem
geometry
,
two pointers
2500
x678
55D
Beautiful numbers
dp
,
number theory
2500
x3620
55C
Pie or die
games
1900
x1591
55B
Smallest number
brute force
1600
x2650
55A
Flea travel
implementation
,
math
1200
x3344
54E
Vacuum Сleaner
geometry
2700
x188
54D
Writing a Song
brute force
,
dp
,
strings
2100
x511
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1249
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x740
54A
Presents
implementation
1300
x2011
53E
Dead Ends
bitmasks
,
dp
2500
x907
53D
Physical Education
sortings
1500
x1942
53C
Little Frog
constructive algorithms
1200
x6235
53B
Blog Photo
binary search
,
implementation
1700
x1370
53A
Autocomplete
implementation
1100
x4855
52C
Circular RMQ
data structures
2200
x8271
52B
Right Triangles
combinatorics
1600
x1983
52A
123-sequence
implementation
900
x8348
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x548
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x368
51D
Geometrical problem
implementation
2200
x419
51C
Three Base Stations
binary search
,
greedy
1800
x1824
51B
bHTML Tables Analisys
expression parsing
1700
x851
51A
Cheaterius's Problem
implementation
1300
x1785
50E
Square Equation Roots
math
2300
x347
50D
Bombing
binary search
,
dp
,
probabilities
2100
x597
50C
Happy Farm 5
geometry
2000
x728
50B
Choosing Symbol Pairs
strings
1500
x5552
50A
Domino piling
greedy
,
math
800
x230821
49E
Common ancestor
dp
2300
x650
49D
Game
brute force
,
dp
,
implementation
1800
x1837
49C
Disposition
constructive algorithms
,
math
1700
x1648
49B
Sum
math
1500
x2398
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