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Educational Codeforces Round 166 (Rated for Div. 2)
27:07:57
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Difficulty:
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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
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Problems
#
Name
49A
Sleuth
implementation
800
x12966
48H
Black and White
constructive algorithms
2800
x134
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x255
48F
Snow sellers
greedy
,
sortings
2800
x135
48E
Ivan the Fool VS Gorynych the Dragon
dp
,
games
,
graphs
2100
x565
48D
Permutations
greedy
1500
x2417
48C
The Race
math
1800
x759
48B
Land Lot
brute force
,
implementation
1200
x2612
48A
Rock-paper-scissors
implementation
,
schedules
900
x5681
47E
Cannon
data structures
,
geometry
,
sortings
2200
x356
47D
Safe
brute force
2200
x750
47C
Crossword
implementation
2000
x751
47B
Coins
implementation
1200
x13138
47A
Triangular numbers
brute force
,
math
800
x14397
46G
Emperor's Problem
geometry
2500
x109
46F
Hercule Poirot Problem
dsu
,
graphs
2300
x311
46E
Comb
data structures
,
dp
1900
x926
46D
Parking Lot
data structures
,
implementation
1800
x960
46C
Hamsters and Tigers
two pointers
1600
x2259
46B
T-shirts from Sponsor
implementation
1100
x3544
46A
Ball Game
brute force
,
implementation
800
x8410
45J
Planting Trees
constructive algorithms
1800
x914
45I
TCMCF+++
greedy
1400
x2317
45H
Road Problem
graphs
2100
x177
45G
Prime Problem
number theory
2200
x997
45F
Goats and Wolves
greedy
2500
x125
45E
Director
constructive algorithms
,
greedy
2000
x526
45D
Event Dates
greedy
,
meet-in-the-middle
,
sortings
1900
x1607
45C
Dancing Lessons
data structures
1900
x860
45B
School
dp
,
dsu
2200
x269
45A
Codecraft III
implementation
900
x6390
44J
Triminoes
constructive algorithms
,
greedy
2000
x556
44I
Toys
brute force
,
combinatorics
2300
x184
44H
Phone Number
dp
1700
x1683
44G
Shooting Gallery
data structures
,
implementation
2500
x368
44F
BerPaint
geometry
,
graphs
2700
x64
44E
Anfisa the Monkey
dp
1400
x4854
44D
Hyperdrive
math
1800
x693
44C
Holidays
implementation
1300
x3220
44B
Cola
implementation
1500
x1907
44A
Indian Summer
implementation
900
x9568
43E
Race
brute force
,
implementation
,
two pointers
2300
x377
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1051
43C
Lucky Tickets
greedy
1300
x4159
43B
Letter
implementation
,
strings
1100
x15812
43A
Football
strings
1000
x52631
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x190
42D
Strange town
constructive algorithms
,
math
2300
x389
42C
Safe cracking
brute force
,
constructive algorithms
2200
x452
42B
Game of chess unfinished
implementation
1700
x924
42A
Guilty --- to the kitchen!
greedy
,
implementation
1400
x2765
41E
3-cycles
constructive algorithms
,
graphs
,
greedy
1900
x1906
41D
Pawn
dp
1900
x2196
41C
Email address
expression parsing
,
implementation
1300
x3653
41B
Martian Dollar
brute force
1400
x3887
41A
Translation
implementation
,
strings
800
x136228
40E
Number Table
combinatorics
2500
x656
40D
Interesting Sequence
math
2600
x126
40C
Berland Square
implementation
,
math
2300
x243
40B
Repaintings
math
1600
x1118
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3872
39K
Testing
2600
x82
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2832
39I
Tram
2500
x123
39H
Multiplication Table
implementation
1300
x2618
39G
Inverse Function
implementation
2400
x124
39F
Pacifist frogs
implementation
1300
x1500
39E
What Has Dirichlet Got to Do with That?
dp
,
games
2000
x855
39D
Cubical Planet
math
1100
x3768
39C
Moon Craters
dp
,
sortings
2100
x570
39B
Company Income Growth
greedy
1300
x2571
39A
C*++ Calculations
expression parsing
,
greedy
2000
x658
38H
The Great Marathon
dp
2400
x265
38G
Queue
data structures
2300
x682
38F
Smart Boy
dp
,
games
,
strings
2100
x379
38E
Let's Go Rolling!
dp
,
sortings
1800
x2505
38D
Vasya the Architect
implementation
1900
x479
38C
Blinds
brute force
1400
x2092
38B
Chess
brute force
,
implementation
,
math
1200
x3418
38A
Army
implementation
800
x20606
37E
Trial for Chief
graphs
,
greedy
,
shortest paths
2600
x588
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x390
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1544
37B
Computer Game
greedy
,
implementation
1800
x870
37A
Towers
sortings
1000
x23685
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x499
36D
New Game with a Chess Piece
games
2300
x678
36C
Bowls
geometry
,
implementation
2200
x329
36B
Fractal
implementation
1600
x1431
36A
Extra-terrestrial Intelligence
implementation
1300
x2905
35E
Parade
data structures
,
sortings
2100
x704
35D
Animals
dp
,
greedy
1700
x3167
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6369
35B
Warehouse
implementation
1700
x993
35A
Shell Game
implementation
1000
x6635
34E
Collisions
brute force
,
implementation
,
math
2000
x564
34D
Road Map
dfs and similar
,
graphs
1600
x4874
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4082
34B
Sale
greedy
,
sortings
900
x49148
34A
Reconnaissance 2
implementation
800
x28633
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