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Educational Codeforces Round 167 (Rated for Div. 2)
21:21:09
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combine-tags-by-or
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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
456B
Fedya and Maths
math
,
number theory
1200
x16211
454B
Little Pony and Sort by Shift
implementation
1200
x17943
445A
DZY Loves Chessboard
dfs and similar
,
implementation
1200
x28634
439B
Devu, the Dumb Guy
implementation
,
sortings
1200
x14117
433B
Kuriyama Mirai's Stones
dp
,
implementation
,
sortings
1200
x37188
432B
Football Kit
brute force
,
greedy
,
implementation
1200
x11549
431B
Shower Line
brute force
,
implementation
1200
x10577
424B
Megacity
binary search
,
greedy
,
implementation
,
sortings
1200
x7393
413A
Data Recovery
implementation
1200
x2554
412C
Pattern
implementation
,
strings
1200
x3870
408B
Garland
implementation
1200
x9006
401B
Sereja and Contests
greedy
,
implementation
,
math
1200
x4402
400B
Inna and New Matrix of Candies
brute force
,
implementation
,
schedules
1200
x7425
387B
George and Round
brute force
,
greedy
,
two pointers
1200
x11983
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x9610
379B
New Year Present
constructive algorithms
,
implementation
1200
x7208
366B
Dima and To-do List
brute force
,
implementation
1200
x6759
361B
Levko and Permutation
constructive algorithms
,
math
,
number theory
1200
x7927
353A
Domino
implementation
,
math
1200
x18032
350A
TL
brute force
,
greedy
,
implementation
1200
x16092
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8733
342A
Xenia and Divisors
greedy
,
implementation
1200
x12239
340A
The Wall
math
1200
x7472
327B
Hungry Sequence
math
1200
x19201
327A
Flipping Game
brute force
,
dp
,
implementation
1200
x40563
315B
Sereja and Array
implementation
1200
x6896
304A
Pythagorean Theorem II
brute force
,
math
1200
x10256
302B
Eugeny and Play List
binary search
,
implementation
,
two pointers
1200
x7873
298B
Sail
brute force
,
greedy
,
implementation
1200
x13719
292B
Network Topology
graphs
,
implementation
1200
x7875
285C
Building Permutation
greedy
,
implementation
,
sortings
1200
x22709
285B
Find Marble
implementation
1200
x14832
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10660
262B
Roma and Changing Signs
greedy
1200
x11035
255B
Code Parsing
implementation
1200
x4893
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x6900
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x18348
234A
Lefthanders and Righthanders
implementation
1200
x4393
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10472
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20626
216A
Tiling with Hexagons
implementation
,
math
1200
x4942
208D
Prizes, Prizes, more Prizes
implementation
1200
x7511
203A
Two Problems
brute force
,
implementation
1200
x4121
194B
Square
math
1200
x3451
186B
Growing Mushrooms
greedy
,
sortings
1200
x5375
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2472
177D1
Encrypting Messages
brute force
1200
x2086
177B2
Rectangular Game
number theory
1200
x2852
176A
Trading Business
greedy
,
sortings
1200
x1423
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2695
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4386
151B
Phone Numbers
implementation
,
strings
1200
x6260
145A
Lucky Conversion
greedy
,
implementation
1200
x6993
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4937
134A
Average Numbers
brute force
,
implementation
1200
x3828
133B
Unary
implementation
1200
x8697
131B
Opposites Attract
implementation
,
math
1200
x6898
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11826
112B
Petya and Square
implementation
,
math
1200
x4089
102A
Clothes
brute force
1200
x2943
101A
Homework
greedy
1200
x3734
88A
Chord
brute force
,
implementation
1200
x3761
80B
Depression
geometry
,
math
1200
x4249
79A
Bus Game
greedy
1200
x3992
78B
Easter Eggs
constructive algorithms
,
implementation
1200
x12915
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x909
69B
Bets
greedy
,
implementation
1200
x3211
63B
Settlers' Training
implementation
1200
x4740
59B
Fortune Telling
implementation
,
number theory
1200
x6752
55A
Flea travel
implementation
,
math
1200
x3354
53C
Little Frog
constructive algorithms
1200
x6319
48B
Land Lot
brute force
,
implementation
1200
x2628
47B
Coins
implementation
1200
x13274
38B
Chess
brute force
,
implementation
,
math
1200
x3437
33A
What is for dinner?
greedy
,
implementation
1200
x3909
31A
Worms Evolution
implementation
1200
x10040
27A
Next Test
implementation
,
sortings
1200
x19572
23A
You're Given a String...
brute force
,
greedy
1200
x5127
18C
Stripe
data structures
,
implementation
1200
x12660
15A
Cottage Village
implementation
,
sortings
1200
x3800
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x12653
9B
Running Student
brute force
,
geometry
,
implementation
1200
x5371
8A
Train and Peter
strings
1200
x5694
6C
Alice, Bob and Chocolate
greedy
,
two pointers
1200
x13330
5B
Center Alignment
implementation
,
strings
1200
x5726
4B
Before an Exam
constructive algorithms
,
greedy
1200
x24049
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