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Educational Codeforces Round 169 (Rated for Div. 2)
10:16:13
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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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Custom test
Problems
#
Name
678D
Iterated Linear Function
math
,
number theory
1700
x4464
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9324
678B
The Same Calendar
implementation
1600
x4095
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6347
677B
Vanya and Food Processor
implementation
,
math
1400
x7590
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18525
676B
Pyramid of Glasses
implementation
,
math
,
math
1500
x5482
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7353
673B
Problems for Round
greedy
,
implementation
1300
x3507
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3186
670D2
Magic Powder - 2
binary search
,
implementation
1500
x13824
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x17111
670C
Cinema
implementation
,
sortings
1300
x9047
665C
Simple Strings
dp
,
greedy
,
strings
1300
x9898
665B
Shopping
brute force
1400
x3514
665A
Buses Between Cities
implementation
1600
x2910
661A
Lazy Caterer Sequence
*special problem
1300
x633
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9255
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7412
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6280
659B
Qualifying Contest
constructive algorithms
,
sortings
1300
x6229
656B
Scrambled
*special problem
,
implementation
1700
x1648
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4935
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4599
650A
Watchmen
data structures
,
geometry
,
math
1400
x15337
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x349
649C
Печать условий
constructive algorithms
,
greedy
,
sortings
1500
x444
649B
Этажи
constructive algorithms
1400
x527
645C
Enduring Exodus
binary search
,
two pointers
1600
x3211
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2636
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3156
643A
Bear and Colors
implementation
1500
x4130
641B
Little Artem and Matrix
implementation
1400
x3975
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6474
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1956
637D
Running with Obstacles
*special problem
,
data structures
,
dp
,
greedy
1600
x1992
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2417
634A
Island Puzzle
constructive algorithms
,
implementation
1300
x3297
633B
A Trivial Problem
brute force
,
constructive algorithms
,
math
,
number theory
1300
x6634
632C
The Smallest String Concatenation
sortings
,
strings
1700
x7575
632B
Alice, Bob, Two Teams
brute force
,
constructive algorithms
1400
x3951
631C
Report
data structures
,
sortings
1700
x3770
630Q
Pyramids
geometry
,
math
1700
x1256
630N
Forecast
math
1300
x4621
630L
Cracking the Code
implementation
,
math
1400
x3543
630K
Indivisibility
math
,
number theory
1500
x5198
630I
Parking Lot
combinatorics
,
math
1700
x6580
630H
Benches
combinatorics
,
math
1400
x4903
630G
Challenge Pennants
combinatorics
,
math
1600
x2716
630F
Selection of Personnel
combinatorics
,
math
1300
x6752
628C
Bear and String Distance
greedy
,
strings
1300
x5787
628B
New Skateboard
dp
1300
x10543
627B
Factory Repairs
data structures
1700
x2890
627A
XOR Equation
dp
,
math
1700
x4180
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4319
626B
Cards
constructive algorithms
,
dp
,
math
1300
x6577
625C
K-special Tables
constructive algorithms
,
implementation
1300
x6793
625A
Guest From the Past
implementation
,
math
1700
x5377
622C
Not Equal on a Segment
data structures
,
implementation
1700
x6373
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5412
621B
Wet Shark and Bishops
combinatorics
,
implementation
1300
x10910
620C
Pearls in a Row
greedy
1500
x6623
618C
Constellation
geometry
,
implementation
1600
x4213
617D
Polyline
constructive algorithms
,
implementation
1700
x4185
617C
Watering Flowers
implementation
1600
x4835
617B
Chocolate
combinatorics
1300
x17685
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x9149
616C
The Labyrinth
dfs and similar
1600
x5507
615B
Longtail Hedgehog
dp
,
graphs
1600
x5013
614B
Gena's Code
implementation
,
math
1400
x6857
614A
Link/Cut Tree
brute force
,
implementation
1500
x7434
612C
Replace To Make Regular Bracket Sequence
data structures
,
expression parsing
,
math
1400
x7893
612A
The Text Splitting
brute force
,
implementation
,
strings
1300
x7134
611C
New Year and Domino
dp
,
implementation
1500
x8419
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x9987
610B
Vika and Squares
constructive algorithms
,
implementation
1300
x7172
609C
Load Balancing
implementation
,
math
1500
x6444
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6753
607A
Chain Reaction
binary search
,
dp
1600
x9479
606B
Testing Robots
implementation
1600
x2739
605B
Lazy Student
constructive algorithms
,
data structures
,
graphs
1700
x3417
605A
Sorting Railway Cars
constructive algorithms
,
greedy
1600
x7086
604B
More Cowbell
binary search
,
greedy
1400
x8373
603A
Alternative Thinking
dp
,
greedy
,
math
1600
x7607
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x10684
601A
The Two Routes
graphs
,
shortest paths
1600
x11708
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x28886
600A
Extract Numbers
implementation
,
strings
1600
x5159
599C
Day at the Beach
sortings
1600
x4610
599B
Spongebob and Joke
implementation
1500
x4354
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x10830
598B
Queries on a String
implementation
,
strings
1300
x10784
597B
Restaurant
dp
,
greedy
,
sortings
1600
x4755
597A
Divisibility
math
1600
x4466
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2242
595B
Pasha and Phone
binary search
,
math
1600
x2904
593B
Anton and Lines
geometry
,
sortings
1600
x3963
590A
Median Smoothing
implementation
1700
x3912
588B
Duff in Love
math
1300
x14005
587A
Duff and Weight Lifting
greedy
1500
x7458
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