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Codeforces Round (Div. 2)
29:10:26
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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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Status
Standings
Custom test
Problems
#
Name
683C
Symmetric Difference
*special problem
1600
x315
683B
The Teacher of Physical Education
*special problem
1600
x317
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x7076
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x7447
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12589
678D
Iterated Linear Function
math
,
number theory
1700
x4442
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9285
678B
The Same Calendar
implementation
1600
x4066
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6336
677B
Vanya and Food Processor
implementation
,
math
1400
x7579
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18440
676B
Pyramid of Glasses
implementation
,
math
,
math
1500
x5473
675D
Tree Construction
data structures
,
trees
1800
x3730
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7342
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4171
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3176
670D2
Magic Powder - 2
binary search
,
implementation
1500
x13661
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x16856
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3434
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3329
665B
Shopping
brute force
1400
x3508
665A
Buses Between Cities
implementation
1600
x2900
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3276
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9222
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7388
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6237
656B
Scrambled
*special problem
,
implementation
1700
x1645
652D
Nested Segments
data structures
,
sortings
1800
x3891
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3147
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4591
650A
Watchmen
data structures
,
geometry
,
math
1400
x15265
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x346
649C
Печать условий
constructive algorithms
,
greedy
,
sortings
1500
x442
649B
Этажи
constructive algorithms
1400
x527
645D
Robot Rapping Results Report
binary search
,
dp
,
graphs
1800
x2816
645C
Enduring Exodus
binary search
,
two pointers
1600
x3191
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2629
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3152
643A
Bear and Colors
implementation
1500
x4121
641C
Little Artem and Dance
brute force
,
constructive algorithms
,
implementation
1800
x2895
641B
Little Artem and Matrix
implementation
1400
x3838
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6455
638D
Three-dimensional Turtle Super Computer
brute force
,
dfs and similar
,
graphs
1800
x703
638C
Road Improvement
*special problem
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x1546
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1952
637D
Running with Obstacles
*special problem
,
data structures
,
dp
,
greedy
1600
x1980
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2413
632C
The Smallest String Concatenation
sortings
,
strings
1700
x7499
632B
Alice, Bob, Two Teams
brute force
,
constructive algorithms
1400
x3941
631C
Report
data structures
,
sortings
1700
x3763
630Q
Pyramids
geometry
,
math
1700
x1251
630M
Turn
geometry
,
math
1800
x1135
630L
Cracking the Code
implementation
,
math
1400
x3525
630K
Indivisibility
math
,
number theory
1500
x5174
630I
Parking Lot
combinatorics
,
math
1700
x6507
630H
Benches
combinatorics
,
math
1400
x4882
630G
Challenge Pennants
combinatorics
,
math
1600
x2698
627B
Factory Repairs
data structures
1700
x2737
627A
XOR Equation
dp
,
math
1700
x4045
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2694
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4316
625A
Guest From the Past
implementation
,
math
1700
x5371
623A
Graph and String
constructive algorithms
,
graphs
1800
x4418
622C
Not Equal on a Segment
data structures
,
implementation
1700
x6343
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5384
620C
Pearls in a Row
greedy
1500
x6582
618C
Constellation
geometry
,
implementation
1600
x4204
617D
Polyline
constructive algorithms
,
implementation
1700
x4178
617C
Watering Flowers
implementation
1600
x4825
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x9045
616C
The Labyrinth
dfs and similar
1600
x5472
615B
Longtail Hedgehog
dp
,
graphs
1600
x5002
614B
Gena's Code
implementation
,
math
1400
x6833
614A
Link/Cut Tree
brute force
,
implementation
1500
x7425
612D
The Union of k-Segments
greedy
,
sortings
1800
x3752
612C
Replace To Make Regular Bracket Sequence
data structures
,
expression parsing
,
math
1400
x7846
611C
New Year and Domino
dp
,
implementation
1500
x8402
610C
Harmony Analysis
constructive algorithms
1800
x2811
609C
Load Balancing
implementation
,
math
1500
x6413
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6712
607A
Chain Reaction
binary search
,
dp
1600
x9439
606B
Testing Robots
implementation
1600
x2737
605B
Lazy Student
constructive algorithms
,
data structures
,
graphs
1700
x3407
605A
Sorting Railway Cars
constructive algorithms
,
greedy
1600
x7068
604B
More Cowbell
binary search
,
greedy
1400
x8347
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2551
603A
Alternative Thinking
dp
,
greedy
,
math
1600
x7598
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x10625
601A
The Two Routes
graphs
,
shortest paths
1600
x11641
600C
Make Palindrome
constructive algorithms
,
greedy
,
strings
1800
x5960
600A
Extract Numbers
implementation
,
strings
1600
x5127
599C
Day at the Beach
sortings
1600
x4608
599B
Spongebob and Joke
implementation
1500
x4352
598D
Igor In the Museum
dfs and similar
,
graphs
,
shortest paths
1700
x10769
597B
Restaurant
dp
,
greedy
,
sortings
1600
x4722
597A
Divisibility
math
1600
x4449
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2242
595B
Pasha and Phone
binary search
,
math
1600
x2902
593B
Anton and Lines
geometry
,
sortings
1600
x3962
592C
The Big Race
math
1800
x3052
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