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Before contest
Codeforces Round 994 (Div. 2)
19:22:08
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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
723C
Polycarp at the Radio
greedy
1600
x4730
722C
Destroying Array
data structures
,
dsu
1600
x9591
715A
Plus and Square Root
constructive algorithms
,
math
1600
x5636
712C
Memory and De-Evolution
greedy
,
math
1600
x5883
706C
Hard problem
dp
,
strings
1600
x16605
704A
Thor
brute force
,
data structures
,
implementation
1600
x9390
691B
s-palindrome
implementation
,
strings
1600
x7467
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x6061
683C
Symmetric Difference
*special problem
1600
x326
683B
The Teacher of Physical Education
*special problem
1600
x321
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x7312
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x7926
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9625
678B
The Same Calendar
implementation
1600
x4159
665A
Buses Between Cities
implementation
1600
x2969
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9601
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7510
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x371
645C
Enduring Exodus
binary search
,
two pointers
1600
x3356
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3202
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6549
637D
Running with Obstacles
*special problem
,
data structures
,
dp
,
greedy
1600
x2037
630G
Challenge Pennants
combinatorics
,
math
1600
x2850
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4365
618C
Constellation
geometry
,
implementation
1600
x4340
617C
Watering Flowers
implementation
1600
x4908
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x9839
616C
The Labyrinth
dfs and similar
1600
x5846
615B
Longtail Hedgehog
dp
,
graphs
1600
x5169
607A
Chain Reaction
binary search
,
dp
1600
x9699
606B
Testing Robots
implementation
1600
x2772
605A
Sorting Railway Cars
constructive algorithms
,
greedy
1600
x7183
603A
Alternative Thinking
dp
,
greedy
,
math
1600
x7710
601A
The Two Routes
graphs
,
shortest paths
1600
x12201
600A
Extract Numbers
implementation
,
strings
1600
x5353
599C
Day at the Beach
sortings
1600
x4672
597B
Restaurant
dp
,
greedy
,
sortings
1600
x4920
597A
Divisibility
math
1600
x4560
595B
Pasha and Phone
binary search
,
math
1600
x2929
593B
Anton and Lines
geometry
,
sortings
1600
x4064
573B
Bear and Blocks
binary search
,
data structures
,
dp
,
math
1600
x5978
570C
Replacement
constructive algorithms
,
data structures
,
implementation
1600
x9224
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5132
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10489
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5849
534C
Polycarpus' Dice
math
1600
x5044
530D
Set subtraction
*special problem
1600
x452
530B
String inside out
*special problem
1600
x542
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5833
524A
Возможно, вы знаете этих людей?
implementation
1600
x1416
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2356
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x6055
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9251
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x16695
508C
Anya and Ghosts
constructive algorithms
,
greedy
1600
x4481
500C
New Year Book Reading
constructive algorithms
,
greedy
,
implementation
,
math
1600
x5834
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8931
495B
Modular Equations
math
,
number theory
1600
x7063
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6852
476C
Dreamoon and Sums
math
1600
x5760
453A
Little Pony and Expected Maximum
probabilities
1600
x10765
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12643
444A
DZY Loves Physics
greedy
,
math
1600
x3437
440B
Balancer
greedy
,
implementation
1600
x2002
435C
Cardiogram
implementation
1600
x2585
431C
k-Tree
dp
,
implementation
,
trees
1600
x26056
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2288
429B
Working out
dp
1600
x8884
424C
Magic Formulas
math
1600
x5475
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x8087
411B
Multi-core Processor
implementation
1600
x1284
407B
Long Path
dp
,
implementation
1600
x6619
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4922
405C
Unusual Product
implementation
,
math
1600
x4698
383A
Milking cows
data structures
,
greedy
1600
x5315
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2701
377A
Maze
dfs and similar
1600
x22917
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x5087
375A
Divisible by Seven
math
,
number theory
1600
x4875
373B
Making Sequences is Fun
binary search
,
implementation
,
math
1600
x2491
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x13242
371C
Hamburgers
binary search
,
brute force
1600
x27137
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x10226
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4731
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4939
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6571
348A
Mafia
binary search
,
math
,
sortings
1600
x13314
346A
Alice and Bob
games
,
math
,
number theory
1600
x8749
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x14126
343A
Rational Resistance
math
,
number theory
1600
x8796
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4252
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4956
333A
Secrets
greedy
1600
x4057
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x761
322B
Ciel and Flowers
combinatorics
,
math
1600
x11905
319A
Malek Dance Club
combinatorics
,
math
1600
x2837
317A
Perfect Pair
brute force
1600
x4678
316B2
EKG
dfs and similar
,
dp
1600
x1596
314A
Sereja and Contest
implementation
1600
x2082
305C
Ivan and Powers of Two
greedy
,
implementation
1600
x2464
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