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Please read
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Before contest
Codeforces Round 975 (Div. 1)
3 days
Before contest
Codeforces Round 975 (Div. 2)
3 days
→ Filter Problems
Difficulty:
—
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
Submit
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
x7198
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x7695
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9378
678B
The Same Calendar
implementation
1600
x4106
665A
Buses Between Cities
implementation
1600
x2925
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9322
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7446
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x355
645C
Enduring Exodus
binary search
,
two pointers
1600
x3246
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3166
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6497
637D
Running with Obstacles
*special problem
,
data structures
,
dp
,
greedy
1600
x2001
630G
Challenge Pennants
combinatorics
,
math
1600
x2728
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4331
618C
Constellation
geometry
,
implementation
1600
x4235
617C
Watering Flowers
implementation
1600
x4861
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x9342
616C
The Labyrinth
dfs and similar
1600
x5585
615B
Longtail Hedgehog
dp
,
graphs
1600
x5093
607A
Chain Reaction
binary search
,
dp
1600
x9528
606B
Testing Robots
implementation
1600
x2746
605A
Sorting Railway Cars
constructive algorithms
,
greedy
1600
x7112
603A
Alternative Thinking
dp
,
greedy
,
math
1600
x7631
601A
The Two Routes
graphs
,
shortest paths
1600
x11876
600A
Extract Numbers
implementation
,
strings
1600
x5203
599C
Day at the Beach
sortings
1600
x4624
597B
Restaurant
dp
,
greedy
,
sortings
1600
x4808
597A
Divisibility
math
1600
x4492
595B
Pasha and Phone
binary search
,
math
1600
x2912
593B
Anton and Lines
geometry
,
sortings
1600
x4022
573B
Bear and Blocks
binary search
,
data structures
,
dp
,
math
1600
x5834
570C
Replacement
constructive algorithms
,
data structures
,
implementation
1600
x9127
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5043
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10412
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5803
534C
Polycarpus' Dice
math
1600
x5003
530D
Set subtraction
*special problem
1600
x452
530B
String inside out
*special problem
1600
x542
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5799
524A
Возможно, вы знаете этих людей?
implementation
1600
x1402
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2327
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x5985
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9203
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x16144
508C
Anya and Ghosts
constructive algorithms
,
greedy
1600
x4459
500C
New Year Book Reading
constructive algorithms
,
greedy
,
implementation
,
math
1600
x5804
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8860
495B
Modular Equations
math
,
number theory
1600
x6893
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6786
476C
Dreamoon and Sums
math
1600
x5704
453A
Little Pony and Expected Maximum
probabilities
1600
x10402
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12516
444A
DZY Loves Physics
greedy
,
math
1600
x3405
440B
Balancer
greedy
,
implementation
1600
x1968
435C
Cardiogram
implementation
1600
x2568
431C
k-Tree
dp
,
implementation
,
trees
1600
x25482
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2237
429B
Working out
dp
1600
x8589
424C
Magic Formulas
math
1600
x5337
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x7871
411B
Multi-core Processor
implementation
1600
x1276
407B
Long Path
dp
,
implementation
1600
x6497
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4872
405C
Unusual Product
implementation
,
math
1600
x4620
383A
Milking cows
data structures
,
greedy
1600
x5252
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2678
377A
Maze
dfs and similar
1600
x22301
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x5048
375A
Divisible by Seven
math
,
number theory
1600
x4817
373B
Making Sequences is Fun
binary search
,
implementation
,
math
1600
x2473
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x12890
371C
Hamburgers
binary search
,
brute force
1600
x26043
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9938
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4665
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4820
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6536
348A
Mafia
binary search
,
math
,
sortings
1600
x12991
346A
Alice and Bob
games
,
math
,
number theory
1600
x8663
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x13753
343A
Rational Resistance
math
,
number theory
1600
x8717
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4221
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4882
333A
Secrets
greedy
1600
x4023
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x734
322B
Ciel and Flowers
combinatorics
,
math
1600
x11732
319A
Malek Dance Club
combinatorics
,
math
1600
x2789
317A
Perfect Pair
brute force
1600
x4639
316B2
EKG
dfs and similar
,
dp
1600
x1581
314A
Sereja and Contest
implementation
1600
x2071
305C
Ivan and Powers of Two
greedy
,
implementation
1600
x2442
305A
Strange Addition
brute force
,
constructive algorithms
,
implementation
1600
x4761
297B
Fish Weight
constructive algorithms
,
greedy
1600
x3475
291D
Parallel Programming
*special problem
,
greedy
1600
x1476
291C
Network Mask
*special problem
,
bitmasks
,
brute force
,
implementation
1600
x1677
283A
Cows and Sequence
constructive algorithms
,
data structures
,
implementation
1600
x6556
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2617
269A
Magical Boxes
greedy
,
math
1600
x3521
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3801
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