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Before contest
Educational Codeforces Round 169 (Rated for Div. 2)
10:12:33
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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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Status
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Custom test
Problems
#
Name
586B
Laurenty and Shop
implementation
1300
x5136
585B
Phillip and Trains
dfs and similar
,
graphs
,
shortest paths
1700
x3511
584C
Marina and Vasya
constructive algorithms
,
greedy
,
strings
1700
x6163
584B
Kolya and Tanya
combinatorics
1500
x11845
582A
GCD Table
constructive algorithms
,
greedy
,
number theory
1700
x7690
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3580
581C
Developing Skills
implementation
,
math
,
sortings
1400
x7287
580C
Kefa and Park
dfs and similar
,
graphs
,
trees
1500
x41778
580B
Kefa and Company
binary search
,
sortings
,
two pointers
1500
x25866
579B
Finding Team Member
brute force
,
implementation
,
sortings
1300
x5239
578B
"Or" Game
brute force
,
greedy
1700
x5190
578A
A Problem about Polyline
geometry
,
math
1700
x4750
576A
Vasya and Petya's Game
math
,
number theory
1500
x13628
575D
Tablecity
constructive algorithms
,
implementation
1700
x1819
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7725
573B
Bear and Blocks
binary search
,
data structures
,
dp
,
math
1600
x5761
573A
Bear and Poker
implementation
,
math
,
number theory
1300
x16442
572B
Order Book
data structures
,
greedy
,
implementation
,
sortings
1300
x6835
570C
Replacement
constructive algorithms
,
data structures
,
implementation
1600
x9095
570B
Simple Game
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1300
x16024
569A
Music
implementation
,
math
1500
x4782
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5029
567D
One-Dimensional Battle Ships
binary search
,
data structures
,
greedy
,
sortings
1700
x4739
567C
Geometric Progression
binary search
,
data structures
,
dp
1700
x9387
567B
Berland National Library
implementation
1300
x8383
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x3584
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10550
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10363
558B
Amr and The Large Array
implementation
1300
x7805
557B
Pasha and Tea
constructive algorithms
,
implementation
,
math
,
sortings
1500
x7163
555A
Case of Matryoshkas
implementation
1500
x6517
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8560
550C
Divisibility by Eight
brute force
,
dp
,
math
1500
x28051
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x20511
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x37355
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8379
546D
Soldier and Number Game
constructive algorithms
,
dp
,
math
,
number theory
1700
x11605
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x17362
545D
Queue
greedy
,
implementation
,
sortings
1300
x24679
545C
Woodcutters
dp
,
greedy
1500
x27321
544B
Sea and Islands
constructive algorithms
,
implementation
1400
x7928
540B
School Marks
greedy
,
implementation
1700
x4646
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5784
538B
Quasi Binary
constructive algorithms
,
dp
,
greedy
,
implementation
1400
x17854
538A
Cutting Banner
brute force
,
implementation
1400
x7098
534C
Polycarpus' Dice
math
1600
x4973
534B
Covered Path
dp
,
greedy
,
math
1400
x10089
533C
Board Game
games
,
greedy
,
implementation
,
math
1700
x2181
530E
Sum and product
*special problem
1700
x306
530D
Set subtraction
*special problem
1600
x452
530C
Diophantine equation
*special problem
1500
x551
530B
String inside out
*special problem
1600
x542
530A
Quadratic equation
*special problem
1500
x673
527C
Glass Carving
binary search
,
data structures
,
implementation
1500
x6823
527B
Error Correct System
greedy
1500
x3864
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4477
526A
King of Thieves
brute force
,
implementation
1300
x4745
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5774
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9302
524B
Фото на память - 2 (round version)
dp
,
greedy
1700
x1452
524A
Возможно, вы знаете этих людей?
implementation
1600
x1396
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2298
523C
Name Quest
*special problem
,
greedy
1400
x2482
523B
Mean Requests
*special problem
,
implementation
1500
x946
520C
DNA Alignment
math
,
strings
1500
x4124
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x49917
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19534
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x6906
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x5964
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x7914
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9181
515C
Drazil and Factorial
greedy
,
math
,
sortings
1400
x25593
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7411
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20577
513B1
Permutations
brute force
1400
x3608
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x15840
510B
Fox And Two Dots
dfs and similar
1500
x13765
509B
Painting Pebbles
constructive algorithms
,
greedy
,
implementation
1300
x9578
508C
Anya and Ghosts
constructive algorithms
,
greedy
1600
x4443
508B
Anton and currency you all know
greedy
,
math
,
strings
1300
x22440
507C
Guess Your Way Out!
implementation
,
math
,
trees
1700
x4311
507B
Amr and Pins
geometry
,
math
1400
x24320
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x12508
501C
Misha and Forest
constructive algorithms
,
data structures
,
greedy
,
sortings
,
trees
1500
x5608
500C
New Year Book Reading
constructive algorithms
,
greedy
,
implementation
,
math
1600
x5796
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8812
498A
Crazy Town
geometry
1700
x6418
496C
Removing Columns
brute force
,
constructive algorithms
,
implementation
1500
x7688
496B
Secret Combination
brute force
,
constructive algorithms
,
implementation
1500
x5847
495B
Modular Equations
math
,
number theory
1600
x6753
494A
Treasure
greedy
1500
x6174
493D
Vasya and Chess
constructive algorithms
,
games
,
math
1700
x9606
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6755
493B
Vasya and Wrestling
implementation
1400
x13174
493A
Vasya and Football
implementation
1300
x6072
492C
Vanya and Exams
greedy
,
sortings
1400
x13917
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x9024
490B
Queue
dsu
,
implementation
1500
x5958
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6647
489C
Given Length and Sum of Digits...
dp
,
greedy
,
implementation
1400
x45620
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