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Before contest
Codeforces Round 997 (Div. 2)
44:41:05
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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
567D
One-Dimensional Battle Ships
binary search
,
data structures
,
greedy
,
sortings
1700
x4862
567C
Geometric Progression
binary search
,
data structures
,
dp
1700
x9664
567B
Berland National Library
implementation
1300
x8486
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x3729
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10764
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10504
558B
Amr and The Large Array
implementation
1300
x7907
557B
Pasha and Tea
constructive algorithms
,
implementation
,
math
,
sortings
1500
x7222
555A
Case of Matryoshkas
implementation
1500
x6561
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8793
550C
Divisibility by Eight
brute force
,
dp
,
math
1500
x29263
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x22116
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x38826
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8526
546D
Soldier and Number Game
constructive algorithms
,
dp
,
math
,
number theory
1700
x12138
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x17853
545D
Queue
greedy
,
implementation
,
sortings
1300
x25624
545C
Woodcutters
dp
,
greedy
1500
x28708
544B
Sea and Islands
constructive algorithms
,
implementation
1400
x8111
540B
School Marks
greedy
,
implementation
1700
x4726
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5867
538B
Quasi Binary
constructive algorithms
,
dp
,
greedy
,
implementation
1400
x18263
538A
Cutting Banner
brute force
,
implementation
1400
x7159
534C
Polycarpus' Dice
math
1600
x5055
534B
Covered Path
dp
,
greedy
,
math
1400
x10426
533C
Board Game
games
,
greedy
,
implementation
,
math
1700
x2220
530E
Sum and product
*special problem
1700
x309
530D
Set subtraction
*special problem
1600
x454
530C
Diophantine equation
*special problem
1500
x558
530B
String inside out
*special problem
1600
x544
530A
Quadratic equation
*special problem
1500
x679
527C
Glass Carving
binary search
,
data structures
,
implementation
1500
x7012
527B
Error Correct System
greedy
1500
x3899
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4518
526A
King of Thieves
brute force
,
implementation
1300
x4800
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5841
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9499
524B
Фото на память - 2 (round version)
dp
,
greedy
1700
x1469
524A
Возможно, вы знаете этих людей?
implementation
1600
x1418
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2361
523C
Name Quest
*special problem
,
greedy
1400
x2510
523B
Mean Requests
*special problem
,
implementation
1500
x953
520C
DNA Alignment
math
,
strings
1500
x4182
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x52527
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19905
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x7121
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x6073
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x8032
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9259
515C
Drazil and Factorial
greedy
,
math
,
sortings
1400
x26408
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7493
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x21089
513B1
Permutations
brute force
1400
x3727
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x16846
510B
Fox And Two Dots
dfs and similar
1500
x14232
509B
Painting Pebbles
constructive algorithms
,
greedy
,
implementation
1300
x9693
508C
Anya and Ghosts
constructive algorithms
,
greedy
1600
x4496
508B
Anton and currency you all know
greedy
,
math
,
strings
1300
x22867
507C
Guess Your Way Out!
implementation
,
math
,
trees
1700
x4393
507B
Amr and Pins
geometry
,
math
1400
x25032
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x13332
501C
Misha and Forest
constructive algorithms
,
data structures
,
greedy
,
sortings
,
trees
1500
x5688
500C
New Year Book Reading
constructive algorithms
,
greedy
,
implementation
,
math
1600
x5844
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8962
498A
Crazy Town
geometry
1700
x6514
496C
Removing Columns
brute force
,
constructive algorithms
,
implementation
1500
x7796
496B
Secret Combination
brute force
,
constructive algorithms
,
implementation
1500
x5963
495B
Modular Equations
math
,
number theory
1600
x7166
494A
Treasure
greedy
1500
x6284
493D
Vasya and Chess
constructive algorithms
,
games
,
math
1700
x9763
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6872
493B
Vasya and Wrestling
implementation
1400
x13444
493A
Vasya and Football
implementation
1300
x6144
492C
Vanya and Exams
greedy
,
sortings
1400
x14301
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x9142
490B
Queue
dsu
,
implementation
1500
x6084
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6732
489C
Given Length and Sum of Digits...
dp
,
greedy
,
implementation
1400
x47092
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x11830
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x18001
485B
Valuable Resources
brute force
,
greedy
1300
x6553
485A
Factory
implementation
,
math
,
matrices
1400
x8377
484A
Bits
bitmasks
,
constructive algorithms
1700
x11644
479D
Long Jumps
binary search
,
greedy
,
implementation
1700
x4853
479C
Exams
greedy
,
sortings
1400
x30195
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7963
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x37303
476C
Dreamoon and Sums
math
1600
x5767
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x31658
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8619
474D
Flowers
dp
1700
x26179
472C
Design Tutorial: Make It Nondeterministic
greedy
1400
x6379
472B
Design Tutorial: Learn from Life
1300
x7463
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3588
471B
MUH and Important Things
implementation
,
sortings
1300
x5973
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x680
469B
Chat Online
implementation
1300
x12781
468A
24 Game
constructive algorithms
,
greedy
,
math
1500
x8041
467C
George and Job
dp
,
implementation
1700
x14919
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x37009
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