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Before contest
Codeforces Round 987 (Div. 2)
01:47:53
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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
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x13145
501C
Misha and Forest
constructive algorithms
,
data structures
,
greedy
,
sortings
,
trees
1500
x5662
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3127
500C
New Year Book Reading
constructive algorithms
,
greedy
,
implementation
,
math
1600
x5827
500B
New Year Permutation
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
1600
x8903
498A
Crazy Town
geometry
1700
x6475
496D
Tennis Game
binary search
1900
x3024
496C
Removing Columns
brute force
,
constructive algorithms
,
implementation
1500
x7754
496B
Secret Combination
brute force
,
constructive algorithms
,
implementation
1500
x5929
495B
Modular Equations
math
,
number theory
1600
x7007
494A
Treasure
greedy
1500
x6257
493D
Vasya and Chess
constructive algorithms
,
games
,
math
1700
x9712
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6836
493B
Vasya and Wrestling
implementation
1400
x13373
493A
Vasya and Football
implementation
1300
x6125
492D
Vanya and Computer Game
binary search
,
implementation
,
math
,
sortings
1800
x3159
492C
Vanya and Exams
greedy
,
sortings
1400
x14140
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2144
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x9102
490B
Queue
dsu
,
implementation
1500
x6016
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6705
489C
Given Length and Sum of Digits...
dp
,
greedy
,
implementation
1400
x46530
488B
Candy Boxes
brute force
,
constructive algorithms
,
math
1900
x2126
487A
Fight the Monster
binary search
,
brute force
,
implementation
1800
x3770
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x11769
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x17831
485B
Valuable Resources
brute force
,
greedy
1300
x6539
485A
Factory
implementation
,
math
,
matrices
1400
x8304
484A
Bits
bitmasks
,
constructive algorithms
1700
x11465
483B
Friends and Presents
binary search
,
math
1800
x4090
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6568
479E
Riding in a Lift
combinatorics
,
dp
1900
x5166
479D
Long Jumps
binary search
,
greedy
,
implementation
1700
x4794
479C
Exams
greedy
,
sortings
1400
x29839
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7925
478C
Table Decorations
greedy
1800
x18356
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x36837
476D
Dreamoon and Sets
constructive algorithms
,
greedy
,
math
1900
x4685
476C
Dreamoon and Sums
math
1600
x5750
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x31065
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8525
474D
Flowers
dp
1700
x25522
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x5442
472C
Design Tutorial: Make It Nondeterministic
greedy
1400
x6366
472B
Design Tutorial: Learn from Life
1300
x7424
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x8243
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3569
471B
MUH and Important Things
implementation
,
sortings
1300
x5958
470E
Chessboard
*special problem
1900
x198
470D
Caesar Cipher
*special problem
1900
x153
470C
Eval
*special problem
1900
x255
470B
Hexakosioihexekontahexaphobia
*special problem
1800
x260
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x677
469B
Chat Online
implementation
1300
x12698
468A
24 Game
constructive algorithms
,
greedy
,
math
1500
x8005
467C
George and Job
dp
,
implementation
1700
x14766
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x36474
464A
No to Palindromes!
greedy
,
strings
1700
x5919
463D
Gargari and Permutations
dfs and similar
,
dp
,
graphs
,
implementation
1900
x6556
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8762
462B
Appleman and Card Game
greedy
1300
x14515
460C
Present
binary search
,
data structures
,
greedy
1700
x6245
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12417
459E
Pashmak and Graph
dp
,
sortings
1900
x5538
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x10244
459C
Pashmak and Buses
combinatorics
,
constructive algorithms
,
math
1900
x6191
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x40673
457B
Distributed Join
greedy
1900
x1135
457A
Golden System
math
,
meet-in-the-middle
1700
x1284
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x6012
455A
Boredom
dp
1500
x59269
453A
Little Pony and Expected Maximum
probabilities
1600
x10649
452D
Washer, Dryer, Folder
greedy
,
implementation
1900
x1522
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x2001
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3387
451B
Sort the Array
implementation
,
sortings
1300
x45792
450B
Jzzhu and Sequences
implementation
,
math
1300
x26458
449A
Jzzhu and Chocolate
greedy
,
math
1700
x3951
448D
Multiplication Table
binary search
,
brute force
1800
x14222
448C
Painting Fence
divide and conquer
,
dp
,
greedy
1900
x8279
448B
Suffix Structures
implementation
,
strings
1400
x16164
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12594
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12779
444A
DZY Loves Physics
greedy
,
math
1600
x3426
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4067
442B
Andrey and Problem
greedy
,
math
,
probabilities
1800
x5275
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2152
441C
Valera and Tubes
constructive algorithms
,
dfs and similar
,
implementation
1500
x11240
441B
Valera and Fruits
greedy
,
implementation
1400
x7102
440C
One-Based Arithmetic
brute force
,
dfs and similar
,
divide and conquer
1800
x921
440B
Balancer
greedy
,
implementation
1600
x1990
439D
Devu and his Brother
binary search
,
sortings
,
ternary search
,
two pointers
1700
x6126
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3929
437D
The Child and Zoo
dsu
,
sortings
1900
x3391
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x13995
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9552
437A
The Child and Homework
implementation
1300
x9046
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2679
436B
Om Nom and Spiders
implementation
,
math
1400
x3056
436A
Feed with Candy
greedy
1500
x3481
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