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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
11:58:52
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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
Standings
Custom test
Problems
#
Name
489C
Given Length and Sum of Digits...
dp
,
greedy
,
implementation
1400
x45422
487A
Fight the Monster
binary search
,
brute force
,
implementation
1800
x3700
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x11613
485A
Factory
implementation
,
math
,
matrices
1400
x8163
484A
Bits
bitmasks
,
constructive algorithms
1700
x11009
483B
Friends and Presents
binary search
,
math
1800
x4020
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6310
479D
Long Jumps
binary search
,
greedy
,
implementation
1700
x4738
479C
Exams
greedy
,
sortings
1400
x29114
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7809
478C
Table Decorations
greedy
1800
x17817
476C
Dreamoon and Sums
math
1600
x5492
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8371
474D
Flowers
dp
1700
x24596
472C
Design Tutorial: Make It Nondeterministic
greedy
1400
x6343
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x7759
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3545
470B
Hexakosioihexekontahexaphobia
*special problem
1800
x258
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x670
468A
24 Game
constructive algorithms
,
greedy
,
math
1500
x7945
467C
George and Job
dp
,
implementation
1700
x14365
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x35336
464A
No to Palindromes!
greedy
,
strings
1700
x5841
460C
Present
binary search
,
data structures
,
greedy
1700
x6130
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12224
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x9832
457A
Golden System
math
,
meet-in-the-middle
1700
x1267
455A
Boredom
dp
1500
x56238
453A
Little Pony and Expected Maximum
probabilities
1600
x10219
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1988
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3315
449A
Jzzhu and Chocolate
greedy
,
math
1700
x3881
448D
Multiplication Table
binary search
,
brute force
1800
x13648
448B
Suffix Structures
implementation
,
strings
1400
x15895
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12400
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12359
444A
DZY Loves Physics
greedy
,
math
1600
x3387
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4016
442B
Andrey and Problem
greedy
,
math
,
probabilities
1800
x5194
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2100
441C
Valera and Tubes
constructive algorithms
,
dfs and similar
,
implementation
1500
x11090
441B
Valera and Fruits
greedy
,
implementation
1400
x6999
440C
One-Based Arithmetic
brute force
,
dfs and similar
,
divide and conquer
1800
x899
440B
Balancer
greedy
,
implementation
1600
x1933
439D
Devu and his Brother
binary search
,
sortings
,
ternary search
,
two pointers
1700
x5949
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3821
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x13663
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9328
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2604
436B
Om Nom and Spiders
implementation
,
math
1400
x3046
436A
Feed with Candy
greedy
1500
x3437
435C
Cardiogram
implementation
1600
x2554
435B
Pasha Maximizes
greedy
1400
x6839
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2419
432C
Prime Swaps
greedy
,
sortings
1800
x2452
431C
k-Tree
dp
,
implementation
,
trees
1600
x25136
430B
Balls Game
brute force
,
two pointers
1400
x3663
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2231
429B
Working out
dp
1600
x8421
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x13530
425A
Sereja and Swaps
brute force
,
sortings
1500
x3833
424C
Magic Formulas
math
1600
x5271
420B
Online Meeting
implementation
1800
x1012
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4638
417B
Crash
implementation
1400
x1765
417A
Elimination
dp
,
implementation
,
math
1500
x2938
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x7759
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8779
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6190
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x21546
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9727
413C
Jeopardy!
greedy
,
math
1400
x2331
411C
Kicker
implementation
1700
x1220
411B
Multi-core Processor
implementation
1600
x1272
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8782
409E
Dome
*special problem
1800
x565
409D
Big Data
*special problem
1700
x1703
409C
Magnum Opus
*special problem
1700
x1961
409B
Mysterious Language
*special problem
1700
x1350
409A
The Great Game
*special problem
1700
x2449
407B
Long Path
dp
,
implementation
1600
x6465
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4787
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3102
405C
Unusual Product
implementation
,
math
1600
x4595
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x5108
404B
Marathon
implementation
,
math
1500
x2906
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2552
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x5784
402B
Trees in a Row
brute force
,
implementation
1400
x3782
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x19684
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2879
388A
Fox and Box Accumulation
greedy
,
sortings
1400
x11427
387C
George and Number
greedy
,
implementation
1700
x2174
386B
Fly, freebies, fly!
binary search
,
brute force
,
implementation
1400
x2131
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9514
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3509
383A
Milking cows
data structures
,
greedy
1600
x5227
382C
Arithmetic Progression
implementation
,
sortings
1700
x8230
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2665
379C
New Year Ratings Change
greedy
,
sortings
1400
x6518
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