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Before contest
Educational Codeforces Round 169 (Rated for Div. 2)
14:07:27
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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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Custom test
Problems
#
Name
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x11651
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x17364
485B
Valuable Resources
brute force
,
greedy
1300
x6502
485A
Factory
implementation
,
math
,
matrices
1400
x8208
484A
Bits
bitmasks
,
constructive algorithms
1700
x11089
479D
Long Jumps
binary search
,
greedy
,
implementation
1700
x4762
479C
Exams
greedy
,
sortings
1400
x29215
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7833
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x36097
476C
Dreamoon and Sums
math
1600
x5667
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x30100
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8386
474D
Flowers
dp
1700
x24747
472C
Design Tutorial: Make It Nondeterministic
greedy
1400
x6346
472B
Design Tutorial: Learn from Life
1300
x7399
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3547
471B
MUH and Important Things
implementation
,
sortings
1300
x5926
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x673
469B
Chat Online
implementation
1300
x12530
468A
24 Game
constructive algorithms
,
greedy
,
math
1500
x7955
467C
George and Job
dp
,
implementation
1700
x14429
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x35513
464A
No to Palindromes!
greedy
,
strings
1700
x5848
462B
Appleman and Card Game
greedy
1300
x14292
460C
Present
binary search
,
data structures
,
greedy
1700
x6152
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12245
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x39699
457A
Golden System
math
,
meet-in-the-middle
1700
x1267
455A
Boredom
dp
1500
x56891
453A
Little Pony and Expected Maximum
probabilities
1600
x10296
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3317
451B
Sort the Array
implementation
,
sortings
1300
x44541
450B
Jzzhu and Sequences
implementation
,
math
1300
x25922
449A
Jzzhu and Chocolate
greedy
,
math
1700
x3882
448B
Suffix Structures
implementation
,
strings
1400
x15930
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12433
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12399
444A
DZY Loves Physics
greedy
,
math
1600
x3390
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4037
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2102
441C
Valera and Tubes
constructive algorithms
,
dfs and similar
,
implementation
1500
x11121
441B
Valera and Fruits
greedy
,
implementation
1400
x7031
440B
Balancer
greedy
,
implementation
1600
x1949
439D
Devu and his Brother
binary search
,
sortings
,
ternary search
,
two pointers
1700
x5985
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3832
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x13712
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9383
437A
The Child and Homework
implementation
1300
x8961
436B
Om Nom and Spiders
implementation
,
math
1400
x3047
436A
Feed with Candy
greedy
1500
x3448
435C
Cardiogram
implementation
1600
x2555
435B
Pasha Maximizes
greedy
1400
x6858
431C
k-Tree
dp
,
implementation
,
trees
1600
x25253
430B
Balls Game
brute force
,
two pointers
1400
x3672
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2233
429B
Working out
dp
1600
x8445
429A
Xor-tree
dfs and similar
,
trees
1300
x10182
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x13609
426B
Sereja and Mirroring
implementation
1300
x3786
425A
Sereja and Swaps
brute force
,
sortings
1500
x3871
424C
Magic Formulas
math
1600
x5290
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4643
417B
Crash
implementation
1400
x1765
417A
Elimination
dp
,
implementation
,
math
1500
x2949
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x7810
416B
Art Union
brute force
,
dp
,
implementation
1300
x8606
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8798
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6212
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x21773
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9738
413C
Jeopardy!
greedy
,
math
1400
x2341
413B
Spyke Chatting
implementation
1300
x1688
411C
Kicker
implementation
1700
x1220
411B
Multi-core Processor
implementation
1600
x1273
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8809
409D
Big Data
*special problem
1700
x1708
409C
Magnum Opus
*special problem
1700
x1966
409B
Mysterious Language
*special problem
1700
x1355
409A
The Great Game
*special problem
1700
x2454
407B
Long Path
dp
,
implementation
1600
x6476
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4836
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3105
405C
Unusual Product
implementation
,
math
1600
x4599
404B
Marathon
implementation
,
math
1500
x2908
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x5807
402B
Trees in a Row
brute force
,
implementation
1400
x3793
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x19755
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2882
388A
Fox and Box Accumulation
greedy
,
sortings
1400
x11444
387C
George and Number
greedy
,
implementation
1700
x2176
386B
Fly, freebies, fly!
binary search
,
brute force
,
implementation
1400
x2133
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9536
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3512
383A
Milking cows
data structures
,
greedy
1600
x5232
382C
Arithmetic Progression
implementation
,
sortings
1700
x8248
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2670
379C
New Year Ratings Change
greedy
,
sortings
1400
x6525
378B
Semifinals
implementation
,
sortings
1300
x5186
377A
Maze
dfs and similar
1600
x22028
376B
I.O.U.
implementation
1300
x6296
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