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Codeforces Round (Div. 2)
33:13:34
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→ Filter Problems
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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Problems
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Status
Standings
Custom test
Problems
#
Name
489C
Given Length and Sum of Digits...
dp
,
greedy
,
implementation
1400
x45361
487A
Fight the Monster
binary search
,
brute force
,
implementation
1800
x3698
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x11607
485A
Factory
implementation
,
math
,
matrices
1400
x8156
484A
Bits
bitmasks
,
constructive algorithms
1700
x10998
483B
Friends and Presents
binary search
,
math
1800
x4016
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6308
479D
Long Jumps
binary search
,
greedy
,
implementation
1700
x4733
479C
Exams
greedy
,
sortings
1400
x29081
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7805
478C
Table Decorations
greedy
1800
x17789
476C
Dreamoon and Sums
math
1600
x5491
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8359
474D
Flowers
dp
1700
x24556
472C
Design Tutorial: Make It Nondeterministic
greedy
1400
x6342
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x7733
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
x7939
467C
George and Job
dp
,
implementation
1700
x14341
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x35274
464A
No to Palindromes!
greedy
,
strings
1700
x5839
460C
Present
binary search
,
data structures
,
greedy
1700
x6124
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12210
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x9810
457A
Golden System
math
,
meet-in-the-middle
1700
x1267
455A
Boredom
dp
1500
x56129
453A
Little Pony and Expected Maximum
probabilities
1600
x10202
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1988
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3312
449A
Jzzhu and Chocolate
greedy
,
math
1700
x3880
448D
Multiplication Table
binary search
,
brute force
1800
x13618
448B
Suffix Structures
implementation
,
strings
1400
x15890
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12387
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12350
444A
DZY Loves Physics
greedy
,
math
1600
x3385
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4015
442B
Andrey and Problem
greedy
,
math
,
probabilities
1800
x5192
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2100
441C
Valera and Tubes
constructive algorithms
,
dfs and similar
,
implementation
1500
x11078
441B
Valera and Fruits
greedy
,
implementation
1400
x6995
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
x5932
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3819
437C
The Child and Toy
graphs
,
greedy
,
sortings
1400
x13650
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9323
436C
Dungeons and Candies
dsu
,
graphs
,
greedy
,
trees
1800
x2600
436B
Om Nom and Spiders
implementation
,
math
1400
x3046
436A
Feed with Candy
greedy
1500
x3431
435C
Cardiogram
implementation
1600
x2553
435B
Pasha Maximizes
greedy
1400
x6830
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2416
432C
Prime Swaps
greedy
,
sortings
1800
x2452
431C
k-Tree
dp
,
implementation
,
trees
1600
x25094
430B
Balls Game
brute force
,
two pointers
1400
x3660
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2228
429B
Working out
dp
1600
x8412
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x13504
425A
Sereja and Swaps
brute force
,
sortings
1500
x3833
424C
Magic Formulas
math
1600
x5266
420B
Online Meeting
implementation
1800
x1012
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4637
417B
Crash
implementation
1400
x1765
417A
Elimination
dp
,
implementation
,
math
1500
x2935
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x7753
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8773
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6184
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x21495
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9724
413C
Jeopardy!
greedy
,
math
1400
x2329
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
x8777
409E
Dome
*special problem
1800
x565
409D
Big Data
*special problem
1700
x1702
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
x6461
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4786
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3101
405C
Unusual Product
implementation
,
math
1600
x4593
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x5098
404B
Marathon
implementation
,
math
1500
x2905
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2538
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x5761
402B
Trees in a Row
brute force
,
implementation
1400
x3758
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x19666
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2878
388A
Fox and Box Accumulation
greedy
,
sortings
1400
x11422
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
x9509
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3507
383A
Milking cows
data structures
,
greedy
1600
x5226
382C
Arithmetic Progression
implementation
,
sortings
1700
x8218
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2663
379C
New Year Ratings Change
greedy
,
sortings
1400
x6513
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