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Before contest
Codeforces Round 987 (Div. 2)
04:02:23
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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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Problems
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Status
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Custom test
Problems
#
Name
435C
Cardiogram
implementation
1600
x2579
435B
Pasha Maximizes
greedy
1400
x7044
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2488
432C
Prime Swaps
greedy
,
sortings
1800
x2522
431C
k-Tree
dp
,
implementation
,
trees
1600
x25806
430B
Balls Game
brute force
,
two pointers
1400
x3729
430A
Points and Segments (easy)
constructive algorithms
,
sortings
1600
x2250
429B
Working out
dp
1600
x8725
429A
Xor-tree
dfs and similar
,
trees
1300
x10415
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x14074
426B
Sereja and Mirroring
implementation
1300
x3806
425A
Sereja and Swaps
brute force
,
sortings
1500
x3912
424C
Magic Formulas
math
1600
x5434
421D
Bug in Code
binary search
,
data structures
,
sortings
1900
x541
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1264
420B
Online Meeting
implementation
1800
x1045
417D
Cunning Gena
bitmasks
,
dp
,
greedy
,
sortings
1900
x2531
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4676
417B
Crash
implementation
1400
x1790
417A
Elimination
dp
,
implementation
,
math
1500
x3020
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x8049
416B
Art Union
brute force
,
dp
,
implementation
1300
x8767
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8981
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6322
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x22563
414A
Mashmokh and Numbers
constructive algorithms
,
number theory
1500
x9850
413C
Jeopardy!
greedy
,
math
1400
x2388
413B
Spyke Chatting
implementation
1300
x1711
412E
E-mail Addresses
implementation
1900
x846
411C
Kicker
implementation
1700
x1229
411B
Multi-core Processor
implementation
1600
x1280
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8954
409F
000001
*special problem
1900
x2092
409E
Dome
*special problem
1800
x578
409D
Big Data
*special problem
1700
x1715
409C
Magnum Opus
*special problem
1700
x1981
409B
Mysterious Language
*special problem
1700
x1358
409A
The Great Game
*special problem
1700
x2468
407B
Long Path
dp
,
implementation
1600
x6593
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4895
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3123
405C
Unusual Product
implementation
,
math
1600
x4676
404D
Minesweeper 1D
dp
,
implementation
1900
x2157
404C
Restore Graph
dfs and similar
,
graphs
,
sortings
1800
x5235
404B
Marathon
implementation
,
math
1500
x2933
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2621
402C
Searching for Graph
brute force
,
constructive algorithms
,
graphs
1500
x5956
402B
Trees in a Row
brute force
,
implementation
1400
x3818
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x20066
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2901
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2481
388A
Fox and Box Accumulation
greedy
,
sortings
1400
x11503
387C
George and Number
greedy
,
implementation
1700
x2188
386B
Fly, freebies, fly!
binary search
,
brute force
,
implementation
1400
x2187
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9705
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3546
383A
Milking cows
data structures
,
greedy
1600
x5297
382C
Arithmetic Progression
implementation
,
sortings
1700
x8318
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2684
379C
New Year Ratings Change
greedy
,
sortings
1400
x6565
378B
Semifinals
implementation
,
sortings
1300
x5252
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x2107
377A
Maze
dfs and similar
1600
x22666
376B
I.O.U.
implementation
1300
x6410
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x5077
375A
Divisible by Seven
math
,
number theory
1600
x4857
374C
Inna and Dima
dfs and similar
,
dp
,
graphs
,
implementation
1900
x2754
374B
Inna and Nine
combinatorics
,
greedy
1500
x3325
373B
Making Sequences is Fun
binary search
,
implementation
,
math
1600
x2484
372B
Counting Rectangles is Fun
brute force
,
divide and conquer
,
dp
1900
x2628
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x13127
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5698
371C
Hamburgers
binary search
,
brute force
1600
x26768
371B
Fox Dividing Cheese
math
,
number theory
1300
x11462
370C
Mittens
constructive algorithms
,
greedy
,
sortings
1800
x1583
370B
Berland Bingo
implementation
1300
x2526
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x10149
369B
Valera and Contest
constructive algorithms
,
implementation
,
math
1400
x6514
367B
Sereja ans Anagrams
binary search
,
data structures
1900
x2476
367A
Sereja and Algorithm
data structures
,
implementation
1500
x4332
366C
Dima and Salad
dp
1900
x4860
364A
Matrix
combinatorics
,
data structures
,
implementation
1600
x4674
363D
Renting Bikes
binary search
,
greedy
1800
x3962
363C
Fixing Typos
greedy
,
implementation
1400
x13368
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1787
362A
Two Semiknights Meet
greedy
,
math
1500
x2675
360A
Levko and Array Recovery
greedy
,
implementation
1700
x2057
359C
Prime Number
math
,
number theory
1900
x3140
359B
Permutation
constructive algorithms
,
dp
,
math
1400
x8062
358D
Dima and Hares
dp
,
greedy
1800
x4086
358B
Dima and Text Messages
brute force
,
strings
1500
x3733
358A
Dima and Continuous Line
brute force
,
implementation
1400
x7770
357B
Flag Day
constructive algorithms
,
implementation
1400
x8205
356B
Xenia and Hamming
implementation
,
math
1900
x1932
356A
Knight Tournament
data structures
,
dsu
1500
x13743
354A
Vasya and Robot
brute force
,
greedy
,
math
1500
x5485
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4884
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2289
352B
Jeff and Periods
implementation
,
sortings
1300
x16586
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2405
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