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Codeforces Round 987 (Div. 2)
13:51:54
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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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Custom test
Problems
#
Name
412A
Poster
greedy
,
implementation
900
x4467
411A
Password Check
*special problem
,
implementation
800
x7274
408B
Garland
implementation
1200
x9361
408A
Line to Cashier
implementation
900
x11280
405B
Domino Effect
1100
x5777
405A
Gravity Flip
greedy
,
implementation
,
sortings
900
x102498
404A
Valera and X
implementation
1000
x24061
402A
Nuts
greedy
,
math
1100
x4613
401B
Sereja and Contests
greedy
,
implementation
,
math
1200
x4436
401A
Vanya and Cards
implementation
,
math
800
x16318
400B
Inna and New Matrix of Candies
brute force
,
implementation
,
schedules
1200
x7770
400A
Inna and Choose Options
implementation
1000
x6528
389B
Fox and Cross
greedy
,
implementation
1100
x6936
389A
Fox and Number Game
greedy
,
math
1000
x14089
387B
George and Round
brute force
,
greedy
,
two pointers
1200
x12269
387A
George and Sleep
implementation
900
x9703
386A
Second-Price Auction
implementation
800
x6439
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x9966
385A
Bear and Raspberry
brute force
,
greedy
,
implementation
1000
x16515
384A
Coder
implementation
800
x16329
382A
Ksenia and Pan Scales
greedy
,
implementation
1100
x12451
381B
Sereja and Stairs
greedy
,
implementation
,
sortings
1100
x6807
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x67144
379B
New Year Present
constructive algorithms
,
implementation
1200
x7267
379A
New Year Candles
implementation
1000
x46619
378A
Playing with Dice
brute force
800
x24103
376A
Lever
implementation
,
math
900
x9355
373A
Collecting Beats is Fun
implementation
900
x10721
371A
K-Periodic Array
greedy
,
implementation
,
math
1000
x6122
370A
Rook, Bishop and King
graphs
,
math
,
shortest paths
1100
x10343
369A
Valera and Plates
greedy
,
implementation
900
x11069
368B
Sereja and Suffixes
data structures
,
dp
1100
x42422
368A
Sereja and Coat Rack
implementation
1000
x7520
366B
Dima and To-do List
brute force
,
implementation
1200
x6836
366A
Dima and Guards
implementation
1100
x4536
365B
The Fibonacci Segment
implementation
1100
x14536
365A
Good Number
implementation
1100
x18772
363B
Fence
brute force
,
dp
1100
x53806
363A
Soroban
implementation
800
x10794
362B
Petya and Staircases
implementation
,
sortings
1100
x13873
361B
Levko and Permutation
constructive algorithms
,
math
,
number theory
1200
x8086
361A
Levko and Table
constructive algorithms
,
implementation
800
x16753
359A
Table
constructive algorithms
,
greedy
,
implementation
1000
x8564
357A
Group of Students
brute force
,
greedy
,
implementation
1000
x6855
355B
Vasya and Public Transport
greedy
,
implementation
1100
x4509
355A
Vasya and Digital Root
constructive algorithms
,
implementation
1100
x9451
353A
Domino
implementation
,
math
1200
x18591
352A
Jeff and Digits
brute force
,
implementation
,
math
1000
x25819
350A
TL
brute force
,
greedy
,
implementation
1200
x16458
349A
Cinema Line
greedy
,
implementation
1100
x30282
347B
Fixed Points
brute force
,
implementation
,
math
1100
x9332
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8884
344A
Magnets
implementation
800
x122094
342A
Xenia and Divisors
greedy
,
implementation
1200
x12643
340A
The Wall
math
1200
x7682
339B
Xenia and Ringroad
implementation
1000
x70343
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x217093
337A
Puzzles
greedy
900
x80612
336A
Vasily the Bear and Triangle
implementation
,
math
1000
x10117
334A
Candy Bags
implementation
1000
x18692
331C1
The Great Julya Calendar
dp
1100
x6186
330A
Cakeminator
brute force
,
implementation
800
x28779
327B
Hungry Sequence
math
1200
x19838
327A
Flipping Game
brute force
,
dp
,
implementation
1200
x42262
322A
Ciel and Dancing
greedy
1000
x8231
320A
Magic Numbers
brute force
,
greedy
900
x38901
318A
Even Odds
math
900
x115539
316A1
Special Task
greedy
1100
x2672
315B
Sereja and Array
implementation
1200
x7026
313B
Ilya and Queries
dp
,
implementation
1100
x44927
313A
Ilya and Bank Account
implementation
,
number theory
900
x56748
312A
Whose sentence is it?
implementation
,
strings
1100
x4987
306A
Candies
implementation
800
x7046
304A
Pythagorean Theorem II
brute force
,
math
1200
x10695
302B
Eugeny and Play List
binary search
,
implementation
,
two pointers
1200
x8223
302A
Eugeny and Array
implementation
800
x9098
300A
Array
brute force
,
constructive algorithms
,
implementation
1100
x23155
299B
Ksusha the Squirrel
brute force
,
implementation
900
x5347
299A
Ksusha and Array
brute force
,
number theory
,
sortings
1000
x8119
298B
Sail
brute force
,
greedy
,
implementation
1200
x14247
296A
Yaroslav and Permutations
greedy
,
math
1100
x23276
294A
Shaass and Oskols
implementation
,
math
800
x23779
292B
Network Topology
graphs
,
implementation
1200
x8477
292A
SMSC
implementation
1100
x2706
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x6102
289A
Polo the Penguin and Segments
brute force
,
implementation
1100
x9295
287A
IQ Test
brute force
,
implementation
1100
x19935
285C
Building Permutation
greedy
,
implementation
,
sortings
1200
x23399
285B
Find Marble
implementation
1200
x15065
285A
Slightly Decreasing Permutations
greedy
,
implementation
1100
x13378
284B
Cows and Poker Game
brute force
,
implementation
1000
x6857
282A
Bit++
implementation
800
x266915
281A
Word Capitalization
implementation
,
strings
800
x214605
278A
Circle Line
implementation
800
x11691
276A
Lunch Rush
implementation
900
x27781
275A
Lights Out
implementation
900
x30416
272A
Dima and Friends
implementation
,
math
1000
x24751
271A
Beautiful Year
brute force
800
x140164
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x45749
268B
Buttons
implementation
,
math
1000
x32617
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