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Codeforces Round sponsored by NEAR (Div. 1 + Div. 2)
43:34:03
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Difficulty:
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implementation
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
452A
Eevee
brute force
,
implementation
,
strings
1000
x7935
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3311
451B
Sort the Array
implementation
,
sortings
1300
x44178
451A
Game With Sticks
implementation
900
x64072
450B
Jzzhu and Sequences
implementation
,
math
1300
x25773
450A
Jzzhu and Children
implementation
1000
x33346
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1458
448B
Suffix Structures
implementation
,
strings
1400
x15868
448A
Rewards
implementation
800
x24044
447B
DZY Loves Strings
greedy
,
implementation
1000
x20142
447A
DZY Loves Hash
implementation
800
x9494
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12373
445A
DZY Loves Chessboard
dfs and similar
,
implementation
1200
x28886
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4011
443A
Anton and Letters
constructive algorithms
,
implementation
800
x86520
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2099
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1073
441C
Valera and Tubes
constructive algorithms
,
dfs and similar
,
implementation
1500
x11062
441B
Valera and Fruits
greedy
,
implementation
1400
x6994
441A
Valera and Antique Items
implementation
1000
x18330
440B
Balancer
greedy
,
implementation
1600
x1930
440A
Forgotten Episode
implementation
800
x7200
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3817
439B
Devu, the Dumb Guy
implementation
,
sortings
1200
x14160
439A
Devu, the Singer and Churu, the Joker
greedy
,
implementation
900
x25087
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9316
437A
The Child and Homework
implementation
1300
x8937
436B
Om Nom and Spiders
implementation
,
math
1400
x3045
435C
Cardiogram
implementation
1600
x2552
435A
Queue on Bus Stop
implementation
1000
x10052
433D
Nanami's Digital Board
dsu
,
implementation
2000
x1091
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2415
433B
Kuriyama Mirai's Stones
dp
,
implementation
,
sortings
1200
x37647
433A
Kitahara Haruki's Gift
brute force
,
implementation
1100
x16035
432B
Football Kit
brute force
,
greedy
,
implementation
1200
x11586
432A
Choosing Teams
greedy
,
implementation
,
sortings
800
x58024
431C
k-Tree
dp
,
implementation
,
trees
1600
x25061
431B
Shower Line
brute force
,
implementation
1200
x10630
431A
Black Square
implementation
800
x53010
427E
Police Patrol
greedy
,
implementation
,
math
,
ternary search
2000
x1411
427B
Prison Transfer
data structures
,
implementation
1100
x13813
427A
Police Recruits
implementation
800
x74875
426B
Sereja and Mirroring
implementation
1300
x3782
426A
Sereja and Mugs
implementation
800
x9081
424B
Megacity
binary search
,
greedy
,
implementation
,
sortings
1200
x7410
424A
Squats
implementation
900
x8304
421A
Pasha and Hamsters
constructive algorithms
,
implementation
800
x5843
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1229
420B
Online Meeting
implementation
1800
x1012
420A
Start Up
implementation
1000
x6054
417C
Football
constructive algorithms
,
graphs
,
implementation
1400
x4635
417B
Crash
implementation
1400
x1762
417A
Elimination
dp
,
implementation
,
math
1500
x2933
416D
Population Size
greedy
,
implementation
,
math
2400
x935
416C
Booking System
binary search
,
dp
,
greedy
,
implementation
1600
x7745
416B
Art Union
brute force
,
dp
,
implementation
1300
x8574
416A
Guess a number!
greedy
,
implementation
,
two pointers
1400
x8748
415B
Mashmokh and Tokens
binary search
,
greedy
,
implementation
,
math
1500
x6179
415A
Mashmokh and Lights
implementation
900
x8889
413B
Spyke Chatting
implementation
1300
x1684
413A
Data Recovery
implementation
1200
x2564
412E
E-mail Addresses
implementation
1900
x828
412C
Pattern
implementation
,
strings
1200
x3900
412A
Poster
greedy
,
implementation
900
x4354
411C
Kicker
implementation
1700
x1218
411B
Multi-core Processor
implementation
1600
x1270
411A
Password Check
*special problem
,
implementation
800
x7130
409H
A + B Strikes Back
*special problem
,
brute force
,
constructive algorithms
,
dsu
,
implementation
1500
x8769
408B
Garland
implementation
1200
x9079
408A
Line to Cashier
implementation
900
x11122
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x961
407B
Long Path
dp
,
implementation
1600
x6458
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4784
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x232
405D
Toy Sum
greedy
,
implementation
,
math
1700
x3101
405C
Unusual Product
implementation
,
math
1600
x4589
405A
Gravity Flip
greedy
,
implementation
,
sortings
900
x97275
404E
Maze 1D
binary search
,
greedy
,
implementation
2200
x571
404D
Minesweeper 1D
dp
,
implementation
1900
x2087
404B
Marathon
implementation
,
math
1500
x2903
404A
Valera and X
implementation
1000
x23414
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x203
402B
Trees in a Row
brute force
,
implementation
1400
x3754
401C
Team
constructive algorithms
,
greedy
,
implementation
1400
x19626
401B
Sereja and Contests
greedy
,
implementation
,
math
1200
x4408
401A
Vanya and Cards
implementation
,
math
800
x15995
400C
Inna and Huge Candy Matrix
implementation
,
math
1500
x2878
400B
Inna and New Matrix of Candies
brute force
,
implementation
,
schedules
1200
x7500
400A
Inna and Choose Options
implementation
1000
x6426
399A
Pages
implementation
x4083
398A
Cards
constructive algorithms
,
implementation
x916
397B
On Corruption and Numbers
constructive algorithms
,
implementation
,
math
x740
397A
On Segment's Own Points
implementation
x2600
394D
Physical Education and Buns
brute force
,
implementation
,
math
x263
394A
Counting Sticks
brute force
,
implementation
x2639
391A
Genetic Engineering
implementation
,
two pointers
x1709
390B
Inna, Dima and Song
implementation
x1171
390A
Inna and Alarm Clock
implementation
x3483
389B
Fox and Cross
greedy
,
implementation
1100
x6848
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2452
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