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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
22:40:14
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Difficulty:
—
greedy
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
#
Name
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x462
1601E
Phys Ed Online
data structures
,
dp
,
greedy
2900
x461
833C
Ever-Hungry Krakozyabra
brute force
,
combinatorics
,
greedy
,
math
2700
x460
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x459
1097E
Egor and an RPG game
constructive algorithms
,
greedy
3400
x458
335F
Buy One, Get One Free
dp
,
greedy
3000
x455
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x452
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x452
1481F
AB Tree
dp
,
greedy
,
trees
3100
x451
700D
Huffman Coding on Segment
data structures
,
greedy
3100
x448
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x447
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x446
1431D
Used Markers
*special problem
,
greedy
1500
x446
1662G
Gastronomic Event
dp
,
greedy
,
trees
x443
771E
Bear and Rectangle Strips
dp
,
greedy
3000
x439
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x439
649C
Печать условий
constructive algorithms
,
greedy
,
sortings
1500
x439
306B
Optimizer
data structures
,
greedy
,
sortings
2100
x437
1358F
Tasty Cookie
binary search
,
constructive algorithms
,
greedy
,
implementation
2700
x436
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x433
341E
Candies Game
constructive algorithms
,
greedy
3000
x427
1852D
Miriany and Matchstick
constructive algorithms
,
dp
,
greedy
2800
x426
1214F
Employment
greedy
,
sortings
2700
x422
1773D
Dominoes
combinatorics
,
flows
,
graph matchings
,
greedy
2600
x418
1455F
String and Operations
dp
,
greedy
2800
x417
30D
King's Problem?
geometry
,
greedy
2600
x409
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x405
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x404
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x403
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x401
83C
Track
graphs
,
greedy
,
shortest paths
2400
x401
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x399
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x396
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x395
1297C
Dream Team
*special problem
,
greedy
x394
671E
Organizing a Race
data structures
,
greedy
3300
x394
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x393
1238G
Adilbek and the Watering System
data structures
,
greedy
,
sortings
2700
x391
183D
T-shirt
dp
,
greedy
,
probabilities
2700
x391
125D
Two progressions
constructive algorithms
,
greedy
2200
x391
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x389
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x388
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x384
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x379
1647F
Madoka and Laziness
dp
,
greedy
3100
x376
852C
Property
greedy
,
sortings
2100
x374
1693E
Outermost Maximums
data structures
,
greedy
3400
x369
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x368
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x368
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x368
1738G
Anti-Increasing Addicts
constructive algorithms
,
dp
,
greedy
,
math
2900
x366
1416F
Showing Off
flows
,
graph matchings
,
greedy
,
implementation
3300
x363
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x362
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x361
1487F
Ones
dp
,
greedy
,
shortest paths
2900
x359
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x358
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x355
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x351
1067D
Computer Game
dp
,
greedy
,
math
,
probabilities
3100
x351
935F
Fafa and Array
data structures
,
greedy
2600
x345
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x345
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x345
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x344
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x343
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x342
191D
Metro Scheme
graphs
,
greedy
2700
x342
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x341
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x338
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x336
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x335
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x335
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x331
1488D
Problemsolving Marathon
*special problem
,
binary search
,
greedy
1900
x329
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x328
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x327
1368H1
Breadboard Capacity (easy version)
dp
,
flows
,
greedy
3300
x327
1292E
Rin and The Unknown Flower
constructive algorithms
,
greedy
,
interactive
,
math
3500
x327
625E
Frog Fights
data structures
,
greedy
2800
x323
936D
World of Tank
dp
,
greedy
3000
x322
883B
Berland Army
constructive algorithms
,
graphs
,
greedy
2600
x322
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x321
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x320
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x319
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x319
1411F
The Thorny Path
greedy
,
math
3000
x319
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x312
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x308
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x306
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x302
120I
Luck is in Numbers
greedy
2200
x302
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x300
1452F
Divide Powers
constructive algorithms
,
greedy
2900
x298
1910D
Remove and Add
*special problem
,
greedy
1800
x296
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x294
332E
Binary Key
dp
,
greedy
,
implementation
2400
x294
819A
Mister B and Boring Game
games
,
greedy
2200
x292
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x287
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x285
1599J
Bob's Beautiful Array
bitmasks
,
brute force
,
greedy
2600
x283
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x282
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