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Educational Codeforces Round 168 (Rated for Div. 2)
26:20:25
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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
#
Name
1561A
Simply Strange Sort
brute force
,
implementation
,
sortings
800
x16510
1560C
Infinity Table
implementation
,
math
800
x26367
1560B
Who's Opposite?
math
800
x35227
1560A
Dislike of Threes
implementation
800
x57969
1557A
Ezzat and Two Subsequences
brute force
,
math
,
sortings
800
x27733
1556A
A Variety of Operations
math
800
x18009
1554A
Cherry
greedy
800
x29008
1553A
Digits Sum
math
,
number theory
800
x30650
1552A
Subsequence Permutation
sortings
,
strings
800
x23690
1551B1
Wonderful Coloring - 1
greedy
,
strings
800
x28977
1551A
Polycarp and Coins
greedy
,
math
800
x49769
1550A
Find The Array
greedy
,
math
800
x27884
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x24104
1549A
Gregor and Cryptography
math
,
number theory
800
x32011
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x26192
1547A
Shortest Path with Obstacle
implementation
,
math
800
x30212
1546A
AquaMoon and Two Arrays
brute force
,
greedy
800
x18158
1542A
Odd Set
math
800
x43811
1541A
Pretty Permutations
constructive algorithms
,
greedy
,
implementation
800
x29228
1539B
Love Song
dp
,
implementation
,
strings
800
x24174
1538B
Friends and Candies
greedy
,
math
800
x31452
1538A
Stone Game
brute force
,
dp
,
greedy
800
x36363
1537A
Arithmetic Array
greedy
,
math
800
x36714
1536A
Omkar and Bad Story
brute force
,
constructive algorithms
800
x20133
1535A
Fair Playoff
brute force
,
implementation
800
x47988
1534A
Colour the Flag
brute force
,
implementation
800
x12665
1530B
Putting Plates
constructive algorithms
,
implementation
800
x15738
1530A
Binary Decimal
greedy
,
math
800
x20965
1529A
Eshag Loves Big Arrays
constructive algorithms
,
greedy
,
math
800
x29592
1527A
And Then There Were K
bitmasks
800
x34900
1526A
Mean Inequality
constructive algorithms
,
sortings
800
x24035
1525A
Potion-making
math
,
number theory
800
x25236
1523A
Game of Life
implementation
800
x13444
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x43741
1520A
Do Not Be Distracted!
brute force
,
implementation
800
x50859
1519B
The Cake Is a Lie
dp
,
math
800
x30491
1519A
Red and Blue Beans
math
800
x28535
1517A
Sum of 2050
greedy
,
math
800
x25376
1516A
Tit for Tat
greedy
800
x23255
1515A
Phoenix and Gold
constructive algorithms
,
greedy
,
math
800
x20133
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23958
1513A
Array and Peaks
constructive algorithms
,
implementation
800
x19260
1512B
Almost Rectangle
implementation
800
x25203
1512A
Spy Detected!
brute force
,
implementation
800
x62019
1511A
Review Site
greedy
800
x27388
1509A
Average Height
constructive algorithms
800
x25866
1506A
Strange Table
math
800
x30378
1504A
Déjà Vu
constructive algorithms
,
strings
800
x21556
1501A
Alexey and Train
implementation
800
x11553
1499A
Domino on Windowsill
combinatorics
,
constructive algorithms
,
math
800
x21099
1498A
GCD Sum
brute force
,
math
800
x22993
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x24113
1493A
Anti-knapsack
constructive algorithms
,
greedy
800
x19184
1492A
Three swimmers
math
800
x22553
1491A
K-th Largest Value
brute force
,
greedy
,
implementation
800
x18133
1490A
Dense Array
greedy
,
math
800
x30932
1487A
Arena
implementation
,
sortings
800
x26348
1482A
Prison Break
math
800
x20316
1481A
Space Navigation
greedy
,
strings
800
x24789
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x25696
1478A
Nezzar and Colorful Balls
brute force
,
greedy
800
x25992
1474A
Puzzle From the Future
greedy
800
x22323
1473A
Replacing Elements
greedy
,
implementation
,
math
,
sortings
800
x33321
1472B
Fair Division
dp
,
greedy
,
math
800
x49017
1472A
Cards for Friends
greedy
,
math
800
x41484
1468E
Four Segments
greedy
800
x8745
1466B
Last minute enhancements
dp
,
greedy
800
x22555
1466A
Bovine Dilemma
brute force
,
geometry
,
math
800
x22443
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x26940
1462A
Favorite Sequence
implementation
,
two pointers
800
x40949
1461A
String Generation
constructive algorithms
,
greedy
800
x18525
1459A
Red-Blue Shuffle
math
,
probabilities
800
x16944
1455A
Strange Functions
math
,
number theory
800
x26283
1454B
Unique Bid Auction
implementation
800
x27853
1454A
Special Permutation
constructive algorithms
,
probabilities
800
x39974
1453A
Cancel the Trains
implementation
800
x22420
1452C
Two Brackets
greedy
800
x19309
1452A
Robot Program
math
800
x21995
1451A
Subtract or Divide
greedy
,
math
800
x24091
1450A
Avoid Trygub
constructive algorithms
,
sortings
800
x17657
1447A
Add Candies
constructive algorithms
,
math
800
x13745
1445A
Array Rearrangment
greedy
,
sortings
800
x19042
1443A
Kids Seating
constructive algorithms
,
math
800
x16181
1440A
Buy the String
implementation
,
math
800
x19661
1438A
Specific Tastes of Andre
constructive algorithms
,
implementation
800
x19196
1437A
Marketing Scheme
brute force
,
constructive algorithms
,
greedy
,
math
800
x17975
1436A
Reorder
math
800
x22597
1433B
Yet Another Bookshelf
greedy
,
implementation
800
x28265
1433A
Boring Apartments
implementation
,
math
800
x51018
1431A
Selling Hamburgers
*special problem
800
x1823
1430B
Barrels
greedy
,
implementation
,
sortings
800
x19302
1428A
Box is Pull
math
800
x16238
1426A
Floor Number
implementation
,
math
800
x46895
1422A
Fence
geometry
,
math
800
x20809
1421A
XORwice
bitmasks
,
greedy
,
math
800
x28267
1417A
Copy-paste
greedy
,
math
800
x18187
1415A
Prison Break
brute force
,
math
800
x15073
1413A
Finding Sasuke
constructive algorithms
,
math
800
x14694
1411A
In-game Chat
implementation
800
x20516
1409A
Yet Another Two Integers Problem
greedy
,
math
800
x64515
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