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Codeforces Round (Div. 2)
29:06:35
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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
1313C1
Skyscrapers (easy version)
brute force
,
data structures
,
dp
,
greedy
1500
x10338
1313B
Different Rules
constructive algorithms
,
greedy
,
implementation
,
math
1700
x6652
1312D
Count the Arrays
combinatorics
,
math
1700
x9275
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x16246
1310A
Recommendations
data structures
,
greedy
,
sortings
1700
x5148
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11749
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x14201
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6274
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x16170
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x12081
1303B
National Project
math
1400
x15625
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9266
1301B
Motarack's Birthday
binary search
,
greedy
,
ternary search
1500
x14093
1299B
Aerodynamic
geometry
1800
x5216
1299A
Anu Has a Function
brute force
,
greedy
,
math
1500
x11951
1296E1
String Coloring (easy version)
constructive algorithms
,
dp
,
graphs
,
greedy
,
sortings
1800
x7380
1296D
Fight with Monsters
greedy
,
sortings
1500
x14151
1296C
Yet Another Walking Robot
data structures
,
implementation
1500
x14702
1295D
Same GCDs
math
,
number theory
1800
x8717
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12797
1295B
Infinite Prefixes
math
,
strings
1700
x9258
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11602
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x6284
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x13149
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5245
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8531
1288C
Two Arrays
combinatorics
,
dp
1600
x12625
1287B
Hyperset
brute force
,
data structures
,
implementation
1500
x9392
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4640
1286A
Garland
dp
,
greedy
,
sortings
1800
x8683
1285C
Fadi and LCM
brute force
,
math
,
number theory
1400
x22863
1284C
New Year and Permutation
combinatorics
,
math
1600
x7950
1284B
New Year and Ascent Sequence
binary search
,
combinatorics
,
data structures
,
dp
,
implementation
,
sortings
1400
x10784
1283E
New Year Parties
dp
,
greedy
1800
x6487
1283D
Christmas Trees
graphs
,
greedy
,
shortest paths
1800
x7691
1283C
Friends and Gifts
constructive algorithms
,
data structures
,
math
1500
x13048
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4270
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10090
1282B1
K for the Price of One (Easy Version)
dp
,
greedy
,
sortings
1400
x11406
1281B
Azamon Web Services
greedy
1600
x8239
1280B
Beingawesomeism
implementation
,
math
1800
x3912
1280A
Cut and Paste
implementation
,
math
1700
x5349
1279D
Santa's Bot
combinatorics
,
math
,
probabilities
1700
x6163
1279C
Stack of Presents
data structures
,
implementation
1400
x11620
1278C
Berry Jam
data structures
,
dp
,
greedy
,
implementation
1700
x7914
1278B
A and B
greedy
,
math
1500
x13148
1276A
As Simple as One and Two
dp
,
greedy
1400
x12241
1272D
Remove One Element
brute force
,
dp
1500
x16287
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x13930
1269B
Modulo Equality
brute force
,
sortings
1500
x9083
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8504
1267L
Lexicography
constructive algorithms
,
strings
1800
x3006
1267J
Just Arrange the Icons
greedy
,
implementation
,
math
1800
x2783
1267E
Elections
greedy
1700
x3153
1266C
Diverse Matrix
constructive algorithms
,
greedy
,
math
,
number theory
1400
x9587
1264A
Beautiful Regional Contest
greedy
,
implementation
1500
x10017
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13720
1263C
Everyone is a Winner!
binary search
,
math
,
meet-in-the-middle
,
number theory
1400
x13579
1263B
PIN Codes
greedy
,
implementation
1400
x11299
1260C
Infinite Fence
greedy
,
math
,
number theory
1700
x8177
1257D
Yet Another Monster Killing Problem
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
1700
x7480
1256D
Binary String Minimizing
greedy
1500
x11937
1256C
Platforms Jumping
greedy
1700
x6833
1256B
Minimize the Permutation
greedy
1400
x13006
1255C
League of Leesins
constructive algorithms
,
implementation
1600
x6668
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4591
1254A
Feeding Chicken
constructive algorithms
,
greedy
,
implementation
1700
x5144
1253D
Harmonious Graph
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
1700
x9070
1253C
Sweets Eating
dp
,
greedy
,
math
,
sortings
1500
x14099
1253B
Silly Mistake
greedy
,
implementation
1400
x11116
1252H
Twin Buildings
greedy
,
implementation
1800
x2608
1252C
Even Path
data structures
,
implementation
1600
x3648
1251C
Minimize The Integer
greedy
,
two pointers
1600
x12103
1251B
Binary Palindromes
greedy
,
strings
1400
x10929
1250L
Divide The Students
binary search
,
greedy
,
math
1500
x4056
1250J
The Parade
binary search
,
greedy
1800
x2892
1250H
Happy Birthday
math
1500
x4014
1250B
The Feast and the Bus
brute force
,
constructive algorithms
,
greedy
,
math
1800
x2585
1250A
Berstagram
implementation
1400
x4051
1249E
By Elevator or Stairs?
dp
,
shortest paths
1700
x9516
1249D2
Too Many Segments (hard version)
data structures
,
greedy
,
sortings
1800
x5162
1249D1
Too Many Segments (easy version)
greedy
1800
x5030
1249C2
Good Numbers (hard version)
binary search
,
greedy
,
math
,
meet-in-the-middle
1500
x12493
1245C
Constanze's Machine
dp
1400
x17270
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x7449
1243B2
Character Swap (Hard Version)
strings
1600
x7055
1242A
Tile Painting
constructive algorithms
,
math
,
number theory
1500
x12505
1239A
Ivan the Fool and the Probability Theory
combinatorics
,
dp
,
math
1700
x7298
1238C
Standard Free2play
dp
,
greedy
,
math
1600
x7348
1237C1
Balanced Removals (Easier)
constructive algorithms
,
geometry
,
greedy
1700
x6045
1236B
Alice and the List of Presents
combinatorics
,
math
1500
x10937
1234D
Distinct Characters Queries
data structures
1600
x14619
1234C
Pipes
dp
,
implementation
1500
x12453
1228C
Primes and Multiplication
math
,
number theory
1700
x8932
1228B
Filling the Grid
implementation
,
math
1400
x11482
1227D2
Optimal Subsequences (Hard Version)
data structures
,
greedy
1800
x4285
1227D1
Optimal Subsequences (Easy Version)
data structures
,
greedy
1600
x6348
1227C
Messy
constructive algorithms
1700
x5487
1225D
Power Products
hashing
,
math
,
number theory
1800
x7758
1225C
p-binary
bitmasks
,
brute force
,
math
1600
x8868
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