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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
—
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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Status
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Custom test
Problems
#
Name
1346C
Spring Cleaning
*special problem
,
greedy
,
sortings
1600
x605
1346B
Boot Camp
*special problem
,
greedy
1400
x1206
1344A
Hilbert's Hotel
math
,
number theory
,
sortings
1600
x15646
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12671
1342D
Multiple Testcases
binary search
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
1900
x6098
1342C
Yet Another Counting Problem
math
,
number theory
1600
x14037
1341B
Nastya and Door
greedy
,
implementation
1300
x19677
1340B
Nastya and Scoreboard
bitmasks
,
dp
,
graphs
,
greedy
1700
x7851
1340A
Nastya and Strange Generator
brute force
,
data structures
,
greedy
,
implementation
1500
x13418
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8467
1338A
Powered Addition
greedy
,
math
1500
x23999
1336B
Xenia and Colorful Gems
binary search
,
greedy
,
math
,
sortings
,
two pointers
1700
x11376
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x20416
1335E2
Three Blocks Palindrome (hard version)
brute force
,
data structures
,
dp
,
two pointers
1800
x8352
1335E1
Three Blocks Palindrome (easy version)
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x10848
1335D
Anti-Sudoku
constructive algorithms
,
implementation
1300
x27425
1334D
Minimum Euler Cycle
constructive algorithms
,
graphs
,
greedy
,
implementation
1800
x7307
1334C
Circle of Monsters
brute force
,
constructive algorithms
,
greedy
,
math
1600
x16617
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12584
1332D
Walk on Matrix
bitmasks
,
constructive algorithms
,
math
1700
x8190
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x16613
1332B
Composite Coloring
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1400
x17592
1330B
Dreamoon Likes Permutations
implementation
,
math
1400
x14056
1329B
Dreamoon Likes Sequences
bitmasks
,
combinatorics
,
math
1700
x6694
1329A
Dreamoon Likes Coloring
constructive algorithms
,
greedy
,
implementation
,
math
1800
x9135
1328E
Tree Queries
dfs and similar
,
graphs
,
trees
1900
x9554
1328D
Carousel
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
1800
x13176
1328B
K-th Beautiful String
binary search
,
brute force
,
combinatorics
,
implementation
,
math
1300
x29106
1327E
Count The Blocks
combinatorics
,
dp
,
math
1800
x8945
1327C
Game with Chips
constructive algorithms
,
implementation
1600
x13425
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x10162
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x12092
1326C
Permutation Partitions
combinatorics
,
greedy
,
math
1300
x15632
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x12121
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x13660
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x10013
1324E
Sleeping Schedule
dp
,
implementation
1700
x13577
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x28312
1323B
Count Subrectangles
binary search
,
greedy
,
implementation
1500
x9001
1322A
Unusual Competitions
greedy
1300
x12433
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9815
1320B
Navigation System
dfs and similar
,
graphs
,
shortest paths
1700
x6047
1320A
Journey Planning
data structures
,
dp
,
greedy
,
math
,
sortings
1400
x16376
1316C
Primitive Primes
constructive algorithms
,
math
,
ternary search
1800
x7285
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x11269
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x9198
1313C2
Skyscrapers (hard version)
data structures
,
dp
,
greedy
1900
x6495
1313C1
Skyscrapers (easy version)
brute force
,
data structures
,
dp
,
greedy
1500
x10434
1313B
Different Rules
constructive algorithms
,
greedy
,
implementation
,
math
1700
x6675
1312D
Count the Arrays
combinatorics
,
math
1700
x9469
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x16540
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x4251
1311C
Perform the Combo
brute force
1300
x16026
1310A
Recommendations
data structures
,
greedy
,
sortings
1700
x5175
1307D
Cow and Fields
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
sortings
1900
x6382
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11825
1307B
Cow and Friend
geometry
,
greedy
,
math
1300
x13258
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x5007
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x14647
1304D
Shortest and Longest LIS
constructive algorithms
,
graphs
,
greedy
,
two pointers
1800
x6329
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x16391
1303D
Fill The Bag
bitmasks
,
greedy
1900
x7099
1303C
Perfect Keyboard
dfs and similar
,
greedy
,
implementation
1600
x12168
1303B
National Project
math
1400
x15777
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9346
1301B
Motarack's Birthday
binary search
,
greedy
,
ternary search
1500
x14235
1299B
Aerodynamic
geometry
1800
x5248
1299A
Anu Has a Function
brute force
,
greedy
,
math
1500
x12035
1296E1
String Coloring (easy version)
constructive algorithms
,
dp
,
graphs
,
greedy
,
sortings
1800
x7487
1296D
Fight with Monsters
greedy
,
sortings
1500
x14262
1296C
Yet Another Walking Robot
data structures
,
implementation
1500
x14824
1295D
Same GCDs
math
,
number theory
1800
x8902
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12921
1295B
Infinite Prefixes
math
,
strings
1700
x9309
1294E
Obtain a Permutation
greedy
,
implementation
,
math
1900
x4923
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x11749
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x34814
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x6368
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x13354
1291B
Array Sharpening
greedy
,
implementation
1300
x14175
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5439
1290A
Mind Control
brute force
,
data structures
,
implementation
1600
x8569
1288C
Two Arrays
combinatorics
,
dp
1600
x12895
1287B
Hyperset
brute force
,
data structures
,
implementation
1500
x9443
1286B
Numbers on Tree
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1800
x4712
1286A
Garland
dp
,
greedy
,
sortings
1800
x8817
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7723
1285C
Fadi and LCM
brute force
,
math
,
number theory
1400
x23495
1285B
Just Eat It!
dp
,
greedy
,
implementation
1300
x22707
1284C
New Year and Permutation
combinatorics
,
math
1600
x8033
1284B
New Year and Ascent Sequence
binary search
,
combinatorics
,
data structures
,
dp
,
implementation
,
sortings
1400
x10830
1283E
New Year Parties
dp
,
greedy
1800
x6551
1283D
Christmas Trees
graphs
,
greedy
,
shortest paths
1800
x7796
1283C
Friends and Gifts
constructive algorithms
,
data structures
,
math
1500
x13144
1282C
Petya and Exam
greedy
,
sortings
,
two pointers
1800
x4311
1282B2
K for the Price of One (Hard Version)
dp
,
greedy
,
sortings
1600
x10190
1282B1
K for the Price of One (Easy Version)
dp
,
greedy
,
sortings
1400
x11490
1281B
Azamon Web Services
greedy
1600
x8296
1280B
Beingawesomeism
implementation
,
math
1800
x3941
1280A
Cut and Paste
implementation
,
math
1700
x5409
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