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Before contest
CodeCraft-22 and Codeforces Round #795 (Div. 2)
3 days
→ Filter Problems
Difficulty:
—
data structures
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
4C
Registration System
data structures
,
hashing
,
implementation
1300
x49287
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x29500
368B
Sereja and Suffixes
data structures
,
dp
1100
x28762
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x26773
1520D
Same Differences
data structures
,
hashing
,
math
1200
x25240
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x21735
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x20961
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x20848
1348B
Phoenix and Beauty
constructive algorithms
,
data structures
,
greedy
,
sortings
1400
x20179
1213B
Bad Prices
data structures
,
implementation
1100
x19820
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x19238
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x19184
1380A
Three Indices
brute force
,
data structures
900
x18586
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x18335
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x18208
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x17522
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x17514
1200A
Hotelier
brute force
,
data structures
,
implementation
800
x17501
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x17409
339D
Xenia and Bit Operations
data structures
,
trees
1700
x16815
1375C
Element Extermination
constructive algorithms
,
data structures
,
greedy
1400
x16708
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x16572
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x16541
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x16441
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x16417
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x16233
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x16196
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x16172
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x15748
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x15739
1492B
Card Deck
data structures
,
greedy
,
math
1100
x15608
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x15535
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x15049
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x14750
1526C1
Potions (Easy Version)
brute force
,
data structures
,
dp
,
greedy
1500
x14412
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x14318
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x14174
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x14118
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x13865
767A
Snacktower
data structures
,
implementation
1100
x13824
1526C2
Potions (Hard Version)
data structures
,
greedy
1600
x13515
1490E
Accidental Victory
binary search
,
data structures
,
greedy
1400
x13453
1320A
Journey Planning
data structures
,
dp
,
greedy
,
math
,
sortings
1400
x13367
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x13330
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x13148
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x12972
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x12969
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x12835
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x12736
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x12706
1104B
Game with string
data structures
,
implementation
,
math
1200
x12532
1296C
Yet Another Walking Robot
data structures
,
implementation
1500
x12530
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x12481
650A
Watchmen
data structures
,
geometry
,
math
1400
x12446
1340A
Nastya and Strange Generator
brute force
,
data structures
,
greedy
,
implementation
1500
x12441
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x12345
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x12157
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x12150
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x12078
1292A
NEKO's Maze Game
data structures
,
dsu
,
implementation
1400
x11862
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x11750
427B
Prison Transfer
data structures
,
implementation
1100
x11543
1490F
Equalize the Array
binary search
,
data structures
,
greedy
,
math
,
sortings
1500
x11432
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x11431
1374E1
Reading Books (easy version)
data structures
,
greedy
,
sortings
1600
x11421
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x11396
295A
Greg and Array
data structures
,
implementation
1400
x11074
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x11041
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x11010
1283C
Friends and Gifts
constructive algorithms
,
data structures
,
math
1500
x10976
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x10907
1234D
Distinct Characters Queries
data structures
1600
x10775
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x10761
1007A
Reorder the Array
combinatorics
,
data structures
,
math
,
sortings
,
two pointers
1300
x10733
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x10731
816B
Karen and Coffee
binary search
,
data structures
,
implementation
1400
x10691
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x10677
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x10534
1214C
Bad Sequence
data structures
,
greedy
1200
x10496
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x10474
1621B
Integers Shop
data structures
,
greedy
,
implementation
1500
x10422
1499C
Minimum Grid Path
brute force
,
data structures
,
greedy
,
math
1500
x10399
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x10298
701B
Cells Not Under Attack
data structures
,
math
1200
x10041
1279C
Stack of Presents
data structures
,
implementation
1400
x10009
1416A
k-Amazing Numbers
binary search
,
data structures
,
implementation
,
two pointers
1500
x9892
1679B
Stone Age Problem
data structures
,
implementation
1200
x9831
356A
Knight Tournament
data structures
,
dsu
1500
x9824
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x9791
1100B
Build a Contest
data structures
,
implementation
1300
x9748
1294D
MEX maximizing
data structures
,
greedy
,
implementation
,
math
1600
x9685
879B
Table Tennis
data structures
,
implementation
1200
x9684
1474C
Array Destruction
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
1700
x9677
1284B
New Year and Ascent Sequence
binary search
,
combinatorics
,
data structures
,
dp
,
implementation
,
sortings
1400
x9590
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x9530
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x9493
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x9335
380C
Sereja and Brackets
data structures
,
schedules
2000
x9296
18C
Stripe
data structures
,
implementation
1200
x9189
1189C
Candies!
data structures
,
dp
,
implementation
,
math
1400
x9170
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