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Before contest
Codeforces Round 941 (Div. 1)
4 days
Before contest
Codeforces Round 941 (Div. 2)
4 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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Problems
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Status
Standings
Custom test
Problems
#
Name
4C
Registration System
data structures
,
hashing
,
implementation
1300
x76630
1703B
ICPC Balloons
data structures
,
implementation
800
x44940
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42308
368B
Sereja and Suffixes
data structures
,
dp
1100
x39365
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x37580
1760C
Advantage
data structures
,
implementation
,
sortings
800
x34771
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34453
1722C
Word Game
data structures
,
implementation
800
x29256
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x29210
1807D
Odd Queries
data structures
,
implementation
900
x28382
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27248
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x26844
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x26803
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26710
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x26595
1213B
Bad Prices
data structures
,
implementation
1100
x25539
1690C
Restoring the Duration of Tasks
data structures
,
greedy
,
implementation
800
x25334
1348B
Phoenix and Beauty
constructive algorithms
,
data structures
,
greedy
,
sortings
1400
x24492
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x24183
1398C
Good Subarrays
data structures
,
dp
,
math
1600
x24024
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x23873
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x23818
339D
Xenia and Bit Operations
data structures
,
trees
1700
x23521
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x23258
1380A
Three Indices
brute force
,
data structures
900
x23071
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x22974
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x22852
1730A
Planets
data structures
,
greedy
,
sortings
800
x22467
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22256
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x22177
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x22029
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x21887
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x21782
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x21691
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x21615
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21572
1702C
Train and Queries
data structures
,
greedy
1100
x21405
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21171
1526C1
Potions (Easy Version)
brute force
,
data structures
,
dp
,
greedy
1500
x21081
1526C2
Potions (Hard Version)
data structures
,
greedy
1600
x20863
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20720
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x20638
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20497
1375C
Element Extermination
constructive algorithms
,
data structures
,
greedy
1400
x20390
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20355
1165B
Polycarp Training
data structures
,
greedy
,
sortings
1000
x20180
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20108
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20103
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x19976
1200A
Hotelier
brute force
,
data structures
,
implementation
800
x19890
1381A1
Prefix Flip (Easy Version)
constructive algorithms
,
data structures
,
strings
1300
x19814
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19798
1428C
ABBB
brute force
,
data structures
,
greedy
,
strings
1100
x19591
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x19543
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19535
767A
Snacktower
data structures
,
implementation
1100
x19160
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19157
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19095
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19086
1438B
Valerii Against Everyone
constructive algorithms
,
data structures
,
greedy
,
sortings
1000
x18341
1490E
Accidental Victory
binary search
,
data structures
,
greedy
1400
x18308
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18173
1492B
Card Deck
data structures
,
greedy
,
math
1100
x18075
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18030
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x18015
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x17993
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x17979
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x17850
1698C
3SUM Closure
brute force
,
data structures
1300
x17835
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17755
1399D
Binary String To Subsequences
constructive algorithms
,
data structures
,
greedy
,
implementation
1500
x17622
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17573
1353D
Constructing the Array
constructive algorithms
,
data structures
,
sortings
1600
x17293
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x17093
1689B
Mystic Permutation
data structures
,
greedy
900
x17071
1679B
Stone Age Problem
data structures
,
implementation
1200
x16856
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x16784
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16633
1234B2
Social Network (hard version)
data structures
,
implementation
1300
x16431
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x16425
816B
Karen and Coffee
binary search
,
data structures
,
implementation
1400
x16329
1393B
Applejack and Storages
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x16220
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16016
1730C
Minimum Notation
data structures
,
greedy
,
math
,
sortings
1200
x16004
295A
Greg and Array
data structures
,
implementation
1400
x15966
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x15898
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x15840
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15830
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x15798
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15717
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x15542
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15527
1426D
Non-zero Segments
constructive algorithms
,
data structures
,
greedy
,
sortings
1500
x15443
1490F
Equalize the Array
binary search
,
data structures
,
greedy
,
math
,
sortings
1500
x15387
1320A
Journey Planning
data structures
,
dp
,
greedy
,
math
,
sortings
1400
x15351
650A
Watchmen
data structures
,
geometry
,
math
1400
x15021
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x15017
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x15005
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x14960
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x14607
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