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Codeforces Round 950 (Div. 3)
29:00:35
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Difficulty:
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brute force
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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Name
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6333
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x14039
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1744
1761A
Two Permutations
brute force
,
constructive algorithms
800
x17440
1759E
The Humanoid
brute force
,
dp
,
sortings
1500
x10097
1759D
Make It Round
brute force
,
number theory
1400
x12456
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6943
1753F
Minecraft Series
brute force
,
two pointers
3500
x194
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x310
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x16001
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10567
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x14425
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5324
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x10313
1743D
Problem with Random Tests
brute force
,
dp
,
greedy
,
probabilities
1700
x7358
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x26230
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x10015
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x22011
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1437
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17315
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1817
1736A
Make A Equal to B
brute force
,
greedy
,
sortings
800
x22480
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5329
1734A
Select Three Sticks
brute force
,
greedy
,
sortings
800
x20827
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1371
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8331
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2474
1732B
Ugu
brute force
,
dp
,
greedy
,
implementation
900
x14286
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14502
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x663
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6803
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x9048
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x429
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1663
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x24398
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3563
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10177
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x372
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5763
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20807
1716D
Chip Move
brute force
,
dp
,
math
2000
x5022
1714E
Add Modulo 10
brute force
,
math
,
number theory
1400
x15486
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x8784
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1185
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2052
1711B
Party
brute force
,
graphs
1300
x13161
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1284
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2367
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x537
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x29141
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x5567
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1660
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x6720
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1983
1705C
Mark and His Unfinished Essay
brute force
,
implementation
1400
x13041
1704E
Count Seconds
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
2200
x2240
1704B
Luke is a Foodie
brute force
,
greedy
,
implementation
1000
x16588
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x10116
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x24577
1703C
Cypher
brute force
,
implementation
,
strings
800
x34372
1703A
YES or YES?
brute force
,
implementation
,
strings
800
x63756
1701E
Text Editor
brute force
,
dp
,
greedy
,
strings
2500
x1077
1700E
Serega the Pirate
brute force
,
constructive algorithms
2600
x830
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1584
1698C
3SUM Closure
brute force
,
data structures
1300
x18001
1698A
XOR Mixup
bitmasks
,
brute force
800
x28016
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1145
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x155
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x266
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x851
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2100
1695C
Zero Path
brute force
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x10441
1693D
Decinc Dividing
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
2800
x782
1692F
3SUM
brute force
,
math
1300
x21549
1692D
The Clock
brute force
,
implementation
1100
x18830
1691C
Sum of Substrings
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1400
x15179
1691A
Beat The Odds
brute force
,
greedy
,
math
800
x29971
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1156
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16409
1688A
Cirno's Perfect Bitmasks Classroom
bitmasks
,
brute force
800
x20935
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x559
1687C
Sanae and Giant Robot
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2500
x1345
1687A
The Enchanted Forest
brute force
,
greedy
1600
x10037
1685C
Bring Balance
brute force
,
constructive algorithms
,
greedy
2600
x934
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3062
1684C
Column Swapping
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x12070
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9316
1680D
Dog Walking
brute force
,
greedy
,
math
2400
x1124
1680A
Minimums and Maximums
brute force
,
math
800
x21053
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x22228
1677A
Tokitsukaze and Strange Inequality
brute force
,
data structures
,
dp
1600
x8153
1676H1
Maximum Crossings (Easy Version)
brute force
1400
x13399
1676D
X-Sum
brute force
,
greedy
,
implementation
1000
x24195
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x28989
1674E
Breaking the Wall
binary search
,
brute force
,
constructive algorithms
,
greedy
,
math
2000
x6199
1673C
Palindrome Basis
brute force
,
dp
,
math
,
number theory
1500
x11988
1673B
A Perfectly Balanced String?
brute force
,
greedy
,
strings
1100
x14410
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x318
1671D
Insert a Progression
brute force
,
constructive algorithms
,
greedy
1600
x7361
1671C
Dolce Vita
binary search
,
brute force
,
greedy
,
math
1200
x16096
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