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Codeforces Round 950 (Div. 3)
24:31:39
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Difficulty:
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dp
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
#
Name
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x514
1713C
Build Permutation
constructive algorithms
,
dp
,
math
1200
x16892
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1284
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x537
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x21988
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x146
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x588
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1660
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x14500
1706B
Making Towers
dp
,
greedy
,
math
1100
x16266
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x172
1704F
Colouring Game
constructive algorithms
,
dp
,
games
2600
x940
1704E
Count Seconds
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
2200
x2240
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x10118
1703F
Yet Another Problem About Pairs Satisfying an Inequality
binary search
,
data structures
,
dp
,
greedy
,
sortings
1300
x18473
1701E
Text Editor
brute force
,
dp
,
greedy
,
strings
2500
x1079
1700F
Puzzle
constructive algorithms
,
dp
,
greedy
2600
x855
1700D
River Locks
binary search
,
dp
,
greedy
,
math
1900
x5866
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1097
1699D
Almost Triple Deletions
data structures
,
dp
,
greedy
2300
x3044
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
1695D2
Tree Queries (Hard Version)
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1930
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
x10443
1693D
Decinc Dividing
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
2800
x782
1693B
Fake Plastic Trees
dfs and similar
,
dp
,
greedy
,
trees
1700
x8119
1692H
Gambling
data structures
,
dp
,
greedy
,
math
1700
x7135
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x16215
1691F
K-Set Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2500
x912
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4051
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x10704
1686B
Odd Subarrays
dp
,
greedy
800
x17961
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1567
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x704
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9316
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x3650
1679F
Formalism for Formalism
bitmasks
,
dp
,
math
2600
x503
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1106
1679D
Toss a Coin to Your Graph...
binary search
,
dfs and similar
,
dp
,
graphs
1900
x4594
1678B2
Tokitsukaze and Good 01-String (hard version)
dp
,
greedy
,
implementation
1800
x6415
1677F
Tokitsukaze and Gems
dp
,
math
3500
x88
1677D
Tokitsukaze and Permutations
dp
,
math
2500
x1196
1677A
Tokitsukaze and Strange Inequality
brute force
,
data structures
,
dp
1600
x8153
1676G
White-Black Balanced Subtrees
dfs and similar
,
dp
,
graphs
,
trees
1300
x14392
1675G
Sorting Pancakes
dp
2300
x1612
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x5055
1674G
Remove Directed Edges
dfs and similar
,
dp
,
graphs
2000
x2402
1673C
Palindrome Basis
brute force
,
dp
,
math
,
number theory
1500
x11989
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x318
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2656
1670F
Jee, You See?
bitmasks
,
combinatorics
,
dp
2400
x923
1667E
Centroid Probabilities
combinatorics
,
dp
,
fft
,
math
3000
x629
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x645
1667B
Optimal Partition
data structures
,
dp
2100
x3499
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1295
1666F
Fancy Stack
combinatorics
,
dp
,
implementation
2200
x1114
1663D
Is it rated - 3
*special problem
,
combinatorics
,
dp
,
math
x1390
1662L
Il Derby della Madonnina
data structures
,
dp
,
math
x999
1662G
Gastronomic Event
dp
,
greedy
,
trees
x448
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x291
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x915
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17095
1660C
Get an Even String
dp
,
greedy
,
strings
1300
x18898
1659C
Line Empire
binary search
,
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9818
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x1025
1657E
Star MST
combinatorics
,
dp
,
graph matchings
,
math
2200
x1998
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x71
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2350
1650F
Vitaly and Advanced Useless Algorithms
dp
,
greedy
,
implementation
2200
x1392
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x808
1647F
Madoka and Laziness
dp
,
greedy
3100
x379
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5142
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2310
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3570
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13350
1644C
Increase Subarray Sums
brute force
,
dp
,
greedy
,
implementation
1400
x13431
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1708
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x7414
1637B
MEX and Array
brute force
,
dp
,
greedy
,
math
1100
x14654
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6041
1633D
Make Them Equal
dp
,
greedy
1600
x13186
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12327
1631B
Fun with Even Subarrays
dp
,
greedy
1100
x19447
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1517
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2856
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x1990
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3030
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2255
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x7888
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x715
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10673
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x981
1625C
Road Optimization
dp
1700
x10152
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3976
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x626
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1727
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x863
1620F
Bipartite Array
dp
,
greedy
2800
x590
1620C
BA-String
brute force
,
dp
,
greedy
,
implementation
,
math
1800
x6394
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