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Codeforces Round 950 (Div. 3)
22:33:38
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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
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x5946
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x12027
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19146
1809A
Garland
implementation
800
x23487
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x424
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x655
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1262
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2188
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3608
1808B
Playing in a Casino
math
,
sortings
1200
x14968
1808A
Lucky Numbers
brute force
,
implementation
900
x17439
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17908
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17986
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x5946
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12013
1807D
Odd Queries
data structures
,
implementation
900
x29217
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29360
1807B
Grab the Candies
greedy
800
x40100
1807A
Plus or Minus
implementation
800
x56738
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x273
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x333
1806E
Tree Master
brute force
,
data structures
,
dfs and similar
,
trees
2200
x2706
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x855
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7271
1806B
Mex Master
constructive algorithms
,
greedy
900
x17115
1806A
Walking Master
geometry
,
greedy
,
math
800
x22677
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x330
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x829
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1536
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6109
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12093
1805B
The String Has a Target
greedy
,
strings
800
x18221
1805A
We Need the Zero
bitmasks
,
brute force
800
x21419
1804H
Code Lock
bitmasks
,
dp
3300
x170
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x194
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x858
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1375
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4445
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11606
1804B
Vaccination
greedy
,
implementation
1000
x13838
1804A
Lame King
greedy
,
math
800
x17719
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x12969
1802A
Likes
greedy
,
implementation
800
x15555
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x353
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x550
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x435
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2073
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3251
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5868
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8191
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1949
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3725
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12184
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12243
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21922
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21489
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22518
1800B
Count the Number of Pairs
greedy
,
strings
1000
x24099
1800A
Is It a Cat?
implementation
,
strings
800
x30188
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x273
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x709
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x778
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1164
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2306
1799D1
Hot Start Up (easy version)
dp
1900
x4154
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5512
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10894
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11395
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x471
1798E
Multitest Generator
brute force
,
dp
2300
x1537
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9197
1798C
Candy Store
greedy
,
math
,
number theory
1700
x7856
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15987
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x19398
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x335
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1203
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3730
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7291
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x14752
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x17008
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x170
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x704
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4004
1796C
Maximum Set
binary search
,
math
1600
x9881
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16109
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18604
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x658
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1070
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1942
1795D
Triangle Coloring
combinatorics
,
math
1600
x8570
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11589
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x21287
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23293
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1023
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3386
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12655
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x19913
1794A
Prefix and Suffix Array
strings
800
x16670
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1302
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x941
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