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Before contest
Codeforces Round 950 (Div. 3)
26:10:18
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Difficulty:
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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
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x7649
1968E
Cells Arrangement
constructive algorithms
1600
x8526
1958D
Staircase
*special problem
1600
x366
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x8112
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x11188
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x9432
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8406
1938H
Pho Restaurant
1600
x1901
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7054
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7680
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x9042
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x12047
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9534
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x594
1910B
Security Guard
*special problem
,
greedy
1600
x612
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x9006
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x5852
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6836
1886C
Decreasing String
implementation
,
strings
1600
x10417
1878D
Reverse Madness
data structures
,
greedy
1600
x7689
1875D
Jellyfish and Mex
dp
1600
x7729
1862E
Kolya and Movie Theatre
constructive algorithms
,
data structures
,
greedy
1600
x9756
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9577
1857F
Sum and Product
binary search
,
data structures
,
math
1600
x10548
1856C
To Become Max
binary search
,
brute force
,
data structures
,
dp
1600
x11231
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9944
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11221
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7615
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10598
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9555
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x9815
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7109
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7271
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8190
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9195
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7291
1796C
Maximum Set
binary search
,
math
1600
x9881
1795D
Triangle Coloring
combinatorics
,
math
1600
x8568
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x6765
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7142
1779C
Least Prefix Sum
data structures
,
greedy
1600
x11924
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7747
1775C
Interesting Sequence
bitmasks
,
math
1600
x9770
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7477
1771C
Hossam and Trainees
greedy
,
math
,
number theory
1600
x9136
1766D
Lucky Chains
math
,
number theory
1600
x8490
1753B
Factorial Divisibility
math
,
number theory
1600
x12185
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10568
1741E
Sending a Sequence Over the Network
dp
1600
x11023
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x11994
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10177
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x8784
1707A
Doremy's IQ
binary search
,
constructive algorithms
,
greedy
,
implementation
1600
x12959
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x10118
1702E
Split Into Two Sets
dfs and similar
,
dsu
,
graphs
1600
x12492
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x8764
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x10704
1687A
The Enchanted Forest
brute force
,
greedy
1600
x10039
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9567
1677A
Tokitsukaze and Strange Inequality
brute force
,
data structures
,
dp
1600
x8153
1671D
Insert a Progression
brute force
,
constructive algorithms
,
greedy
1600
x7361
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x8085
1660E
Matrix and Shifts
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x7023
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8237
1658D1
388535 (Easy Version)
bitmasks
,
math
1600
x8811
1633D
Make Them Equal
dp
,
greedy
1600
x13184
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12326
1623C
Balanced Stone Heaps
binary search
,
greedy
1600
x11425
1622C
Set or Decrease
binary search
,
brute force
,
greedy
,
sortings
1600
x12477
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8088
1612D
X-Magic Pair
math
,
number theory
1600
x8874
1610C
Keshi Is Throwing a Party
binary search
,
greedy
1600
x10827
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x7028
1607E
Robot on the Board 1
implementation
1600
x9064
1603B
Moderate Modular Mode
constructive algorithms
,
math
,
number theory
1600
x13127
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x11782
1582D
Vupsen, Pupsen and 0
constructive algorithms
,
math
1600
x10186
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11883
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7711
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x11830
1542C
Strange Function
math
,
number theory
1600
x13616
1539D
PriceFixed
binary search
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x11332
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12359
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x8934
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x14011
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13174
1526C2
Potions (Hard Version)
data structures
,
greedy
1600
x21240
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8613
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x11024
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14659
1514C
Product 1 Modulo N
greedy
,
number theory
1600
x14417
1513C
Add One
dp
,
matrices
1600
x13333
1512E
Permutation by Sum
brute force
,
greedy
,
math
1600
x10070
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11095
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x6019
1503A
Balance the Bits
constructive algorithms
,
greedy
1600
x13048
1498C
Planar Reflections
brute force
,
data structures
,
dp
1600
x9281
1497C2
k-LCM (hard version)
constructive algorithms
,
math
1600
x16557
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x11710
1482C
Basic Diplomacy
brute force
,
constructive algorithms
,
greedy
,
implementation
1600
x9116
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