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Codeforces Round 945 (Div. 2)
4 days
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*has extra registration
→ Filter Problems
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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Status
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Custom test
Problems
#
Name
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x19033
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25879
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1128
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3455
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8922
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20004
1921C
Sending Messages
greedy
,
math
900
x27335
1921B
Arranging Cats
greedy
,
implementation
800
x32011
1921A
Square
greedy
,
math
800
x39986
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x404
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x878
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2364
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5097
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11837
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19288
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26496
1919H
Tree Diameter
interactive
,
trees
2000
x128
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x170
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x741
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2028
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x777
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3603
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16845
1919B
Plus-Minus Split
greedy
800
x28815
1919A
Wallet Exchange
games
,
math
800
x31761
1918G
Permutation of Given
constructive algorithms
,
math
2700
x426
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x774
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1556
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4271
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12574
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x22140
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x28765
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x898
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1269
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1658
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9399
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19433
1917A
Least Product
constructive algorithms
,
math
800
x24211
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x502
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x584
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x406
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2101
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x7902
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16686
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23658
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24561
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5435
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x11641
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18537
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x27769
1915C
Can I Square?
binary search
,
implementation
800
x37659
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38640
1915A
Odd One Out
bitmasks
,
implementation
800
x49900
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1226
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1676
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3677
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x11256
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11156
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x18212
1914C
Quests
greedy
,
math
1100
x20776
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x28579
1914A
Problemsolving Log
implementation
,
strings
800
x29780
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x288
1913E
Matrix Problem
flows
,
graphs
2400
x908
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2708
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13678
1913B
Swap and Delete
strings
1000
x21875
1913A
Rating Increase
implementation
800
x22300
1912L
LOL Lovers
strings
800
x6330
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2041
1912J
Joy of Pokémon Observation
2300
x519
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x54
1912H
Hypercatapult Commute
graphs
2400
x373
1912G
Great City Saint Petersburg
data structures
2400
x418
1912F
Fugitive Frenzy
math
,
probabilities
3100
x105
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x774
1912D
Divisibility Test
math
1900
x1314
1912C
Cactus Transformation
constructive algorithms
3300
x45
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x921
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1883
1910J
Two Colors
*special problem
2900
x43
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x40
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x79
1910G
Pool Records
*special problem
,
greedy
2700
x50
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x162
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x174
1910D
Remove and Add
*special problem
,
greedy
1800
x309
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x583
1910B
Security Guard
*special problem
,
greedy
1600
x604
1910A
Username
*special problem
,
implementation
1100
x1603
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x75
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x61
1909G
Pumping Lemma
hashing
,
strings
3000
x319
1909F2
Small Permutation Problem (Hard Version)
combinatorics
,
dp
,
math
2500
x831
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1637
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1248
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x3982
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x9969
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x13919
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