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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
34:53:37
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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
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x26313
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x6701
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x14461
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x23020
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x30988
1915C
Can I Square?
binary search
,
implementation
800
x44350
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x43333
1915A
Odd One Out
bitmasks
,
implementation
800
x60139
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1432
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1948
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x4234
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x12791
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x12567
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x22985
1914C
Quests
greedy
,
math
1100
x25277
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x30884
1914A
Problemsolving Log
implementation
,
strings
800
x32302
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x334
1913E
Matrix Problem
flows
,
graphs
2400
x1067
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x3294
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x15349
1913B
Swap and Delete
strings
1000
x28713
1913A
Rating Increase
implementation
800
x25471
1912L
LOL Lovers
strings
800
x7269
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2658
1912J
Joy of Pokémon Observation
2300
x617
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x57
1912H
Hypercatapult Commute
graphs
2400
x467
1912G
Great City Saint Petersburg
data structures
2400
x495
1912F
Fugitive Frenzy
math
,
probabilities
3100
x117
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x987
1912D
Divisibility Test
math
1900
x1588
1912C
Cactus Transformation
constructive algorithms
3300
x56
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x1150
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x2228
1910J
Two Colors
*special problem
2900
x49
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x51
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x94
1910G
Pool Records
*special problem
,
greedy
2700
x64
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x181
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x208
1910D
Remove and Add
*special problem
,
greedy
1800
x365
1910C
Poisonous Swamp
*special problem
,
*special problem
,
implementation
,
implementation
1600
x652
1910B
Security Guard
*special problem
,
greedy
1600
x688
1910A
Username
*special problem
,
implementation
1100
x1812
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x122
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x81
1909G
Pumping Lemma
hashing
,
strings
3000
x419
1909F2
Small Permutation Problem (Hard Version)
combinatorics
,
dp
,
math
2500
x974
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1886
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1431
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x4538
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x11475
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x18024
1909A
Distinct Buttons
implementation
,
math
800
x18090
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1995
1907F
Shift and Reverse
greedy
,
sortings
1800
x5047
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x10744
1907D
Jumping Through Segments
binary search
,
constructive algorithms
1400
x15017
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x20621
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x26315
1907A
Rook
implementation
800
x37386
1906M
Triangle Construction
greedy
,
math
1700
x2832
1906L
Palindromic Parentheses
constructive algorithms
2500
x589
1906K
Deck-Building Game
divide and conquer
,
math
2500
x330
1906J
Count BFS Graph
combinatorics
,
dp
2100
x845
1906I
Contingency Plan 2
graph matchings
2900
x163
1906H
Twin Friends
combinatorics
,
dp
2200
x800
1906G
Grid Game 2
games
,
number theory
2900
x218
1906F
Maximize The Value
data structures
,
sortings
2100
x1241
1906E
Merge Not Sort
constructive algorithms
,
dp
1900
x1660
1906D
Spaceship Exploration
binary search
,
geometry
2800
x129
1906C
Cursed Game
interactive
3000
x198
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x617
1906A
Easy As ABC
brute force
1000
x4619
1905F
Field Should Not Be Empty
brute force
,
data structures
,
divide and conquer
2600
x564
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x1030
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3961
1905C
Largest Subsequence
greedy
,
strings
1400
x12601
1905B
Begginer's Zelda
greedy
,
trees
1100
x16731
1905A
Constructive Problems
constructive algorithms
,
math
800
x23204
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x387
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x1047
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x4578
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x7013
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x13985
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x16222
1904A
Forked!
brute force
,
implementation
900
x21302
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x668
1903E
Geo Game
greedy
,
interactive
,
math
2000
x2092
1903D2
Maximum And Queries (hard version)
bitmasks
,
divide and conquer
,
dp
,
greedy
2500
x802
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5922
1903C
Theofanis' Nightmare
constructive algorithms
,
greedy
1400
x12334
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x13088
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x35282
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x1064
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x4440
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x4247
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x14165
1902B
Getting Points
binary search
,
brute force
,
greedy
1100
x14745
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