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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
35:34:57
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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
567F
Mausoleum
dp
2400
x556
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x556
1383C
String Transformation 2
bitmasks
,
dp
,
graphs
,
trees
3100
x555
37E
Trial for Chief
graphs
,
greedy
,
shortest paths
2600
x555
15E
Triangles
combinatorics
,
dp
2600
x555
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x554
1707E
Replace
binary search
,
data structures
3500
x554
1687D
Cute number
binary search
,
brute force
,
data structures
,
dsu
,
implementation
,
math
2900
x554
1270H
Number of Components
data structures
3300
x554
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x554
44J
Triminoes
constructive algorithms
,
greedy
2000
x554
883J
Renovation
constructive algorithms
,
greedy
,
sortings
2400
x553
424D
Biathlon Track
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
2300
x553
385E
Bear in the Field
math
,
matrices
2300
x553
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x552
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x552
261D
Maxim and Increasing Subsequence
dp
2600
x552
1698F
Equal Reversal
constructive algorithms
,
graphs
,
implementation
,
math
2800
x551
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x551
1001E
Distinguish Bell states
*special problem
1600
x551
607D
Power Tree
data structures
,
trees
2600
x551
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x550
1002A2
Generate superposition of zero state and a basis state
1300
x550
976F
Minimal k-covering
flows
,
graphs
2500
x550
954H
Path Counting
combinatorics
,
dp
2500
x550
293C
Cube Problem
brute force
,
math
,
number theory
2400
x550
1661F
Teleporters
binary search
,
greedy
2600
x549
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x549
1000G
Two-Paths
data structures
,
dp
,
trees
2700
x549
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x549
616F
Expensive Strings
string suffix structures
,
strings
2700
x549
1463F
Max Correct Set
bitmasks
,
dp
,
math
3100
x548
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x548
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x547
933C
A Colourful Prospect
geometry
,
graphs
2700
x547
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x545
316C1
Tidying Up
flows
2200
x545
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x544
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x543
87E
Mogohu-Rea Idol
geometry
2600
x543
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x542
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x542
1428G1
Lucky Numbers (Easy Version)
dp
,
greedy
2900
x542
425E
Sereja and Sets
dp
2500
x542
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x542
216E
Martian Luck
math
,
number theory
2000
x542
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x541
852F
Product transformation
combinatorics
,
math
,
number theory
2200
x541
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x541
513E2
Subarray Cuts
dp
2700
x540
530C
Diophantine equation
*special problem
1500
x539
313E
Ilya and Two Numbers
constructive algorithms
,
data structures
,
dsu
,
greedy
2300
x539
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x538
407D
Largest Submatrix 3
dp
,
hashing
2700
x538
1663E
Are You Safe?
*special problem
,
implementation
x537
1505I
Mysterious language again, seriously?
*special problem
2200
x537
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x537
530B
String inside out
*special problem
1600
x537
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x537
1184B2
The Doctor Meets Vader (Medium)
flows
,
graph matchings
,
graphs
,
shortest paths
,
sortings
2200
x536
351C
Jeff and Brackets
dp
,
matrices
2500
x536
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x536
163C
Conveyor
sortings
,
two pointers
2100
x535
491B
New York Hotel
greedy
,
math
2100
x534
100B
Friendly Numbers
*special problem
,
implementation
1500
x534
1444D
Rectangular Polyline
constructive algorithms
,
dp
,
geometry
2900
x533
241G
Challenging Balloons
constructive algorithms
1900
x533
173E
Camping Groups
data structures
,
sortings
2600
x532
1070I
Privatization of Roads in Berland
flows
,
graph matchings
,
graphs
2400
x531
1001G
Oracle for f(x) = k-th element of x
*special problem
1400
x531
1001F
Distinguish multi-qubit basis states
*special problem
1300
x531
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x530
627E
Orchestra
two pointers
3000
x529
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x529
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x528
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x527
1366G
Construct the String
data structures
,
dp
,
strings
2700
x527
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x527
578F
Mirror Box
matrices
,
trees
3200
x527
1461F
Mathematical Expression
constructive algorithms
,
dp
,
greedy
2700
x526
802C
Heidi and Library (hard)
flows
2600
x526
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x526
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x525
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x525
380B
Sereja and Tree
graphs
,
implementation
2400
x525
316D3
PE Lesson
dp
,
math
2400
x525
1028G
Guess the number
dp
,
interactive
3000
x524
1001H
Oracle for f(x) = parity of the number of 1s in x
*special problem
1200
x524
321D
Ciel and Flipboard
dp
,
greedy
,
math
2900
x524
78E
Evacuation
flows
,
graphs
,
shortest paths
2300
x524
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x523
1488B
RBS Deletion
*special problem
,
greedy
1800
x523
1060F
Shrinking Tree
combinatorics
,
dp
2900
x523
183A
Headquarters
constructive algorithms
,
math
1700
x523
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x522
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x522
180A
Defragmentation
implementation
1800
x522
45E
Director
constructive algorithms
,
greedy
2000
x522
1225G
To Make 1
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
number theory
3100
x521
856C
Eleventh Birthday
combinatorics
,
dp
,
math
2400
x521
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