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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
02:04:10
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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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Custom test
Problems
#
Name
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2281
533D
Landmarks
data structures
,
dp
3000
x235
533C
Board Game
games
,
greedy
,
implementation
,
math
1700
x2211
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2452
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x399
530I
Different variables
*special problem
2500
x47
530H
Points in triangle
*special problem
,
geometry
2100
x123
530G
Levenshtein distance
*special problem
2100
x159
530F
Jumping frogs
*special problem
2100
x107
530E
Sum and product
*special problem
1700
x308
530D
Set subtraction
*special problem
1600
x452
530C
Diophantine equation
*special problem
1500
x556
530B
String inside out
*special problem
1600
x542
530A
Quadratic equation
*special problem
1500
x676
529B
Group Photo 2 (online mirror version)
brute force
,
greedy
,
sortings
1900
x878
528E
Triangles 3000
geometry
,
sortings
3100
x220
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2260
527E
Data Center Drama
dfs and similar
,
graphs
2600
x2012
527D
Clique Problem
data structures
,
dp
,
greedy
,
implementation
,
sortings
1800
x4816
527C
Glass Carving
binary search
,
data structures
,
implementation
1500
x6970
527B
Error Correct System
greedy
1500
x3894
527A
Playing with Paper
implementation
,
math
1100
x14533
526G
Spiders Evil Plan
greedy
,
trees
3300
x758
526F
Pudding Monsters
data structures
,
divide and conquer
3000
x2630
526E
Transmitting Levels
dp
,
implementation
2400
x1094
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2188
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2537
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4515
526A
King of Thieves
brute force
,
implementation
1300
x4797
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x3371
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1802
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5833
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9477
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x14947
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x538
524E
Rooks and Rectangles
data structures
,
sortings
2400
x1217
524D
Social Network
greedy
,
two pointers
2100
x956
524C
The Art of Dealing with ATM
binary search
,
sortings
1900
x2060
524B
Фото на память - 2 (round version)
dp
,
greedy
1700
x1468
524A
Возможно, вы знаете этих людей?
implementation
1600
x1416
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2356
523C
Name Quest
*special problem
,
greedy
1400
x2508
523B
Mean Requests
*special problem
,
implementation
1500
x952
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2643
522D
Closest Equals
*special problem
,
data structures
2000
x3270
522C
Chicken or Fish?
greedy
2100
x723
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x9004
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x16658
521E
Cycling City
dfs and similar
,
graphs
3100
x1075
521D
Shop
greedy
2800
x1625
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1891
520D
Cubes
games
,
greedy
,
implementation
2100
x1569
520C
DNA Alignment
math
,
strings
1500
x4179
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x52154
520A
Pangram
implementation
,
strings
800
x101174
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x7045
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6413
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19855
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x39997
519A
A and B and Chess
implementation
900
x19124
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x384
518E
Arthur and Questions
greedy
,
implementation
,
math
,
ternary search
2200
x1005
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x7100
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x6059
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x8009
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9253
516E
Drazil and His Happy Friends
math
,
number theory
3100
x508
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1331
515E
Drazil and Park
data structures
2300
x2163
515D
Drazil and Tiles
constructive algorithms
,
greedy
2000
x2871
515C
Drazil and Factorial
greedy
,
math
,
sortings
1400
x26290
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7483
515A
Drazil and Date
math
1000
x20474
514E
Darth Vader and Tree
dp
,
matrices
2200
x1456
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4530
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x7013
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x21019
514A
Chewbaсca and Number
greedy
,
implementation
1200
x54494
513G3
Inversions problem
dp
3100
x266
513G2
Inversions problem
dp
,
probabilities
2400
x663
513G1
Inversions problem
brute force
,
dfs and similar
,
dp
,
meet-in-the-middle
1800
x1795
513F2
Scaygerboss
flows
2800
x361
513F1
Scaygerboss
flows
2700
x327
513E2
Subarray Cuts
dp
2700
x600
513E1
Subarray Cuts
dp
2600
x499
513D2
Constrained Tree
constructive algorithms
,
data structures
2600
x385
513D1
Constrained Tree
dfs and similar
2400
x621
513C
Second price auction
bitmasks
,
probabilities
2000
x1564
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2803
513B1
Permutations
brute force
1400
x3711
513A
Game
constructive algorithms
,
math
800
x20642
512E
Fox And Polygon
constructive algorithms
,
divide and conquer
2900
x522
512D
Fox And Travelling
dp
,
trees
2900
x986
510E
Fox And Dinner
flows
2300
x2239
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5717
510C
Fox And Names
dfs and similar
,
graphs
,
sortings
1600
x16721
510B
Fox And Two Dots
dfs and similar
1500
x14183
510A
Fox And Snake
implementation
800
x86326
509F
Progress Monitoring
dp
,
trees
2300
x1086
509E
Pretty Song
math
,
strings
2000
x1805
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