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Before contest
Codeforces Round 973 (Div. 2)
02:12:03
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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
538A
Cutting Banner
brute force
,
implementation
1400
x7110
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x385
536D
Tavas in Kansas
dp
,
games
2900
x727
535E
Tavas and Pashmaks
geometry
,
math
2600
x805
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3940
535C
Tavas and Karafs
binary search
,
greedy
,
math
1900
x3772
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x22375
535A
Tavas and Nafas
brute force
,
implementation
1000
x12159
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x470
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x346
534D
Handshakes
binary search
,
constructive algorithms
,
data structures
,
greedy
1900
x2395
534C
Polycarpus' Dice
math
1600
x4993
534B
Covered Path
dp
,
greedy
,
math
1400
x10150
534A
Exam
constructive algorithms
,
implementation
,
math
1100
x12228
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x892
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2255
533D
Landmarks
data structures
,
dp
3000
x231
533C
Board Game
games
,
greedy
,
implementation
,
math
1700
x2187
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2373
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x387
530I
Different variables
*special problem
2500
x47
530H
Points in triangle
*special problem
,
geometry
2100
x123
530G
Levenshtein distance
*special problem
2100
x158
530F
Jumping frogs
*special problem
2100
x101
530E
Sum and product
*special problem
1700
x307
530D
Set subtraction
*special problem
1600
x452
530C
Diophantine equation
*special problem
1500
x552
530B
String inside out
*special problem
1600
x542
530A
Quadratic equation
*special problem
1500
x673
529B
Group Photo 2 (online mirror version)
brute force
,
greedy
,
sortings
1900
x866
528E
Triangles 3000
geometry
,
sortings
3100
x217
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2131
527E
Data Center Drama
dfs and similar
,
graphs
2600
x1977
527D
Clique Problem
data structures
,
dp
,
greedy
,
implementation
,
sortings
1800
x4753
527C
Glass Carving
binary search
,
data structures
,
implementation
1500
x6874
527B
Error Correct System
greedy
1500
x3874
527A
Playing with Paper
implementation
,
math
1100
x14400
526G
Spiders Evil Plan
greedy
,
trees
3300
x724
526F
Pudding Monsters
data structures
,
divide and conquer
3000
x2519
526E
Transmitting Levels
dp
,
implementation
2400
x1070
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2148
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2478
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4491
526A
King of Thieves
brute force
,
implementation
1300
x4759
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x3165
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1758
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5796
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9355
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x14490
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x527
524E
Rooks and Rectangles
data structures
,
sortings
2400
x1189
524D
Social Network
greedy
,
two pointers
2100
x950
524C
The Art of Dealing with ATM
binary search
,
sortings
1900
x2042
524B
Фото на память - 2 (round version)
dp
,
greedy
1700
x1455
524A
Возможно, вы знаете этих людей?
implementation
1600
x1400
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2324
523C
Name Quest
*special problem
,
greedy
1400
x2492
523B
Mean Requests
*special problem
,
implementation
1500
x948
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2624
522D
Closest Equals
*special problem
,
data structures
2000
x3148
522C
Chicken or Fish?
greedy
2100
x717
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8807
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x16230
521E
Cycling City
dfs and similar
,
graphs
3100
x1000
521D
Shop
greedy
2800
x1577
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1868
520D
Cubes
games
,
greedy
,
implementation
2100
x1545
520C
DNA Alignment
math
,
strings
1500
x4138
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x50576
520A
Pangram
implementation
,
strings
800
x96244
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6813
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6359
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19667
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x39023
519A
A and B and Chess
implementation
900
x18944
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x367
518E
Arthur and Questions
greedy
,
implementation
,
math
,
ternary search
2200
x927
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x6942
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x5979
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x7946
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9199
516E
Drazil and His Happy Friends
math
,
number theory
3100
x503
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1308
515E
Drazil and Park
data structures
2300
x2107
515D
Drazil and Tiles
constructive algorithms
,
greedy
2000
x2835
515C
Drazil and Factorial
greedy
,
math
,
sortings
1400
x25833
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7433
515A
Drazil and Date
math
1000
x20156
514E
Darth Vader and Tree
dp
,
matrices
2200
x1422
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4338
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6793
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20709
514A
Chewbaсca and Number
greedy
,
implementation
1200
x51420
513G3
Inversions problem
dp
3100
x263
513G2
Inversions problem
dp
,
probabilities
2400
x652
513G1
Inversions problem
brute force
,
dfs and similar
,
dp
,
meet-in-the-middle
1800
x1779
513F2
Scaygerboss
flows
2800
x353
513F1
Scaygerboss
flows
2700
x321
513E2
Subarray Cuts
dp
2700
x569
513E1
Subarray Cuts
dp
2600
x479
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