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Before contest
Codeforces Round (Div. 3)
7 days
→ Filter Problems
Difficulty:
—
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
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Status
Standings
Custom test
Problems
#
Name
540B
School Marks
greedy
,
implementation
1700
x4613
540A
Combination Lock
implementation
800
x31797
538H
Summer Dichotomy
2-sat
,
data structures
,
dfs and similar
,
greedy
3200
x631
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x444
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1550
538E
Demiurges Play Again
dfs and similar
,
dp
,
math
,
trees
2200
x1505
538D
Weird Chess
brute force
,
constructive algorithms
,
implementation
1800
x2407
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5769
538B
Quasi Binary
constructive algorithms
,
dp
,
greedy
,
implementation
1400
x17697
538A
Cutting Banner
brute force
,
implementation
1400
x7084
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x376
536D
Tavas in Kansas
dp
,
games
2900
x712
535E
Tavas and Pashmaks
geometry
,
math
2600
x799
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3806
535C
Tavas and Karafs
binary search
,
greedy
,
math
1900
x3713
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21850
535A
Tavas and Nafas
brute force
,
implementation
1000
x11947
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x445
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x344
534D
Handshakes
binary search
,
constructive algorithms
,
data structures
,
greedy
1900
x2380
534C
Polycarpus' Dice
math
1600
x4941
534B
Covered Path
dp
,
greedy
,
math
1400
x9968
534A
Exam
constructive algorithms
,
implementation
,
math
1100
x12103
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x869
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2230
533D
Landmarks
data structures
,
dp
3000
x218
533C
Board Game
games
,
greedy
,
implementation
,
math
1700
x2166
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2325
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x377
530I
Different variables
*special problem
2500
x44
530H
Points in triangle
*special problem
,
geometry
2100
x120
530G
Levenshtein distance
*special problem
2100
x149
530F
Jumping frogs
*special problem
2100
x98
530E
Sum and product
*special problem
1700
x303
530D
Set subtraction
*special problem
1600
x448
530C
Diophantine equation
*special problem
1500
x543
530B
String inside out
*special problem
1600
x539
530A
Quadratic equation
*special problem
1500
x669
529B
Group Photo 2 (online mirror version)
brute force
,
greedy
,
sortings
1900
x854
528E
Triangles 3000
geometry
,
sortings
3100
x215
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2091
527E
Data Center Drama
dfs and similar
,
graphs
2600
x1821
527D
Clique Problem
data structures
,
dp
,
greedy
,
implementation
,
sortings
1800
x4667
527C
Glass Carving
binary search
,
data structures
,
implementation
1500
x6695
527B
Error Correct System
greedy
1500
x3857
527A
Playing with Paper
implementation
,
math
1100
x14204
526G
Spiders Evil Plan
greedy
,
trees
3300
x694
526F
Pudding Monsters
data structures
,
divide and conquer
3000
x2352
526E
Transmitting Levels
dp
,
implementation
2400
x1060
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2105
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2279
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4474
526A
King of Thieves
brute force
,
implementation
1300
x4728
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2842
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1650
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5712
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9225
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x14039
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x523
524E
Rooks and Rectangles
data structures
,
sortings
2400
x1171
524D
Social Network
greedy
,
two pointers
2100
x947
524C
The Art of Dealing with ATM
binary search
,
sortings
1900
x2023
524B
Фото на память - 2 (round version)
dp
,
greedy
1700
x1447
524A
Возможно, вы знаете этих людей?
implementation
1600
x1395
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2258
523C
Name Quest
*special problem
,
greedy
1400
x2469
523B
Mean Requests
*special problem
,
implementation
1500
x943
523A
Rotate, Flip and Zoom
*special problem
,
implementation
1200
x2596
522D
Closest Equals
*special problem
,
data structures
2000
x2989
522C
Chicken or Fish?
greedy
2100
x713
522B
Photo to Remember
*special problem
,
data structures
,
dp
,
implementation
1100
x8729
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15825
521E
Cycling City
dfs and similar
,
graphs
3100
x922
521D
Shop
greedy
2800
x1500
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1815
520D
Cubes
games
,
greedy
,
implementation
2100
x1535
520C
DNA Alignment
math
,
strings
1500
x4099
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x48627
520A
Pangram
implementation
,
strings
800
x91353
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6363
519D
A and B and Interesting Substrings
data structures
,
dp
,
two pointers
1800
x6291
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19396
519B
A and B and Compilation Errors
data structures
,
implementation
,
sortings
1100
x38166
519A
A and B and Chess
implementation
900
x18689
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x355
518E
Arthur and Questions
greedy
,
implementation
,
math
,
ternary search
2200
x911
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x6748
518C
Anya and Smartphone
constructive algorithms
,
data structures
,
implementation
1600
x5940
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x7839
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9138
516E
Drazil and His Happy Friends
math
,
number theory
3100
x477
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1233
515E
Drazil and Park
data structures
2300
x2067
515D
Drazil and Tiles
constructive algorithms
,
greedy
2000
x2769
515C
Drazil and Factorial
greedy
,
math
,
sortings
1400
x25161
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7374
515A
Drazil and Date
math
1000
x19698
514E
Darth Vader and Tree
dp
,
matrices
2200
x1387
514D
R2D2 and Droid Army
binary search
,
data structures
,
two pointers
2000
x4165
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6568
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