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Before contest
Codeforces Round (Div. 2)
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
549B
Looksery Party
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2300
x1499
549A
Face Detection
implementation
,
strings
900
x9454
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8424
548A
Mike and Fax
brute force
,
implementation
,
strings
1100
x9993
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x2092
547D
Mike and Fish
constructive algorithms
,
dfs and similar
,
graphs
2600
x2588
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2846
547B
Mike and Feet
binary search
,
data structures
,
dp
,
dsu
1900
x8656
547A
Mike and Frog
brute force
,
greedy
,
implementation
,
math
2200
x2542
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x3603
546D
Soldier and Number Game
constructive algorithms
,
dp
,
math
,
number theory
1700
x11780
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x17546
546B
Soldier and Badges
brute force
,
greedy
,
implementation
,
sortings
1200
x17530
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x180623
545E
Paths and Trees
graphs
,
greedy
,
shortest paths
2000
x4623
545D
Queue
greedy
,
implementation
,
sortings
1300
x25062
545C
Woodcutters
dp
,
greedy
1500
x27753
545B
Equidistant String
greedy
1100
x11608
545A
Toy Cars
implementation
900
x11583
544B
Sea and Islands
constructive algorithms
,
implementation
1400
x8006
544A
Set of Strings
implementation
,
strings
1100
x8218
543E
Listening to Music
constructive algorithms
,
data structures
3200
x288
543D
Road Improvement
dp
,
trees
2300
x2704
543C
Remembering Strings
bitmasks
,
dp
2500
x1383
543B
Destroying Roads
constructive algorithms
,
graphs
,
shortest paths
2100
x4104
543A
Writing Code
dp
1800
x7951
542F
Quest
dp
,
greedy
2100
x924
542E
Playing on Graph
graphs
,
shortest paths
2600
x855
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x511
542C
Idempotent functions
constructive algorithms
,
graphs
,
math
2000
x1130
542B
Duck Hunt
data structures
3100
x204
542A
Place Your Ad Here
data structures
,
sortings
2400
x571
540E
Infinite Inversions
binary search
,
data structures
,
implementation
,
sortings
,
trees
2100
x2111
540D
Bad Luck Island
dp
,
probabilities
1900
x5461
540C
Ice Cave
dfs and similar
2000
x7287
540B
School Marks
greedy
,
implementation
1700
x4702
540A
Combination Lock
implementation
800
x32423
538H
Summer Dichotomy
2-sat
,
data structures
,
dfs and similar
,
greedy
3200
x655
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x458
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1725
538E
Demiurges Play Again
dfs and similar
,
dp
,
math
,
trees
2200
x1539
538D
Weird Chess
brute force
,
constructive algorithms
,
implementation
1800
x2427
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5811
538B
Quasi Binary
constructive algorithms
,
dp
,
greedy
,
implementation
1400
x18021
538A
Cutting Banner
brute force
,
implementation
1400
x7134
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x386
536D
Tavas in Kansas
dp
,
games
2900
x729
535E
Tavas and Pashmaks
geometry
,
math
2600
x806
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3951
535C
Tavas and Karafs
binary search
,
greedy
,
math
1900
x3779
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x22457
535A
Tavas and Nafas
brute force
,
implementation
1000
x12181
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x470
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x350
534D
Handshakes
binary search
,
constructive algorithms
,
data structures
,
greedy
1900
x2406
534C
Polycarpus' Dice
math
1600
x5012
534B
Covered Path
dp
,
greedy
,
math
1400
x10245
534A
Exam
constructive algorithms
,
implementation
,
math
1100
x12276
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x895
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2258
533D
Landmarks
data structures
,
dp
3000
x235
533C
Board Game
games
,
greedy
,
implementation
,
math
1700
x2193
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2385
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x389
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
x555
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
x871
528E
Triangles 3000
geometry
,
sortings
3100
x218
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2230
527E
Data Center Drama
dfs and similar
,
graphs
2600
x1991
527D
Clique Problem
data structures
,
dp
,
greedy
,
implementation
,
sortings
1800
x4771
527C
Glass Carving
binary search
,
data structures
,
implementation
1500
x6894
527B
Error Correct System
greedy
1500
x3879
527A
Playing with Paper
implementation
,
math
1100
x14430
526G
Spiders Evil Plan
greedy
,
trees
3300
x727
526F
Pudding Monsters
data structures
,
divide and conquer
3000
x2529
526E
Transmitting Levels
dp
,
implementation
2400
x1070
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2154
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2483
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4497
526A
King of Thieves
brute force
,
implementation
1300
x4763
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x3194
525D
Arthur and Walls
constructive algorithms
,
data structures
,
graphs
,
greedy
,
shortest paths
2400
x1762
525C
Ilya and Sticks
greedy
,
math
,
sortings
1600
x5809
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9369
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x14541
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x533
524E
Rooks and Rectangles
data structures
,
sortings
2400
x1193
524D
Social Network
greedy
,
two pointers
2100
x954
524C
The Art of Dealing with ATM
binary search
,
sortings
1900
x2048
524B
Фото на память - 2 (round version)
dp
,
greedy
1700
x1459
524A
Возможно, вы знаете этих людей?
implementation
1600
x1412
523D
Statistics of Recompressing Videos
*special problem
,
data structures
,
implementation
1600
x2330
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