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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
56A
Bar
implementation
1000
x8580
55E
Very simple problem
geometry
,
two pointers
2500
x698
55D
Beautiful numbers
dp
,
number theory
2500
x3840
55C
Pie or die
games
1900
x1623
55B
Smallest number
brute force
1600
x2825
55A
Flea travel
implementation
,
math
1200
x3390
54E
Vacuum Сleaner
geometry
2700
x190
54D
Writing a Song
brute force
,
dp
,
strings
2100
x534
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1294
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x755
54A
Presents
implementation
1300
x2059
53E
Dead Ends
bitmasks
,
dp
2500
x966
53D
Physical Education
sortings
1500
x1992
53C
Little Frog
constructive algorithms
1200
x6402
53B
Blog Photo
binary search
,
implementation
1700
x1397
53A
Autocomplete
implementation
1100
x4998
52C
Circular RMQ
data structures
2200
x8787
52B
Right Triangles
combinatorics
1600
x2024
52A
123-sequence
implementation
900
x8583
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x562
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x402
51D
Geometrical problem
implementation
2200
x477
51C
Three Base Stations
binary search
,
greedy
1800
x1917
51B
bHTML Tables Analisys
expression parsing
1700
x867
51A
Cheaterius's Problem
implementation
1300
x1811
50E
Square Equation Roots
math
2300
x353
50D
Bombing
binary search
,
dp
,
probabilities
2100
x616
50C
Happy Farm 5
geometry
2000
x758
50B
Choosing Symbol Pairs
strings
1500
x5647
50A
Domino piling
greedy
,
math
800
x241579
49E
Common ancestor
dp
2300
x659
49D
Game
brute force
,
dp
,
implementation
1800
x1889
49C
Disposition
constructive algorithms
,
math
1700
x1679
49B
Sum
math
1500
x2457
49A
Sleuth
implementation
800
x13257
48H
Black and White
constructive algorithms
2800
x143
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x257
48F
Snow sellers
greedy
,
sortings
2800
x154
48E
Ivan the Fool VS Gorynych the Dragon
dp
,
games
,
graphs
2100
x577
48D
Permutations
greedy
1500
x2488
48C
The Race
math
1800
x774
48B
Land Lot
brute force
,
implementation
1200
x2651
48A
Rock-paper-scissors
implementation
,
schedules
900
x6044
47E
Cannon
data structures
,
geometry
,
sortings
2200
x363
47D
Safe
brute force
2200
x764
47C
Crossword
implementation
2000
x776
47B
Coins
implementation
1200
x13783
47A
Triangular numbers
brute force
,
math
800
x14907
46G
Emperor's Problem
geometry
2500
x114
46F
Hercule Poirot Problem
dsu
,
graphs
2300
x323
46E
Comb
data structures
,
dp
1900
x952
46D
Parking Lot
data structures
,
implementation
1800
x972
46C
Hamsters and Tigers
two pointers
1600
x2407
46B
T-shirts from Sponsor
implementation
1100
x3639
46A
Ball Game
brute force
,
implementation
800
x8632
45J
Planting Trees
constructive algorithms
1800
x931
45I
TCMCF+++
greedy
1400
x2374
45H
Road Problem
graphs
2100
x184
45G
Prime Problem
number theory
2200
x1031
45F
Goats and Wolves
greedy
2500
x131
45E
Director
constructive algorithms
,
greedy
2000
x538
45D
Event Dates
greedy
,
meet-in-the-middle
,
sortings
1900
x1676
45C
Dancing Lessons
data structures
1900
x887
45B
School
dp
,
dsu
2200
x274
45A
Codecraft III
implementation
900
x6639
44J
Triminoes
constructive algorithms
,
greedy
2000
x566
44I
Toys
brute force
,
combinatorics
2300
x188
44H
Phone Number
dp
1700
x1722
44G
Shooting Gallery
data structures
,
implementation
2500
x402
44F
BerPaint
geometry
,
graphs
2700
x66
44E
Anfisa the Monkey
dp
1400
x5035
44D
Hyperdrive
math
1800
x707
44C
Holidays
implementation
1300
x3324
44B
Cola
implementation
1500
x1960
44A
Indian Summer
implementation
900
x10488
43E
Race
brute force
,
implementation
,
two pointers
2300
x392
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1075
43C
Lucky Tickets
greedy
1300
x4249
43B
Letter
implementation
,
strings
1100
x16587
43A
Football
strings
1000
x55512
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x201
42D
Strange town
constructive algorithms
,
math
2300
x401
42C
Safe cracking
brute force
,
constructive algorithms
2200
x480
42B
Game of chess unfinished
implementation
1700
x938
42A
Guilty --- to the kitchen!
greedy
,
implementation
1400
x2820
41E
3-cycles
constructive algorithms
,
graphs
,
greedy
1900
x1943
41D
Pawn
dp
1900
x2340
41C
Email address
expression parsing
,
implementation
1300
x3734
41B
Martian Dollar
brute force
1400
x3981
41A
Translation
implementation
,
strings
800
x142935
40E
Number Table
combinatorics
2500
x668
40D
Interesting Sequence
math
2600
x132
40C
Berland Square
implementation
,
math
2300
x247
40B
Repaintings
math
1600
x1155
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x3976
39K
Testing
2600
x84
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2939
39I
Tram
2500
x138
39H
Multiplication Table
implementation
1300
x2706
39G
Inverse Function
implementation
2400
x126
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