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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
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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Problems
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Status
Standings
Custom test
Problems
#
Name
213B
Numbers
combinatorics
,
dp
1900
x1771
213A
Game
dfs and similar
,
greedy
1700
x1723
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1738
212D
Cutting a Fence
binary search
,
data structures
,
dsu
2500
x510
212C
Cowboys
combinatorics
,
dp
,
math
2100
x387
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x332
212A
Privatization
flows
,
graphs
3000
x203
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x732
209B
Pixels
constructive algorithms
,
math
2100
x375
209A
Multicolored Marbles
dp
,
math
1600
x2343
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6638
208D
Prizes, Prizes, more Prizes
implementation
1200
x7587
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1848
208B
Solitaire
dfs and similar
,
dp
1900
x1357
208A
Dubstep
strings
900
x88087
207D9
The Beaver's Problem - 3
1800
x88
207D8
The Beaver's Problem - 3
2300
x95
207D7
The Beaver's Problem - 3
1600
x101
207D6
The Beaver's Problem - 3
2100
x84
207D5
The Beaver's Problem - 3
1600
x142
207D4
The Beaver's Problem - 3
2100
x154
207D3
The Beaver's Problem - 3
2000
x136
207D2
The Beaver's Problem - 3
2000
x109
207D10
The Beaver's Problem - 3
2100
x82
207D1
The Beaver's Problem - 3
1800
x117
207C3
Game with Two Trees
data structures
2700
x132
207C2
Game with Two Trees
2200
x84
207C1
Game with Two Trees
2100
x107
207B3
Military Trainings
1700
x163
207B2
Military Trainings
1900
x181
207B1
Military Trainings
1600
x266
207A3
Beaver's Calculator 1.0
greedy
2000
x214
207A2
Beaver's Calculator 1.0
greedy
1800
x236
207A1
Beaver's Calculator 1.0
greedy
1600
x286
205B
Little Elephant and Sorting
brute force
,
greedy
1400
x6031
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x22338
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1159
204D
Little Elephant and Retro Strings
dp
2400
x581
204C
Little Elephant and Furik and Rubik
math
,
probabilities
2000
x1099
204B
Little Elephant and Cards
binary search
,
data structures
1500
x5198
204A
Little Elephant and Interval
binary search
,
combinatorics
,
dp
1500
x5696
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x280
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1418
203C
Photographer
greedy
,
sortings
1400
x5678
203B
Game on Paper
brute force
,
implementation
1300
x2592
203A
Two Problems
brute force
,
implementation
1200
x4177
202B
Brand New Easy Problem
brute force
1700
x817
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x16742
201E
Thoroughly Bureaucratic Organization
binary search
,
combinatorics
2600
x415
201D
Brand New Problem
bitmasks
,
brute force
,
dp
2600
x415
201C
Fragile Bridges
dp
2000
x1357
201B
Guess That Car!
math
,
ternary search
1800
x1265
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x2999
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x344
200D
Programming Language
binary search
,
brute force
,
expression parsing
,
implementation
1800
x916
200C
Football Championship
brute force
,
implementation
1800
x1057
200B
Drinks
implementation
,
math
800
x115537
200A
Cinema
brute force
,
data structures
2400
x680
199B
Special Olympics
geometry
1900
x804
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x26342
198E
Gripping Story
binary search
,
data structures
,
sortings
2400
x414
198D
Cube Snake
constructive algorithms
2700
x105
198C
Delivering Carcinogen
binary search
,
geometry
2400
x374
198B
Jumping on Walls
shortest paths
1400
x4269
198A
About Bacteria
implementation
,
math
1700
x3149
197B
Limit
math
1400
x4635
197A
Plate Game
constructive algorithms
,
games
,
math
1600
x6303
196E
Opening Portals
dsu
,
graphs
,
shortest paths
2600
x924
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x531
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x960
196B
Infinite Maze
dfs and similar
,
graphs
2000
x2207
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5395
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x703
195D
Analyzing Polyline
geometry
,
math
,
sortings
1900
x1040
195C
Try and Catch
expression parsing
,
implementation
1800
x1141
195B
After Training
data structures
,
implementation
,
math
1300
x5197
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x8985
194B
Square
math
1200
x3516
194A
Exams
implementation
,
math
900
x9868
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x340
193D
Two Segments
data structures
2900
x469
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x516
193B
Xor
brute force
2000
x1009
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3998
192B
Walking in the Rain
brute force
,
implementation
1100
x6253
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10383
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x842
191D
Metro Scheme
graphs
,
greedy
2700
x364
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x7177
191B
Demonstration
greedy
1700
x1010
191A
Dynasty Puzzles
dp
1500
x3953
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1525
190D
Non-Secret Cypher
two pointers
1900
x2303
190C
STL
dfs and similar
1500
x2822
190B
Surrounded
geometry
1800
x2831
190A
Vasya and the Bus
greedy
,
math
1100
x5859
189B
Counting Rhombi
brute force
,
math
1300
x3943
189A
Cut Ribbon
brute force
,
dp
1300
x66640
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x252
188G
Array Sorting
*special problem
,
implementation
1600
x333
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