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Rayan
→ Pay attention
Before contest
Codeforces Round 995 (Div. 3)
12:55:48
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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
#
Name
319B
Psychos in a Line
data structures
,
implementation
1900
x4223
317B
Ants
brute force
,
implementation
2000
x1607
314C
Sereja and Subsequences
data structures
,
dp
2000
x1841
314B
Sereja and Periods
binary search
,
dfs and similar
,
strings
2000
x1525
313D
Ilya and Roads
dp
2100
x1485
309C
Memory for Arrays
binary search
,
bitmasks
,
greedy
1900
x1371
309B
Context Advertising
dp
,
two pointers
2100
x722
309A
Morning run
binary search
,
math
,
two pointers
2000
x491
306C
White, Black and White Again
combinatorics
,
number theory
2100
x489
306B
Optimizer
data structures
,
greedy
,
sortings
2100
x450
301B
Yaroslav and Time
binary search
,
graphs
,
shortest paths
2100
x2412
296B
Yaroslav and Two Strings
combinatorics
,
dp
2000
x2318
295C
Greg and Friends
combinatorics
,
dp
,
graphs
,
shortest paths
2100
x1760
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3863
292E
Copying Data
data structures
1900
x4221
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2460
292C
Beautiful IP Addresses
brute force
2000
x1174
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1326
286C
Main Sequence
greedy
,
implementation
2100
x1516
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1557
283C
Coin Troubles
dp
2100
x1456
282D
Yet Another Number Game
dp
,
games
2100
x1449
280A
Rectangle Puzzle
geometry
2000
x1474
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1458
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1625
269C
Flawed Flow
constructive algorithms
,
flows
,
graphs
,
greedy
2100
x1691
268E
Playlist
math
,
probabilities
,
sortings
2100
x1028
267B
Dominoes
dfs and similar
,
graphs
2000
x649
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1357
264C
Choosing Balls
dp
2000
x2973
263C
Circle of Numbers
brute force
,
dfs and similar
,
implementation
2000
x1081
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x780
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1421
260D
Black and White Tree
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
2100
x1563
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x1802
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1454
257D
Sum
greedy
,
math
1900
x1635
254E
Dormitory
dp
,
implementation
2100
x678
253D
Table with Letters - 2
brute force
,
two pointers
2000
x851
251C
Number Transformation
dp
,
greedy
,
number theory
2000
x1048
250E
Mad Joe
brute force
2000
x469
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x897
248C
Robo-Footballer
binary search
,
geometry
2000
x856
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x897
243B
Hydra
graphs
,
sortings
2000
x1244
242E
XOR on Segment
bitmasks
,
data structures
2000
x9585
242D
Dispute
dfs and similar
,
graphs
,
greedy
2100
x1886
241G
Challenging Balloons
constructive algorithms
1900
x550
241C
Mirror Box
geometry
,
implementation
2000
x512
238C
World Eater Brothers
dfs and similar
,
dp
,
greedy
,
trees
2100
x1251
237E
Build String
flows
,
graphs
2000
x1765
237D
T-decomposition
dfs and similar
,
graphs
,
greedy
,
trees
2000
x570
235B
Let's Play Osu!
dp
,
math
,
probabilities
2000
x3615
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x573
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1484
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1919
229D
Towers
dp
,
greedy
,
two pointers
2100
x2288
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1649
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2506
228D
Zigzag
data structures
2100
x386
228C
Fractal Detector
dp
,
hashing
2000
x469
226D
The table
constructive algorithms
,
greedy
2100
x978
226B
Naughty Stone Piles
greedy
1900
x1569
225E
Unsolvable
math
,
number theory
2100
x817
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1592
223B
Two Strings
data structures
,
dp
,
strings
1900
x1825
222E
Decoding Genome
dp
,
matrices
1900
x2866
222D
Olympiad
binary search
,
greedy
,
sortings
,
two pointers
1900
x2174
220C
Little Elephant and Shifts
data structures
2100
x948
217B
Blackboard Fibonacci
brute force
,
math
2100
x900
216E
Martian Luck
math
,
number theory
2000
x591
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x578
215D
Hot Days
greedy
1900
x1608
215C
Crosses
brute force
,
implementation
2100
x672
213C
Relay Race
dp
2000
x2911
213B
Numbers
combinatorics
,
dp
1900
x1791
212C
Cowboys
combinatorics
,
dp
,
math
2100
x389
209B
Pixels
constructive algorithms
,
math
2100
x401
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6992
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1913
208B
Solitaire
dfs and similar
,
dp
1900
x1366
207D6
The Beaver's Problem - 3
2100
x84
207D4
The Beaver's Problem - 3
2100
x154
207D3
The Beaver's Problem - 3
2000
x136
207D2
The Beaver's Problem - 3
2000
x110
207D10
The Beaver's Problem - 3
2100
x82
207C1
Game with Two Trees
2100
x107
207B2
Military Trainings
1900
x197
207A3
Beaver's Calculator 1.0
greedy
2000
x221
204C
Little Elephant and Furik and Rubik
math
,
probabilities
2000
x1127
201C
Fragile Bridges
dp
2000
x1375
199B
Special Olympics
geometry
1900
x806
196B
Infinite Maze
dfs and similar
,
graphs
2000
x2229
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x731
195D
Analyzing Polyline
geometry
,
math
,
sortings
1900
x1046
193B
Xor
brute force
2000
x1020
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x7371
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1563
190D
Non-Secret Cypher
two pointers
1900
x2352
187C
Weak Memory
dfs and similar
,
dsu
2000
x1386
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