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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
32:01:54
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data structures
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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Custom test
Problems
#
Name
295E
Yaroslav and Points
data structures
2500
x642
295A
Greg and Array
data structures
,
implementation
1400
x15992
293E
Close Vertices
data structures
,
divide and conquer
,
trees
2700
x1265
292E
Copying Data
data structures
1900
x3897
292D
Connected Components
data structures
,
dfs and similar
,
dp
,
dsu
1900
x2304
286D
Tourists
data structures
,
sortings
2600
x371
283E
Cow Tennis Tournament
combinatorics
,
data structures
,
math
2800
x715
283A
Cows and Sequence
constructive algorithms
,
data structures
,
implementation
1600
x6469
282E
Sausage Maximization
bitmasks
,
data structures
,
trees
2200
x3343
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x196
280D
k-Maximum Subsequence Sum
data structures
,
flows
,
graphs
,
implementation
2800
x1185
280B
Maximum Xor Secondary
data structures
,
implementation
,
two pointers
1800
x4357
276E
Little Girl and Problem on Trees
data structures
,
graphs
,
trees
2100
x1541
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x23921
274E
Mirror Room
data structures
,
implementation
3000
x299
272C
Dima and Staircase
data structures
,
implementation
1500
x6667
271D
Good Substrings
data structures
,
strings
1800
x10245
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4073
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x413
266E
More Queries to Array...
data structures
,
math
2500
x718
264E
Roadside Trees
data structures
,
dp
3000
x396
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10584
263E
Rhombus
brute force
,
data structures
,
dp
2500
x394
260E
Dividing Kingdom
binary search
,
brute force
,
data structures
2500
x408
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1026
257E
Greedy Elevator
data structures
,
implementation
2200
x275
256E
Lucky Arrays
data structures
2400
x653
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x520
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2518
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x374
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x2947
243E
Matrix
data structures
3000
x171
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x208
242E
XOR on Segment
bitmasks
,
data structures
2000
x8382
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x748
240F
TorCoder
data structures
2600
x1775
238D
Tape Programming
data structures
,
implementation
2900
x244
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1979
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x441
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1536
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4450
228D
Zigzag
data structures
2100
x374
226E
Noble Knight's Path
data structures
,
trees
2900
x431
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x842
223B
Two Strings
data structures
,
dp
,
strings
1900
x1717
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2483
222B
Cosmic Tables
data structures
,
implementation
1300
x5978
220E
Little Elephant and Inversions
data structures
,
two pointers
2400
x1327
220C
Little Elephant and Shifts
data structures
2100
x921
220B
Little Elephant and Array
constructive algorithms
,
data structures
1800
x9358
219E
Parking Lot
data structures
2200
x601
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x290
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x764
212D
Cutting a Fence
binary search
,
data structures
,
dsu
2500
x451
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6054
207C3
Game with Two Trees
data structures
2700
x112
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1077
204B
Little Elephant and Cards
binary search
,
data structures
1500
x5002
200A
Cinema
brute force
,
data structures
2400
x656
198E
Gripping Story
binary search
,
data structures
,
sortings
2400
x400
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x503
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x686
195B
After Training
data structures
,
implementation
,
math
1300
x5119
193D
Two Segments
data structures
2900
x387
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x805
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x6706
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1429
187E
Heaven Tour
data structures
,
greedy
2900
x91
187D
BRT Contract
data structures
2800
x499
185E
Soap Time! - 2
binary search
,
data structures
3000
x103
182C
Optimal Sum
data structures
,
greedy
2000
x705
177D2
Encrypting Messages
data structures
1500
x1770
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1019
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x64
174C
Range Increments
data structures
,
greedy
1800
x1065
173E
Camping Groups
data structures
,
sortings
2600
x534
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x190
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1582
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1520
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x576
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x987
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2915
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x8866
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2181
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x787
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x625
145E
Lucky Queries
data structures
2400
x2894
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x237
144E
Competition
data structures
,
greedy
2200
x561
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x3774
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4196
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x844
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1186
121E
Lucky Array
data structures
2400
x1605
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x307
115E
Linear Kingdom Races
data structures
,
dp
2400
x1357
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2709
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3535
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x1980
101B
Buses
binary search
,
data structures
,
dp
1700
x2486
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