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Educational Codeforces Round 169 (Rated for Div. 2)
16:31:00
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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
282C
XOR and OR
constructive algorithms
,
implementation
,
math
1500
x9315
282B
Painting Eggs
greedy
,
math
1500
x12803
281B
Nearest Fraction
brute force
,
implementation
,
two pointers
1700
x2971
279C
Ladder
dp
,
implementation
,
two pointers
1700
x8182
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x50840
279A
Point on Spiral
brute force
,
geometry
,
implementation
1400
x5560
278B
New Problem
brute force
,
strings
1500
x3441
277A
Learning Languages
dfs and similar
,
dsu
1400
x18585
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x13530
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x25511
276B
Little Girl and Game
games
,
greedy
1300
x28083
275B
Convex Shape
constructive algorithms
,
implementation
1700
x2811
274A
k-Multiple Free Set
binary search
,
greedy
,
sortings
1500
x9966
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2609
272C
Dima and Staircase
data structures
,
implementation
1500
x6752
272B
Dima and Sequence
implementation
,
math
1400
x3991
271C
Secret
constructive algorithms
,
implementation
1500
x2930
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x12775
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4110
269B
Greenhouse Effect
dp
1700
x6242
269A
Magical Boxes
greedy
,
math
1600
x3506
268C
Beautiful Sets of Points
constructive algorithms
,
implementation
1500
x13559
264B
Good Sequences
dp
,
number theory
1500
x9970
261A
Maxim and Discounts
greedy
,
sortings
1400
x5138
260C
Balls and Boxes
constructive algorithms
,
greedy
,
implementation
1700
x2948
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3787
260A
Adding Digits
implementation
,
math
1400
x14446
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x7001
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4676
254B
Jury Size
brute force
,
implementation
1500
x2137
253C
Text Editor
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x2569
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10539
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x17198
250C
Movie Critics
greedy
1600
x1902
250B
Restoring IPv6
implementation
,
strings
1500
x1970
248B
Chilly Willy
math
,
number theory
1400
x5274
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9343
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2613
246B
Increase and Decrease
greedy
,
math
1300
x11163
245E
Mishap in Club
greedy
,
implementation
1400
x3258
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2276
245C
Game with Coins
greedy
1700
x1538
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4440
243A
The Brand New Function
bitmasks
1600
x3870
241A
Old Peykan
greedy
1300
x2218
239B
Easy Tape Programming
brute force
,
implementation
1500
x1366
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2023
237C
Primes on Interval
binary search
,
number theory
,
two pointers
1600
x5665
237B
Young Table
implementation
,
sortings
1500
x2226
236B
Easy Number Challenge
implementation
,
number theory
1300
x13933
235A
LCM Challenge
number theory
1600
x17421
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1466
234E
Champions' League
implementation
1600
x995
234D
Cinema
implementation
1600
x1525
234C
Weather
dp
,
implementation
1300
x5422
233B
Non-square Equation
binary search
,
brute force
,
math
1400
x7409
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2492
231D
Magic Box
brute force
,
geometry
1600
x4059
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8529
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x3587
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x73240
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4594
229A
Shifts
brute force
,
two pointers
1500
x3483
228B
Two Tables
brute force
,
implementation
1400
x3449
227A
Where do I Turn?
geometry
1300
x4108
226A
Flying Saucer Segments
math
1400
x3949
225C
Barcode
dp
,
matrices
1700
x8999
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3134
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7260
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2508
222B
Cosmic Tables
data structures
,
implementation
1300
x6049
221B
Little Elephant and Numbers
implementation
1300
x4539
220A
Little Elephant and Problem
implementation
,
sortings
1300
x11915
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x9157
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6617
219B
Special Offer! Super Price 999 Bourles!
implementation
1400
x5779
216D
Spider's Web
binary search
,
sortings
,
two pointers
1700
x1344
216B
Forming Teams
dfs and similar
,
implementation
1700
x6265
215B
Olympic Medal
greedy
,
math
1300
x5491
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4940
213A
Game
dfs and similar
,
greedy
1700
x1710
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1708
209A
Multicolored Marbles
dp
,
math
1600
x2294
207D7
The Beaver's Problem - 3
1600
x97
207D5
The Beaver's Problem - 3
1600
x138
207B3
Military Trainings
1700
x163
207B1
Military Trainings
1600
x262
207A1
Beaver's Calculator 1.0
greedy
1600
x282
205B
Little Elephant and Sorting
brute force
,
greedy
1400
x5993
204B
Little Elephant and Cards
binary search
,
data structures
1500
x5120
204A
Little Elephant and Interval
binary search
,
combinatorics
,
dp
1500
x5628
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1409
203C
Photographer
greedy
,
sortings
1400
x5635
203B
Game on Paper
brute force
,
implementation
1300
x2571
202B
Brand New Easy Problem
brute force
1700
x811
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x2992
198B
Jumping on Walls
shortest paths
1400
x4209
198A
About Bacteria
implementation
,
math
1700
x3133
197B
Limit
math
1400
x4615
197A
Plate Game
constructive algorithms
,
games
,
math
1600
x6228
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