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Educational Codeforces Round 195 (Rated for Div. 2)
12:53:48
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
300B
Coach
brute force
,
dfs and similar
,
graphs
1500
x7458
300A
Array
brute force
,
constructive algorithms
,
implementation
1100
x28541
298B
Sail
brute force
,
greedy
,
implementation
1200
x16121
298A
Snow Footprints
greedy
,
implementation
1300
x11832
296A
Yaroslav and Permutations
greedy
,
math
1100
x26654
295A
Greg and Array
data structures
,
implementation
1400
x28431
293A
Weird Game
games
,
greedy
1500
x3250
292B
Network Topology
graphs
,
implementation
1200
x11099
292A
SMSC
implementation
1100
x2934
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3109
290D
Orange
*special problem
,
implementation
1400
x1919
290B
QR code
*special problem
,
implementation
1500
x2639
290A
Mysterious strings
*special problem
,
implementation
1400
x3274
289B
Polo the Penguin and Matrix
brute force
,
dp
,
implementation
,
sortings
,
ternary search
1400
x19326
289A
Polo the Penguin and Segments
brute force
,
implementation
1100
x10555
288B
Polo the Penguin and Houses
combinatorics
1500
x3265
288A
Polo the Penguin and Strings
greedy
1300
x6875
287A
IQ Test
brute force
,
implementation
1100
x22404
286A
Lucky Permutation
constructive algorithms
,
math
1400
x3492
285C
Building Permutation
greedy
,
implementation
,
sortings
1200
x26829
285B
Find Marble
implementation
1200
x15877
285A
Slightly Decreasing Permutations
greedy
,
implementation
1100
x14306
284A
Cows and Primitive Roots
implementation
,
math
,
number theory
1400
x7543
282C
XOR and OR
constructive algorithms
,
implementation
,
math
1500
x10454
282B
Painting Eggs
greedy
,
math
1500
x14205
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x81033
279A
Point on Spiral
brute force
,
geometry
,
implementation
1400
x6007
278B
New Problem
brute force
,
strings
1500
x3666
277A
Learning Languages
dfs and similar
,
dsu
1400
x22528
276C
Little Girl and Maximum Sum
data structures
,
greedy
,
implementation
,
sortings
1500
x43997
276B
Little Girl and Game
games
,
greedy
1300
x33036
274A
k-Multiple Free Set
binary search
,
greedy
,
sortings
1500
x10941
272C
Dima and Staircase
data structures
,
implementation
1500
x7292
272B
Dima and Sequence
implementation
,
math
1400
x4350
271C
Secret
constructive algorithms
,
implementation
1500
x3167
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x16043
270B
Multithreading
data structures
,
greedy
,
implementation
1400
x4495
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x52294
268C
Beautiful Sets of Points
constructive algorithms
,
implementation
1500
x14798
264B
Good Sequences
dp
,
number theory
1500
x12548
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x11950
262B
Roma and Changing Signs
greedy
1200
x12543
261A
Maxim and Discounts
greedy
,
sortings
1400
x5684
260A
Adding Digits
implementation
,
math
1400
x16932
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x14806
258A
Little Elephant and Bits
greedy
,
math
1100
x27119
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x7900
257A
Sockets
greedy
,
implementation
,
sortings
1100
x7020
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x5126
255B
Code Parsing
implementation
1200
x5551
254B
Jury Size
brute force
,
implementation
1500
x2283
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x7890
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x12605
253A
Boys and Girls
greedy
1100
x12362
252A
Little Xor
brute force
,
implementation
1100
x5982
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x22318
250B
Restoring IPv6
implementation
,
strings
1500
x2287
248B
Chilly Willy
math
,
number theory
1400
x5919
246B
Increase and Decrease
greedy
,
math
1300
x12499
245E
Mishap in Club
greedy
,
implementation
1400
x3563
245D
Restoring Table
constructive algorithms
,
greedy
1500
x2960
245B
Internet Address
implementation
,
strings
1100
x5571
242B
Big Segment
implementation
,
sortings
1100
x17610
242A
Heads or Tails
brute force
,
implementation
1100
x6937
241A
Old Peykan
greedy
1300
x2453
239B
Easy Tape Programming
brute force
,
implementation
1500
x1501
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x21019
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2221
237B
Young Table
implementation
,
sortings
1500
x2393
236B
Easy Number Challenge
implementation
,
number theory
1300
x17773
234C
Weather
dp
,
implementation
1300
x6117
234A
Lefthanders and Righthanders
implementation
1200
x4752
233B
Non-square Equation
binary search
,
brute force
,
math
1400
x8416
231B
Magic, Wizardry and Wonders
constructive algorithms
,
greedy
1500
x4025
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x102343
229A
Shifts
brute force
,
two pointers
1500
x3814
228B
Two Tables
brute force
,
implementation
1400
x3673
227B
Effective Approach
implementation
1100
x33500
227A
Where do I Turn?
geometry
1300
x4718
226A
Flying Saucer Segments
math
1400
x4422
225A
Dice Tower
constructive algorithms
,
greedy
1100
x14544
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x8242
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x31182
222B
Cosmic Tables
data structures
,
implementation
1300
x6648
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x12081
221B
Little Elephant and Numbers
implementation
1300
x5027
220A
Little Elephant and Problem
implementation
,
sortings
1300
x13464
219B
Special Offer! Super Price 999 Bourles!
implementation
1400
x6213
218B
Airport
implementation
1100
x18821
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x10766
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x25925
216A
Tiling with Hexagons
implementation
,
math
1200
x5357
215B
Olympic Medal
greedy
,
math
1300
x6068
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x2421
208D
Prizes, Prizes, more Prizes
implementation
1200
x8133
205B
Little Elephant and Sorting
brute force
,
greedy
1400
x6548
204B
Little Elephant and Cards
binary search
,
data structures
1500
x6046
204A
Little Elephant and Interval
binary search
,
combinatorics
,
dp
1500
x6839
203C
Photographer
greedy
,
sortings
1400
x6131
203B
Game on Paper
brute force
,
implementation
1300
x2858
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