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Codeforces Round (Div. 2)
5 days
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Difficulty:
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math
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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Status
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Custom test
Problems
#
Name
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x52349
269E
String Theory
geometry
,
math
,
strings
3100
x122
269A
Magical Boxes
greedy
,
math
1600
x3729
268E
Playlist
math
,
probabilities
,
sortings
2100
x1187
268B
Buttons
implementation
,
math
1000
x36606
267C
Berland Traffic
math
,
matrices
2700
x297
267A
Subtractions
math
,
number theory
900
x9901
266E
More Queries to Array...
data structures
,
math
2500
x1194
266D
BerDonalds
graphs
,
math
,
shortest paths
2400
x1050
266C
Below the Diagonal
constructive algorithms
,
greedy
,
math
2100
x1467
261C
Maxim and Matrix
constructive algorithms
,
dp
,
math
2000
x848
261B
Maxim and Restaurant
dp
,
math
,
probabilities
1900
x1670
260A
Adding Digits
implementation
,
math
1400
x16943
258D
Little Elephant and Broken Sorting
dp
,
math
,
probabilities
2600
x1585
258C
Little Elephant and LCM
binary search
,
combinatorics
,
dp
,
math
2000
x2037
258A
Little Elephant and Bits
greedy
,
math
1100
x27134
257D
Sum
greedy
,
math
1900
x1754
257C
View Angle
brute force
,
geometry
,
math
1800
x4816
255E
Furlo and Rublo and Game
games
,
implementation
,
math
2200
x1035
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x2229
251D
Two Sets
bitmasks
,
math
2700
x760
251B
Playing with Permutations
implementation
,
math
1800
x1388
249E
Endless Matrix
math
2600
x402
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x608
248E
Piglet's Birthday
dp
,
math
,
probabilities
2600
x696
248B
Chilly Willy
math
,
number theory
1400
x5923
246B
Increase and Decrease
greedy
,
math
1300
x12504
241B
Friends
binary search
,
bitmasks
,
data structures
,
math
2700
x1062
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x21032
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2222
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x1004
235B
Let's Play Osu!
dp
,
math
,
probabilities
2000
x4626
233B
Non-square Equation
binary search
,
brute force
,
math
1400
x8431
233A
Perfect Permutation
implementation
,
math
800
x50618
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1708
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x102594
229E
Gifts
combinatorics
,
dp
,
math
,
probabilities
2600
x628
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1871
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x1056
226A
Flying Saucer Segments
math
1400
x4423
225E
Unsolvable
math
,
number theory
2100
x934
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x31200
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1783
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x3127
221A
Little Elephant and Function
implementation
,
math
1000
x17109
220D
Little Elephant and Triangle
geometry
,
math
2500
x364
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x283
217B
Blackboard Fibonacci
brute force
,
math
2100
x1283
216E
Martian Luck
math
,
number theory
2000
x723
216A
Tiling with Hexagons
implementation
,
math
1200
x5368
215B
Olympic Medal
greedy
,
math
1300
x6068
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x5426
212C
Cowboys
combinatorics
,
dp
,
math
2100
x523
209B
Pixels
constructive algorithms
,
math
2100
x509
209A
Multicolored Marbles
dp
,
math
1600
x2973
204C
Little Elephant and Furik and Rubik
math
,
probabilities
2000
x1336
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1525
201B
Guess That Car!
math
,
ternary search
1800
x1411
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x3276
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x376
200B
Drinks
implementation
,
math
800
x157258
198A
About Bacteria
implementation
,
math
1700
x3364
197B
Limit
math
1400
x4977
197A
Plate Game
constructive algorithms
,
games
,
math
1600
x6977
195D
Analyzing Polyline
geometry
,
math
,
sortings
1900
x1142
195B
After Training
data structures
,
implementation
,
math
1300
x5568
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x10405
194B
Square
math
1200
x4060
194A
Exams
implementation
,
math
900
x11118
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x430
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x711
190A
Vasya and the Bus
greedy
,
math
1100
x6380
189B
Counting Rhombi
brute force
,
math
1300
x4276
188C
LCM
*special problem
,
implementation
,
math
1400
x534
185D
Visit of the Great
math
,
number theory
2600
x552
185B
Mushroom Scientists
math
,
ternary search
1800
x1811
185A
Plant
math
1300
x6714
183A
Headquarters
constructive algorithms
,
math
1700
x676
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x9552
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2952
180B
Divisibility Rules
math
,
number theory
2300
x521
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x346
174A
Problem About Equation
math
1100
x3406
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2581
168A
Wizards and Demonstration
implementation
,
math
900
x11721
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x742
167C
Wizards and Numbers
games
,
math
2300
x783
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2606
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2217
166E
Tetrahedron
dp
,
math
,
matrices
1500
x27075
166C
Median
greedy
,
math
,
sortings
1500
x7698
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x14219
160C
Find Pair
implementation
,
math
,
sortings
1700
x3792
154D
Flatland Fencing
games
,
math
2400
x530
154B
Colliders
math
,
number theory
1600
x6378
151A
Soft Drinking
implementation
,
math
800
x100204
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x788
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x5650
150A
Win or Freeze
games
,
math
,
number theory
1400
x8828
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5829
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