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Codeforces Round 973 (Div. 2)
13:27:45
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Difficulty:
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brute force
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
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x413
260E
Dividing Kingdom
binary search
,
brute force
,
data structures
2500
x455
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3798
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x13915
259A
Little Elephant and Chess
brute force
,
strings
1000
x9108
258B
Little Elephant and Elections
brute force
,
combinatorics
,
dp
1900
x1446
257C
View Angle
brute force
,
geometry
,
math
1800
x4292
255C
Almost Arithmetical Progression
brute force
,
dp
1500
x4695
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x535
254B
Jury Size
brute force
,
implementation
1500
x2144
253D
Table with Letters - 2
brute force
,
two pointers
2000
x829
252B
Unsorting Array
brute force
,
sortings
1800
x1708
252A
Little Xor
brute force
,
implementation
1100
x5263
250E
Mad Joe
brute force
2000
x465
246D
Colorful Graph
brute force
,
dfs and similar
,
graphs
1600
x9397
246C
Beauty Pageant
brute force
,
constructive algorithms
,
greedy
1600
x2621
245G
Suggested Friends
brute force
,
graphs
2200
x431
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x875
244B
Undoubtedly Lucky Numbers
bitmasks
,
brute force
,
dfs and similar
1600
x4461
242A
Heads or Tails
brute force
,
implementation
1100
x6365
241F
Race
brute force
,
implementation
2300
x263
239B
Easy Tape Programming
brute force
,
implementation
1500
x1367
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x207197
233B
Non-square Equation
binary search
,
brute force
,
math
1400
x7444
231D
Magic Box
brute force
,
geometry
1600
x4073
231A
Team
brute force
,
greedy
800
x320310
229A
Shifts
brute force
,
two pointers
1500
x3496
228B
Two Tables
brute force
,
implementation
1400
x3459
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x26521
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10722
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6642
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x9364
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x250
217B
Blackboard Fibonacci
brute force
,
math
2100
x889
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x21054
215C
Crosses
brute force
,
implementation
2100
x664
215A
Bicycle Chain
brute force
,
implementation
900
x14425
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4954
214A
System of Equations
brute force
800
x35081
205B
Little Elephant and Sorting
brute force
,
greedy
1400
x6019
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x22260
203B
Game on Paper
brute force
,
implementation
1300
x2576
203A
Two Problems
brute force
,
implementation
1200
x4152
202B
Brand New Easy Problem
brute force
1700
x813
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x16682
201D
Brand New Problem
bitmasks
,
brute force
,
dp
2600
x413
200D
Programming Language
binary search
,
brute force
,
expression parsing
,
implementation
1800
x908
200C
Football Championship
brute force
,
implementation
1800
x1052
200A
Cinema
brute force
,
data structures
2400
x679
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x26208
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x8949
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x332
193B
Xor
brute force
2000
x1009
192B
Walking in the Rain
brute force
,
implementation
1100
x6241
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10350
189B
Counting Rhombi
brute force
,
math
1300
x3939
189A
Cut Ribbon
brute force
,
dp
1300
x66108
183B
Zoo
brute force
,
geometry
1700
x689
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x8024
181B
Number of Triplets
binary search
,
brute force
1300
x2996
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x7025
177D1
Encrypting Messages
brute force
1200
x2144
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2546
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x264
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x296
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2375
173C
Spiral Maximum
brute force
,
dp
1900
x975
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x6094
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1269
171D
Broken checker
*special problem
,
brute force
1300
x2561
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6727
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12186
164D
Minimum Diameter
binary search
,
brute force
3100
x235
163D
Large Refrigerator
brute force
2900
x503
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x467
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4850
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4297
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2978
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6234
157A
Game Outcome
brute force
800
x7559
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x162
156A
Message
brute force
1700
x3033
155A
I_love_\%username\%
brute force
800
x74675
152D
Frames
brute force
2600
x241
146B
Lucky Mask
brute force
,
implementation
1300
x4343
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13758
142C
Help Caretaker
brute force
,
dp
2300
x913
142A
Help Farmer
brute force
,
math
1600
x2605
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1675
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x173
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x299
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2338
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2012
134A
Average Numbers
brute force
,
implementation
1200
x3941
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x12117
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2538
126E
Pills
brute force
,
flows
2900
x83
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1429
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3883
122B
Lucky Substring
brute force
,
implementation
1000
x12292
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