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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
32:44:33
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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
358B
Dima and Text Messages
brute force
,
strings
1500
x3744
358A
Dima and Continuous Line
brute force
,
implementation
1400
x7799
357B
Flag Day
constructive algorithms
,
implementation
1400
x8226
357A
Group of Students
brute force
,
greedy
,
implementation
1000
x6889
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x410
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x974
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1275
356B
Xenia and Hamming
implementation
,
math
1900
x1954
356A
Knight Tournament
data structures
,
dsu
1500
x13892
355B
Vasya and Public Transport
greedy
,
implementation
1100
x4523
355A
Vasya and Digital Root
constructive algorithms
,
implementation
1100
x9483
354E
Lucky Number Representation
constructive algorithms
,
dfs and similar
,
dp
2200
x878
354D
Transferring Pyramid
dp
2900
x465
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x3098
354B
Game with Strings
bitmasks
,
dp
,
games
2400
x462
354A
Vasya and Robot
brute force
,
greedy
,
math
1500
x5495
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x591
353D
Queue
constructive algorithms
,
dp
2000
x2950
353C
Find Maximum
implementation
,
math
,
number theory
1600
x4940
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2294
353A
Domino
implementation
,
math
1200
x18703
352B
Jeff and Periods
implementation
,
sortings
1300
x16687
352A
Jeff and Digits
brute force
,
implementation
,
math
1000
x26001
351E
Jeff and Permutation
greedy
2200
x1616
351D
Jeff and Removing Periods
data structures
2700
x1096
351C
Jeff and Brackets
dp
,
matrices
2500
x565
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2414
351A
Jeff and Rounding
dp
,
greedy
,
implementation
,
math
1800
x2941
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x779
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x271
350C
Bombs
greedy
,
implementation
,
sortings
1600
x6572
350B
Resort
graphs
1500
x3206
350A
TL
brute force
,
greedy
,
implementation
1200
x16525
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x14074
349A
Cinema Line
greedy
,
implementation
1100
x30521
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x445
348D
Turtles
dp
,
matrices
2500
x1755
348C
Subset Sums
brute force
,
data structures
2500
x2237
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2111
348A
Mafia
binary search
,
math
,
sortings
1600
x13322
347B
Fixed Points
brute force
,
implementation
,
math
1100
x9355
347A
Difference Row
constructive algorithms
,
implementation
,
sortings
1300
x9047
346E
Doodle Jump
math
,
number theory
3000
x265
346D
Robot Control
dp
,
graphs
,
shortest paths
2600
x757
346C
Number Transformation II
greedy
,
math
2200
x1439
346B
Lucky Common Subsequence
dp
,
strings
2000
x3593
346A
Alice and Bob
games
,
math
,
number theory
1600
x8752
345G
Suffix Subgroup
*special problem
,
strings
2200
x100
345F
Superstitions Inspection
*special problem
2700
x47
345E
Black Cat Rush
*special problem
2700
x50
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x79
345C
Counting Fridays
*special problem
2000
x126
345B
Triskaidekaphobia
*special problem
2100
x125
345A
Expecting Trouble
*special problem
,
probabilities
1500
x494
344B
Simple Molecules
brute force
,
graphs
,
math
1200
x8918
344A
Magnets
implementation
800
x124588
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x765
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5904
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x3032
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x14135
343A
Rational Resistance
math
,
number theory
1600
x8806
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x8702
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x503
342C
Cupboard and Balloons
geometry
1900
x1861
342B
Xenia and Spies
brute force
,
greedy
,
implementation
1500
x4030
342A
Xenia and Divisors
greedy
,
implementation
1200
x12735
341E
Candies Game
constructive algorithms
,
greedy
3000
x462
341D
Iahub and Xors
data structures
2500
x1245
340E
Iahub and Permutations
combinatorics
,
math
2000
x2490
340D
Bubble Sort Graph
binary search
,
data structures
,
dp
1500
x7276
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4253
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2098
340A
The Wall
math
1200
x7737
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x554
339D
Xenia and Bit Operations
data structures
,
trees
1700
x26368
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8361
339B
Xenia and Ringroad
implementation
1000
x71047
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x221548
338E
Optimize!
data structures
2600
x1012
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1180
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1031
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x6230
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4958
337B
Routine Problem
greedy
,
math
,
number theory
1400
x9422
337A
Puzzles
greedy
900
x81408
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x116
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x1023
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x2502
336B
Vasily the Bear and Fly
math
1900
x1251
336A
Vasily the Bear and Triangle
implementation
,
math
1000
x10164
335F
Buy One, Get One Free
dp
,
greedy
3000
x601
335E
Counting Skyscrapers
dp
,
math
,
probabilities
2800
x225
335D
Rectangles and Square
brute force
,
dp
2400
x331
335C
More Reclamation
games
2100
x541
335B
Palindrome
constructive algorithms
,
dp
1900
x2113
335A
Banana
binary search
,
constructive algorithms
,
greedy
1400
x2627
334B
Eight Point Sets
sortings
1400
x3616
334A
Candy Bags
implementation
1000
x18777
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1151
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x2127
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