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Before contest
Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)
14:00:59
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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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Custom test
Problems
#
Name
371E
Subway Innovation
greedy
,
math
,
two pointers
2000
x1260
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5453
370E
Summer Reading
dp
,
greedy
2500
x234
370D
Broken Monitor
brute force
,
constructive algorithms
,
greedy
,
implementation
2100
x622
370C
Mittens
constructive algorithms
,
greedy
,
sortings
1800
x1551
369E
Valera and Queries
binary search
,
data structures
2200
x2078
369D
Valera and Fools
dfs and similar
,
dp
,
graphs
,
shortest paths
2200
x1119
367E
Sereja and Intervals
combinatorics
,
dp
2700
x1097
367D
Sereja and Sets
bitmasks
,
dfs and similar
2400
x618
367C
Sereja and the Arrangement of Numbers
graphs
,
greedy
,
sortings
2000
x1724
367B
Sereja ans Anagrams
binary search
,
data structures
1900
x2437
366E
Dima and Magic Guitar
brute force
,
implementation
,
math
2200
x757
366D
Dima and Trap Graph
binary search
,
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
two pointers
2000
x1393
366C
Dima and Salad
dp
1900
x4672
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x538
364D
Ghd
brute force
,
math
,
probabilities
2900
x2007
364C
Beautiful Set
brute force
,
number theory
2300
x588
364B
Free Market
dp
,
greedy
2200
x1153
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x193
363D
Renting Bikes
binary search
,
greedy
1800
x3783
362E
Petya and Pipes
flows
,
graphs
,
shortest paths
2300
x802
362D
Fools and Foolproof Roads
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x917
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1688
360E
Levko and Game
graphs
,
greedy
,
shortest paths
2800
x683
360D
Levko and Sets
number theory
2600
x396
360C
Levko and Strings
combinatorics
,
dp
2500
x1073
360B
Levko and Array
binary search
,
dp
2000
x2777
360A
Levko and Array Recovery
greedy
,
implementation
1700
x2039
359E
Neatness
constructive algorithms
,
dfs and similar
2400
x461
359D
Pair of Numbers
binary search
,
brute force
,
data structures
,
math
,
two pointers
2000
x4963
359C
Prime Number
math
,
number theory
1900
x2986
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x390
358D
Dima and Hares
dp
,
greedy
1800
x3968
358C
Dima and Containers
constructive algorithms
,
greedy
,
implementation
2000
x1972
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x405
356D
Bags and Coins
bitmasks
,
constructive algorithms
,
dp
,
greedy
2700
x942
356C
Compartments
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2100
x1239
356B
Xenia and Hamming
implementation
,
math
1900
x1910
354E
Lucky Number Representation
constructive algorithms
,
dfs and similar
,
dp
2200
x874
354D
Transferring Pyramid
dp
2900
x460
354C
Vasya and Beautiful Arrays
brute force
,
dp
,
number theory
2100
x3022
354B
Game with Strings
bitmasks
,
dp
,
games
2400
x451
353E
Antichain
dp
,
graph matchings
,
greedy
2200
x577
353D
Queue
constructive algorithms
,
dp
2000
x2763
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2265
351E
Jeff and Permutation
greedy
2200
x1516
351D
Jeff and Removing Periods
data structures
2700
x1028
351C
Jeff and Brackets
dp
,
matrices
2500
x542
351B
Jeff and Furik
combinatorics
,
dp
,
probabilities
1900
x2338
351A
Jeff and Rounding
dp
,
greedy
,
implementation
,
math
1800
x2865
350E
Wrong Floyd
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
2200
x755
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x260
349B
Color the Fence
data structures
,
dp
,
greedy
,
implementation
1700
x13751
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x435
348D
Turtles
dp
,
matrices
2500
x1656
348C
Subset Sums
brute force
,
data structures
2500
x2130
348B
Apple Tree
dfs and similar
,
number theory
,
trees
2100
x2067
346E
Doodle Jump
math
,
number theory
3000
x260
346D
Robot Control
dp
,
graphs
,
shortest paths
2600
x710
346C
Number Transformation II
greedy
,
math
2200
x1428
346B
Lucky Common Subsequence
dp
,
strings
2000
x3406
345G
Suffix Subgroup
*special problem
,
strings
2200
x54
345F
Superstitions Inspection
*special problem
2700
x46
345E
Black Cat Rush
*special problem
2700
x46
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x78
345C
Counting Fridays
*special problem
2000
x125
345B
Triskaidekaphobia
*special problem
2100
x124
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x701
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5621
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x2963
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7939
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x492
342C
Cupboard and Balloons
geometry
1900
x1828
341E
Candies Game
constructive algorithms
,
greedy
3000
x440
341D
Iahub and Xors
data structures
2500
x1171
340E
Iahub and Permutations
combinatorics
,
math
2000
x2333
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2050
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x542
339D
Xenia and Bit Operations
data structures
,
trees
1700
x24562
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8224
338E
Optimize!
data structures
2600
x964
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1105
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1013
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5970
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x112
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x939
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x2433
336B
Vasily the Bear and Fly
math
1900
x1208
335F
Buy One, Get One Free
dp
,
greedy
3000
x508
335E
Counting Skyscrapers
dp
,
math
,
probabilities
2800
x219
335D
Rectangles and Square
brute force
,
dp
2400
x321
335C
More Reclamation
games
2100
x521
335B
Palindrome
constructive algorithms
,
dp
1900
x2023
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1087
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x2063
333C
Lucky Tickets
brute force
,
constructive algorithms
2700
x375
333B
Chips
greedy
1800
x2611
332E
Binary Key
dp
,
greedy
,
implementation
2400
x299
332D
Theft of Blueprints
graphs
,
math
2400
x383
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x899
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