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Codeforces Round 950 (Div. 3)
46:08:25
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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
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
1623A
Robot Cleaner
brute force
,
implementation
,
math
800
x19914
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x598
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3894
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20598
1622A
Construct a Rectangle
geometry
,
math
800
x29558
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x626
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x3982
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6752
1620C
BA-String
brute force
,
dp
,
greedy
,
implementation
,
math
1800
x6392
1620B
Triangles on a Rectangle
geometry
,
greedy
,
math
1000
x19804
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x2031
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x8745
1619B
Squares and Cubes
implementation
,
math
800
x30197
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4066
1618E
Singers' Tour
constructive algorithms
,
math
1700
x6996
1618D
Array and Operations
dp
,
greedy
,
math
1300
x18387
1618C
Paint the Array
math
1100
x21726
1618A
Polycarp and Sums of Subsequences
math
,
sortings
800
x31701
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x839
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1716
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14653
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22558
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x803
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x586
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4736
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x12010
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x767
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1408
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8088
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15302
1615A
Closing The Gap
greedy
,
math
800
x20548
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x9962
1613D
MEX Sequences
dp
,
math
1900
x4455
1613A
Long Comparison
implementation
,
math
900
x24044
1612D
X-Magic Pair
math
,
number theory
1600
x8874
1612C
Chat Ban
binary search
,
math
1300
x16023
1611B
Team Composition: Programmers and Mathematicians
binary search
,
constructive algorithms
,
math
800
x28711
1611A
Make Even
constructive algorithms
,
math
800
x30794
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1633
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2600
1610A
Anti Light's Cell Guessing
math
900
x15828
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x364
1609A
Divide and Multiply
greedy
,
implementation
,
math
,
number theory
900
x16729
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1355
1608A
Find Array
constructive algorithms
,
math
800
x18760
1607D
Blue-Red Permutation
greedy
,
math
,
sortings
1300
x16456
1607B
Odd Grasshopper
math
900
x24816
1606E
Arena
combinatorics
,
dp
,
math
2100
x3362
1606B
Update Files
greedy
,
implementation
,
math
1100
x18321
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x1000
1605A
A.M. Deviation
math
,
number theory
800
x20379
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x269
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x404
1603C
Extreme Extension
dp
,
greedy
,
math
,
number theory
2300
x1985
1603B
Moderate Modular Mode
constructive algorithms
,
math
,
number theory
1600
x13123
1603A
Di-visible Confusion
constructive algorithms
,
math
,
number theory
1300
x16249
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x169
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x13425
1600F
Party Organization
brute force
,
math
,
probabilities
2300
x436
1599H
Hidden Fortress
interactive
,
math
2100
x1016
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x358
1599C
Bubble Strike
combinatorics
,
math
,
probabilities
,
ternary search
2000
x1569
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x326
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2251
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8438
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20159
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1269
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1449
1594E1
Rubik's Cube Coloring (easy version)
combinatorics
,
math
1300
x10907
1594C
Make Them Equal
brute force
,
greedy
,
math
,
strings
1200
x18146
1594B
Special Numbers
bitmasks
,
math
1100
x19253
1594A
Consecutive Sum Riddle
math
800
x23943
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2364
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4831
1593D1
All are Same
math
,
number theory
1100
x19662
1593B
Make it Divisible by 25
dfs and similar
,
dp
,
greedy
,
math
,
math
900
x25452
1593A
Elections
math
800
x35726
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1550
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2168
1592B
Hemose Shopping
constructive algorithms
,
dsu
,
math
,
sortings
1200
x15640
1592A
Gamer Hemose
binary search
,
greedy
,
math
,
sortings
800
x21689
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x163
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1154
1585D
Yet Another Sorting Problem
data structures
,
math
1900
x3648
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3573
1584C
Two Arrays
greedy
,
math
,
sortings
900
x16047
1584B
Coloring Rectangles
greedy
,
math
1000
x13135
1584A
Mathematical Addition
math
800
x14661
1583G
Omkar and Time Travel
data structures
,
math
3000
x404
1583A
Windblume Ode
math
,
number theory
800
x13568
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3608
1582D
Vupsen, Pupsen and 0
constructive algorithms
,
math
1600
x10181
1582B
Luntik and Subsequences
combinatorics
,
math
900
x19089
1582A
Luntik and Concerts
math
800
x18311
1581B
Diameter of Graph
constructive algorithms
,
graphs
,
greedy
,
math
1200
x11076
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13286
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x131
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4596
1579E1
Permutation Minimization by Deque
constructive algorithms
,
greedy
,
math
1000
x20971
1579A
Casimir's String Solitaire
math
,
strings
800
x37966
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