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Before contest
Codeforces Round 968 (Div. 2)
37:27:38
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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
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5563
1560D
Make a Power of Two
greedy
,
math
,
strings
1300
x18071
1560C
Infinity Table
implementation
,
math
800
x26491
1560B
Who's Opposite?
math
800
x35365
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2280
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x30637
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4747
1558A
Charmed by the Game
brute force
,
math
1300
x11026
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8539
1557A
Ezzat and Two Subsequences
brute force
,
math
,
sortings
800
x27813
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x364
1556F
Sports Betting
bitmasks
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
2500
x1212
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6812
1556A
A Variety of Operations
math
800
x18032
1555A
PizzaForces
brute force
,
math
900
x27861
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1210
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12686
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x203
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x1012
1553F
Pairwise Modulo
data structures
,
math
2300
x2211
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3300
1553A
Digits Sum
math
,
number theory
800
x30768
1552I
Organizing a Music Festival
dfs and similar
,
math
3400
x125
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6924
1551D2
Domino (hard version)
constructive algorithms
,
implementation
,
math
2100
x2728
1551D1
Domino (easy version)
constructive algorithms
,
math
1700
x7015
1551A
Polycarp and Coins
greedy
,
math
800
x50151
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1827
1550B
Maximum Cost Deletion
greedy
,
math
1000
x26218
1550A
Find The Array
greedy
,
math
800
x27977
1549A
Gregor and Cryptography
math
,
number theory
800
x32164
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x422
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x240
1548D1
Gregor and the Odd Cows (Easy)
bitmasks
,
geometry
,
math
,
number theory
2300
x1446
1548C
The Three Little Pigs
combinatorics
,
dp
,
fft
,
math
2500
x1812
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9671
1547A
Shortest Path with Obstacle
implementation
,
math
800
x30291
1546B
AquaMoon and Stolen String
interactive
,
math
1200
x13022
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x474
1545B
AquaMoon and Chess
combinatorics
,
math
1900
x5879
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x401
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x2001
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7557
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5259
1543B
Customising the Track
combinatorics
,
greedy
,
math
900
x22967
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x27683
1542E2
Abnormal Permutation Pairs (hard version)
combinatorics
,
dp
,
fft
,
math
2700
x840
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1223
1542D
Priority Queue
combinatorics
,
dp
,
implementation
,
math
,
ternary search
2200
x2589
1542C
Strange Function
math
,
number theory
1600
x14028
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x22822
1542A
Odd Set
math
800
x44153
1541B
Pleasant Pairs
brute force
,
implementation
,
math
,
number theory
1200
x27904
1540E
Tasty Dishes
math
,
matrices
3500
x103
1540C2
Converging Array (Hard Version)
dp
,
math
2900
x452
1540C1
Converging Array (Easy Version)
dp
,
math
2700
x611
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2549
1539A
Contest Start
combinatorics
,
geometry
,
greedy
,
math
1000
x19957
1538G
Gift Set
binary search
,
greedy
,
math
,
ternary search
2100
x4497
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x19041
1538D
Another Problem About Dividing Numbers
constructive algorithms
,
math
,
number theory
1700
x13476
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x28085
1538B
Friends and Candies
greedy
,
math
800
x31535
1537F
Figure Fixing
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
2200
x2447
1537D
Deleting Divisors
games
,
math
,
number theory
1700
x12235
1537C
Challenging Cliffs
constructive algorithms
,
greedy
,
implementation
,
math
1200
x27253
1537B
Bad Boy
constructive algorithms
,
greedy
,
math
900
x29355
1537A
Arithmetic Array
greedy
,
math
800
x36883
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x934
1536E
Omkar and Forest
combinatorics
,
graphs
,
math
,
shortest paths
2300
x2382
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x30263
1534C
Little Alawn's Puzzle
combinatorics
,
dp
,
dsu
,
graphs
,
math
1300
x12723
1534B
Histogram Ugliness
greedy
,
implementation
,
math
1100
x12465
1533A
Travel to Bertown
*special problem
,
implementation
,
math
x1073
1532B
Frog Jumping
*special problem
,
math
x822
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x772
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x9125
1530A
Binary Decimal
greedy
,
math
800
x21006
1529B
Sifid and Strange Subsequences
greedy
,
math
,
sortings
1100
x20509
1529A
Eshag Loves Big Arrays
constructive algorithms
,
greedy
,
math
800
x29652
1528F
AmShZ Farm
combinatorics
,
fft
,
math
3300
x284
1528B
Kavi on Pairing Duty
combinatorics
,
dp
,
math
1700
x8628
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1883
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13418
1526E
Oolimry and Suffix Array
combinatorics
,
constructive algorithms
,
math
2400
x1044
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2393
1526B
I Hate 1111
dp
,
math
,
number theory
1400
x30071
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x2031
1525A
Potion-making
math
,
number theory
800
x25282
1523E
Crypto Lights
combinatorics
,
dp
,
math
,
probabilities
2600
x1628
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x21188
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x36610
1520E
Arranging The Sheep
greedy
,
math
1400
x21018
1520D
Same Differences
data structures
,
hashing
,
math
1200
x45817
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x43978
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x15041
1519B
The Cake Is a Lie
dp
,
math
800
x30624
1519A
Red and Blue Beans
math
800
x28618
1517A
Sum of 2050
greedy
,
math
800
x25427
1516E
Baby Ehab Plays with Permutations
combinatorics
,
dp
,
math
2500
x850
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