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Before contest
Codeforces Round 1101 (Div. 2)
01:48:33
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Difficulty:
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constructive algorithms
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x881
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4861
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x153
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x385
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4454
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x19087
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x21275
1562C
Rings
constructive algorithms
,
math
1500
x14329
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x20588
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4987
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x6769
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x3080
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x16145
1559C
Mocha and Hiking
constructive algorithms
,
graphs
1200
x22949
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x46329
1558C
Bottom-Tier Reversals
constructive algorithms
,
greedy
2000
x3735
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x766
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x8772
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x15642
1555C
Coin Rows
brute force
,
constructive algorithms
,
dp
,
implementation
1300
x24202
1554D
Diane
constructive algorithms
,
greedy
,
strings
1800
x10594
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x1219
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3788
1552E
Colors and Intervals
constructive algorithms
,
data structures
,
greedy
,
sortings
2300
x2130
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x7909
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x6296
1551D2
Domino (hard version)
constructive algorithms
,
implementation
,
math
2100
x2992
1551D1
Domino (easy version)
constructive algorithms
,
math
1700
x7584
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x16705
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x2063
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x18658
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x609
1545C
AquaMoon and Permutations
2-sat
,
brute force
,
combinatorics
,
constructive algorithms
,
graph matchings
,
graphs
2800
x769
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x452
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x2174
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x8024
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x26646
1541A
Pretty Permutations
constructive algorithms
,
greedy
,
implementation
800
x30756
1540A
Great Graphs
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
sortings
1400
x15016
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x1056
1538D
Another Problem About Dividing Numbers
constructive algorithms
,
math
,
number theory
1700
x15327
1537F
Figure Fixing
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
2200
x2820
1537C
Challenging Cliffs
constructive algorithms
,
greedy
,
implementation
,
math
1200
x30389
1537B
Bad Boy
constructive algorithms
,
greedy
,
math
900
x42912
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x1104
1536B
Prinzessin der Verurteilung
brute force
,
constructive algorithms
,
strings
1200
x25365
1536A
Omkar and Bad Story
brute force
,
constructive algorithms
800
x20787
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x262
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x6827
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x61
1533G
Biome Map
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
x98
1531C
Симметричный амфитеатр
*special problem
,
constructive algorithms
,
dp
x659
1530G
What a Reversal
constructive algorithms
3300
x185
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x3279
1530D
Secret Santa
constructive algorithms
,
flows
,
graphs
,
greedy
,
math
1600
x10121
1530B
Putting Plates
constructive algorithms
,
implementation
800
x16296
1529A
Eshag Loves Big Arrays
constructive algorithms
,
greedy
,
math
800
x31060
1528D
It's a bird! No, it's a plane! No, it's AaParsa!
constructive algorithms
,
graphs
,
shortest paths
2500
x1706
1527B2
Palindrome Game (hard version)
constructive algorithms
,
games
1900
x8732
1527B1
Palindrome Game (easy version)
constructive algorithms
,
games
1200
x34845
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x393
1526E
Oolimry and Suffix Array
combinatorics
,
constructive algorithms
,
math
2400
x1437
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2805
1526A
Mean Inequality
constructive algorithms
,
sortings
800
x25046
1525B
Permutation Sort
constructive algorithms
,
greedy
900
x26694
1523B
Lord of the Values
constructive algorithms
1100
x12519
1521E
Nastia and a Beautiful Matrix
binary search
,
constructive algorithms
,
dp
,
greedy
2700
x735
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x2313
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4622
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x22974
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x42201
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x3362
1520C
Not Adjacent Matrix
constructive algorithms
1000
x34621
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x907
1517G
Starry Night Camping
constructive algorithms
,
flows
,
graphs
3300
x715
1517C
Fillomino 2
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
1400
x14190
1517B
Morning Jogging
constructive algorithms
,
greedy
,
sortings
1200
x13846
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x14194
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x2085
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x18803
1515A
Phoenix and Gold
constructive algorithms
,
greedy
,
math
800
x21238
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
2500
x1434
1513E
Cost Equilibrium
combinatorics
,
constructive algorithms
,
math
,
sortings
2300
x1736
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x6521
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x20347
1513A
Array and Peaks
constructive algorithms
,
implementation
800
x20041
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x24595
1512C
A-B Palindrome
constructive algorithms
,
implementation
,
strings
1200
x21793
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x12481
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x24737
1510J
Japanese Game
constructive algorithms
,
math
2700
x563
1509A
Average Height
constructive algorithms
800
x27293
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x392
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x732
1508B
Almost Sorted
binary search
,
combinatorics
,
constructive algorithms
,
implementation
1800
x4462
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x6689
1506F
Triangular Paths
constructive algorithms
,
graphs
,
math
,
shortest paths
,
sortings
2000
x3712
1506E
Restoring the Permutation
constructive algorithms
,
implementation
1500
x14224
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x25670
1504B
Flip the Bits
constructive algorithms
,
greedy
,
implementation
,
math
1200
x26075
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