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Before contest
Codeforces Round 953 (Div. 2)
02:03:23
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Difficulty:
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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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Custom test
Problems
#
Name
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x45
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x73
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x178
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x329
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x324
1571C
Rhyme
*special problem
,
implementation
1800
x369
1571B
Epic Novel
*special problem
,
math
1300
x691
1571A
Sequence of Comparisons
*special problem
800
x1263
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x231
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x788
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4317
1569C
Jury Meeting
combinatorics
,
math
1500
x11751
1569B
Chess Tournament
constructive algorithms
1000
x18645
1569A
Balanced Substring
implementation
800
x25337
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x732
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x3535
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4427
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11918
1567B
MEXor Mixup
bitmasks
,
greedy
1000
x21902
1567A
Domino Disaster
implementation
,
strings
800
x29763
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x126
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x336
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x932
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4040
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7723
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x13827
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x17151
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19225
1566A
Median Maximization
binary search
,
greedy
,
math
800
x22871
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x376
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1345
1562D2
Two Hundred Twenty One (hard version)
data structures
,
math
2200
x2083
1562D1
Two Hundred Twenty One (easy version)
data structures
,
dp
,
math
1700
x6214
1562C
Rings
constructive algorithms
,
math
1500
x12997
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19257
1562A
The Miracle and the Sleeper
greedy
,
math
800
x25235
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5474
1561C
Deep Down Below
binary search
,
greedy
,
sortings
1300
x13767
1561A
Simply Strange Sort
brute force
,
implementation
,
sortings
800
x16477
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4235
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5969
1560E
Polycarp and String Transformation
binary search
,
implementation
,
sortings
,
strings
1800
x7743
1560D
Make a Power of Two
greedy
,
math
,
strings
1300
x17773
1560C
Infinity Table
implementation
,
math
800
x26207
1560B
Who's Opposite?
math
800
x34927
1560A
Dislike of Threes
implementation
800
x56724
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2232
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2551
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13358
1559C
Mocha and Hiking
constructive algorithms
,
graphs
1200
x19896
1559B
Mocha and Red and Blue
dp
,
greedy
900
x22103
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x29381
1558F
Strange Sort
data structures
,
sortings
3300
x358
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x451
1558D
Top-Notch Insertions
combinatorics
,
data structures
2600
x935
1558C
Bottom-Tier Reversals
constructive algorithms
,
greedy
2000
x3186
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4671
1558A
Charmed by the Game
brute force
,
math
1300
x10955
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x699
1557D
Ezzat and Grid
data structures
,
dp
,
greedy
2200
x2489
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8389
1557B
Moamen and k-subarrays
greedy
,
sortings
1100
x22978
1557A
Ezzat and Two Subsequences
brute force
,
math
,
sortings
800
x27581
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x327
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x310
1556F
Sports Betting
bitmasks
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
2500
x1186
1556E
Equilibrium
data structures
,
dp
,
greedy
2200
x2524
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6632
1556C
Compressed Bracket Sequence
brute force
,
implementation
1800
x5683
1556B
Take Your Places!
implementation
1300
x12485
1556A
A Variety of Operations
math
800
x17934
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x833
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3891
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x11894
1555C
Coin Rows
brute force
,
constructive algorithms
,
dp
,
implementation
1300
x21076
1555B
Two Tables
brute force
1300
x15741
1555A
PizzaForces
brute force
,
math
900
x27490
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1191
1554D
Diane
constructive algorithms
,
greedy
,
strings
1800
x9181
1554C
Mikasa
binary search
,
bitmasks
,
greedy
,
implementation
1800
x8647
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12529
1554A
Cherry
greedy
800
x28750
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x198
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x676
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x983
1553F
Pairwise Modulo
data structures
,
math
2300
x2126
1553E
Permutation Shift
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
math
2100
x3260
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13431
1553C
Penalty
bitmasks
,
brute force
,
dp
,
greedy
1200
x17455
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13898
1553A
Digits Sum
math
,
number theory
800
x30379
1552I
Organizing a Music Festival
dfs and similar
,
math
3400
x122
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x327
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x459
1552F
Telepanting
binary search
,
data structures
,
dp
,
sortings
2200
x2815
1552E
Colors and Intervals
constructive algorithms
,
data structures
,
greedy
,
sortings
2300
x1788
1552D
Array Differentiation
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
math
1800
x6760
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5807
1552B
Running for Gold
combinatorics
,
graphs
,
greedy
,
sortings
1500
x15103
1552A
Subsequence Permutation
sortings
,
strings
800
x23594
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