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Before contest
Codeforces Round 955 (Div. 2, with prizes from NEAR!)
25:54:02
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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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Problems
#
Name
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4390
1574C
Slay the Dragon
binary search
,
greedy
,
sortings
,
ternary search
1300
x16701
1574B
Combinatorics Homework
combinatorics
,
greedy
,
math
1100
x17116
1574A
Regular Bracket Sequences
constructive algorithms
800
x21511
1573B
Swaps
greedy
,
math
,
sortings
1400
x14259
1573A
Countdown
greedy
800
x20971
1572F
Stations
data structures
3400
x243
1572E
Polygon
binary search
,
dp
,
geometry
3000
x281
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x483
1572C
Paint
dp
,
greedy
2700
x1403
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1764
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8660
1571J
Two Railroads
*special problem
3000
x38
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x56
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x46
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x74
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x180
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x330
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x326
1571C
Rhyme
*special problem
,
implementation
1800
x371
1571B
Epic Novel
*special problem
,
math
1300
x694
1571A
Sequence of Comparisons
*special problem
800
x1268
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x232
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
x4319
1569C
Jury Meeting
combinatorics
,
math
1500
x11769
1569B
Chess Tournament
constructive algorithms
1000
x18663
1569A
Balanced Substring
implementation
800
x25351
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x734
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x3548
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4431
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11935
1567B
MEXor Mixup
bitmasks
,
greedy
1000
x22013
1567A
Domino Disaster
implementation
,
strings
800
x29788
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x127
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x337
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x933
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4049
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7733
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x13842
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x17188
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19261
1566A
Median Maximization
binary search
,
greedy
,
math
800
x22908
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x376
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1346
1562D2
Two Hundred Twenty One (hard version)
data structures
,
math
2200
x2084
1562D1
Two Hundred Twenty One (easy version)
data structures
,
dp
,
math
1700
x6225
1562C
Rings
constructive algorithms
,
math
1500
x13022
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19276
1562A
The Miracle and the Sleeper
greedy
,
math
800
x25246
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5485
1561C
Deep Down Below
binary search
,
greedy
,
sortings
1300
x13847
1561A
Simply Strange Sort
brute force
,
implementation
,
sortings
800
x16483
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4245
1560F1
Nearest Beautiful Number (easy version)
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
1900
x5981
1560E
Polycarp and String Transformation
binary search
,
implementation
,
sortings
,
strings
1800
x7763
1560D
Make a Power of Two
greedy
,
math
,
strings
1300
x17811
1560C
Infinity Table
implementation
,
math
800
x26243
1560B
Who's Opposite?
math
800
x34989
1560A
Dislike of Threes
implementation
800
x56956
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2237
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2558
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13394
1559C
Mocha and Hiking
constructive algorithms
,
graphs
1200
x19925
1559B
Mocha and Red and Blue
dp
,
greedy
900
x22122
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x29532
1558F
Strange Sort
data structures
,
sortings
3300
x364
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
x3188
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4674
1558A
Charmed by the Game
brute force
,
math
1300
x10960
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x701
1557D
Ezzat and Grid
data structures
,
dp
,
greedy
2200
x2491
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x8414
1557B
Moamen and k-subarrays
greedy
,
sortings
1100
x23002
1557A
Ezzat and Two Subsequences
brute force
,
math
,
sortings
800
x27600
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x330
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x312
1556F
Sports Betting
bitmasks
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
2500
x1190
1556E
Equilibrium
data structures
,
dp
,
greedy
2200
x2526
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6660
1556C
Compressed Bracket Sequence
brute force
,
implementation
1800
x5697
1556B
Take Your Places!
implementation
1300
x12498
1556A
A Variety of Operations
math
800
x17942
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x833
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3902
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x11940
1555C
Coin Rows
brute force
,
constructive algorithms
,
dp
,
implementation
1300
x21125
1555B
Two Tables
brute force
1300
x15777
1555A
PizzaForces
brute force
,
math
900
x27532
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1191
1554D
Diane
constructive algorithms
,
greedy
,
strings
1800
x9206
1554C
Mikasa
binary search
,
bitmasks
,
greedy
,
implementation
1800
x8666
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12548
1554A
Cherry
greedy
800
x28810
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x198
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x677
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x984
1553F
Pairwise Modulo
data structures
,
math
2300
x2127
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