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When submitting a solution in C++, please select either C++14 (GCC 6-32) or C++17 (GCC 7-32) as your compiler.
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Before contest
Codeforces Round 935 (Div. 3)
01:15:36
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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
1583B
Omkar and Heavenly Tree
constructive algorithms
,
trees
1200
x11848
1583A
Windblume Ode
math
,
number theory
800
x13499
1582G
Kuzya and Homework
data structures
,
number theory
2600
x554
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1681
1582F1
Korney Korneevich and XOR (easy version)
bitmasks
,
dp
,
greedy
1800
x5127
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3538
1582D
Vupsen, Pupsen and 0
constructive algorithms
,
math
1600
x9986
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x13927
1582B
Luntik and Subsequences
combinatorics
,
math
900
x18225
1582A
Luntik and Concerts
math
800
x18176
1581B
Diameter of Graph
constructive algorithms
,
graphs
,
greedy
,
math
1200
x10932
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13183
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x128
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x61
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x742
1580C
Train Maintenance
brute force
,
data structures
,
implementation
2200
x1629
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x954
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3516
1579G
Minimal Coverage
dp
2200
x2220
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4514
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6267
1579E1
Permutation Minimization by Deque
constructive algorithms
,
greedy
,
math
1000
x20629
1579D
Productive Meeting
constructive algorithms
,
graphs
,
greedy
1400
x15058
1579C
Ticks
greedy
,
implementation
1500
x10179
1579B
Shifting Sort
implementation
,
sortings
1100
x17691
1579A
Casimir's String Solitaire
math
,
strings
800
x37402
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x429
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1042
1578K
Kingdom of Islands
brute force
,
graphs
,
implementation
2800
x341
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x208
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1578H
Higher Order Functions
implementation
,
strings
1700
x1931
1578G
Game of Chance
math
,
probabilities
3500
x31
1578F
Framing Pictures
geometry
2900
x148
1578E
Easy Scheduling
implementation
,
math
1200
x3689
1578D
Dragon Curve
3200
x43
1578C
Cactus Lady and her Cing
3500
x7
1578B
Building Forest Trails
data structures
,
dsu
2800
x316
1578A
Anti-Tetris
constructive algorithms
,
graphs
,
shortest paths
2800
x315
1576A
Communication Routing Challenge
*special problem
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x229
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1210
1575K
Knitting Batik
implementation
,
math
2200
x613
1575J
Jeopardy of Dropped Balls
binary search
,
brute force
,
dsu
,
implementation
1500
x3576
1575I
Illusions of the Desert
data structures
,
trees
2300
x825
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x560
1575G
GCD Festival
math
,
number theory
2200
x632
1575F
Finding Expected Value
math
2900
x99
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x300
1575D
Divisible by Twenty-Five
brute force
,
dfs and similar
,
dp
1800
x2360
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x149
1575B
Building an Amusement Park
binary search
,
geometry
2300
x447
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4152
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x565
1574E
Coloring
combinatorics
,
constructive algorithms
,
implementation
,
math
2500
x853
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4294
1574C
Slay the Dragon
binary search
,
greedy
,
sortings
,
ternary search
1300
x16305
1574B
Combinatorics Homework
combinatorics
,
greedy
,
math
1100
x16894
1574A
Regular Bracket Sequences
constructive algorithms
800
x21172
1573B
Swaps
greedy
,
math
,
sortings
1400
x14078
1573A
Countdown
greedy
800
x20876
1572F
Stations
data structures
3400
x233
1572E
Polygon
binary search
,
dp
,
geometry
3000
x258
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x454
1572C
Paint
dp
,
greedy
2700
x1375
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1726
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8407
1571J
Two Railroads
*special problem
3000
x35
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x53
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x43
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x71
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x175
1571E
Fix the String
*special problem
,
bitmasks
,
dp
,
greedy
1700
x318
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x313
1571C
Rhyme
*special problem
,
implementation
1800
x356
1571B
Epic Novel
*special problem
,
math
1300
x671
1571A
Sequence of Comparisons
*special problem
800
x1226
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x210
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x774
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4203
1569C
Jury Meeting
combinatorics
,
math
1500
x11493
1569B
Chess Tournament
constructive algorithms
1000
x18495
1569A
Balanced Substring
implementation
800
x25138
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x718
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x3469
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4361
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11731
1567B
MEXor Mixup
bitmasks
,
greedy
1000
x20943
1567A
Domino Disaster
implementation
,
strings
800
x29458
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x101
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x320
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x914
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x3977
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7647
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x13651
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x16832
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x18906
1566A
Median Maximization
binary search
,
greedy
,
math
800
x22503
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x371
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1317
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