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Before contest
Codeforces Round (Div. 3)
4 days
→ Filter Problems
Difficulty:
—
data structures
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
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x318
1583G
Omkar and Time Travel
data structures
,
math
3000
x431
1583C
Omkar and Determination
data structures
,
dp
1700
x6857
1582G
Kuzya and Homework
data structures
,
number theory
2600
x569
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3640
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14938
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x72
1580C
Train Maintenance
brute force
,
data structures
,
implementation
2200
x1704
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3599
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6509
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x224
1578B
Building Forest Trails
data structures
,
dsu
2800
x322
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x242
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1309
1575I
Illusions of the Desert
data structures
,
trees
2300
x852
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x322
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x159
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4291
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4397
1572F
Stations
data structures
3400
x250
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8694
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x57
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x74
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4324
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x3554
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x337
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x937
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7746
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x13865
1562D2
Two Hundred Twenty One (hard version)
data structures
,
math
2200
x2089
1562D1
Two Hundred Twenty One (easy version)
data structures
,
dp
,
math
1700
x6238
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5509
1558F
Strange Sort
data structures
,
sortings
3300
x367
1558D
Top-Notch Insertions
combinatorics
,
data structures
2600
x937
1557D
Ezzat and Grid
data structures
,
dp
,
greedy
2200
x2499
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x313
1556E
Equilibrium
data structures
,
dp
,
greedy
2200
x2537
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x835
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3929
1553F
Pairwise Modulo
data structures
,
math
2300
x2133
1552F
Telepanting
binary search
,
data structures
,
dp
,
sortings
2200
x2835
1552E
Colors and Intervals
constructive algorithms
,
data structures
,
greedy
,
sortings
2300
x1798
1551B2
Wonderful Coloring - 2
binary search
,
constructive algorithms
,
data structures
,
greedy
1400
x15243
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x643
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x349
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9497
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5652
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x14110
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x106
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x81
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x76
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x268
1539F
Strange Array
data structures
,
greedy
,
sortings
2600
x846
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x932
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2845
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x27632
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x5068
1536D
Omkar and Medians
data structures
,
greedy
,
implementation
2000
x4612
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13805
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x445
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2664
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7584
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x542
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x82
1533E
Chess Team Forming
*special problem
,
binary search
,
data structures
,
greedy
x274
1533C
Sweets
*special problem
,
data structures
,
implementation
x469
1530H
Turing's Award
data structures
,
dp
3400
x148
1528C
Trees of Tranquillity
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2528
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x2172
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2374
1526C2
Potions (Hard Version)
data structures
,
greedy
1600
x21663
1526C1
Potions (Easy Version)
brute force
,
data structures
,
dp
,
greedy
1500
x21744
1525C
Robot Collisions
data structures
,
greedy
,
implementation
,
sortings
2000
x4365
1523H
Hopping Around the Array
data structures
,
dp
3500
x236
1523G
Try Booking
data structures
,
divide and conquer
3200
x406
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8655
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1832
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2937
1520D
Same Differences
data structures
,
hashing
,
math
1200
x44539
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x16366
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x959
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4171
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x239
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x222
1515C
Phoenix and Towers
constructive algorithms
,
data structures
,
greedy
1400
x16743
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4147
1513F
Swapping Problem
brute force
,
constructive algorithms
,
data structures
,
sortings
2500
x1208
1512D
Corrupted Array
constructive algorithms
,
data structures
,
greedy
1200
x22073
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x713
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x422
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x22781
1508F
Optimal Encoding
brute force
,
data structures
3500
x120
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x331
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1440
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4146
1506D
Epic Transformation
constructive algorithms
,
data structures
,
greedy
1400
x21190
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x137
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x983
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3245
1500E
Subset Trick
binary search
,
data structures
3300
x215
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