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Before contest
Codeforces Round #792 (Div. 1)
2 days
Before contest
Codeforces Round #792 (Div. 2)
2 days
→ Filter Problems
Difficulty:
—
divide and conquer
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
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x176
1676H2
Maximum Crossings (Hard Version)
data structures
,
divide and conquer
,
sortings
1500
x4671
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x488
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x1703
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x898
1663B
Mike's Sequence
divide and conquer
,
implementation
,
math
x2557
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x36
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x597
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x181
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x527
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x141
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x213
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x691
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x705
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x365
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x171
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x448
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x458
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x334
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x1446
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x175
1583F
Defender of Childhood Dreams
bitmasks
,
constructive algorithms
,
divide and conquer
2500
x863
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x454
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x724
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x2709
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x118
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x426
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x425
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x120
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x7005
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x4084
1543E
The Final Pursuit
bitmasks
,
constructive algorithms
,
divide and conquer
,
graphs
,
greedy
,
math
2700
x326
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x10366
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x1300
1523G
Try Booking
data structures
,
divide and conquer
3200
x309
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x85
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2109
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x1669
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x15420
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x2281
1470F
Strange Covering
divide and conquer
3500
x52
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x701
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x7461
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x2615
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x1109
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1278
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1018
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x1735
1425B
Blue and Red of Our Faculty!
divide and conquer
,
dp
2600
x202
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x364
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x41
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x3776
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x979
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x3239
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x1928
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x4021
1386C
Joker
*special problem
,
bitmasks
,
data structures
,
divide and conquer
,
dsu
2800
x252
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x14517
1379F2
Chess Strikes Back (hard version)
data structures
,
divide and conquer
2800
x284
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x257
1375H
Set Merging
constructive algorithms
,
divide and conquer
3300
x245
1373G
Pawns
data structures
,
divide and conquer
,
greedy
2600
x601
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x12225
1372F
Omkar and Modes
binary search
,
divide and conquer
,
interactive
2700
x314
1371F
Raging Thunder
data structures
,
divide and conquer
,
implementation
2800
x380
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x838
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x2611
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x125
1316F
Battalion Strength
data structures
,
divide and conquer
,
probabilities
2800
x379
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x3125
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x490
1295E
Permutation Separation
data structures
,
divide and conquer
2200
x1965
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x5905
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1425
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x245
1261F
Xor-Set
bitmasks
,
divide and conquer
,
math
3100
x218
1257G
Divisor Set
divide and conquer
,
fft
,
greedy
,
math
,
number theory
2600
x451
1250M
SmartGarden
constructive algorithms
,
divide and conquer
2500
x307
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x3640
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x836
1218E
Product Tuples
divide and conquer
,
fft
2500
x273
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x238
1217F
Forced Online Queries Problem
data structures
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x364
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x4751
1192B
Dynamic Diameter
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
trees
x555
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x1955
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x487
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x363
1179E
Alesya and Discrete Math
divide and conquer
,
interactive
3200
x102
1177B
Digits Sequence (Hard Edition)
binary search
,
divide and conquer
,
implementation
1800
x1959
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x209
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x983
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x2138
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1014
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x8373
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2021
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x2574
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x5458
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x680
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x285
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