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Before contest
Codeforces Round #792 (Div. 1)
3 days
Before contest
Codeforces Round #792 (Div. 2)
3 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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Problems
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Status
Standings
Custom test
Problems
#
Name
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x15412
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x8370
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x14513
1676H2
Maximum Crossings (Hard Version)
data structures
,
divide and conquer
,
sortings
1500
x4609
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x12220
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x10365
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x7458
768B
Code For 1
constructive algorithms
,
dfs and similar
,
divide and conquer
1600
x5123
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1293
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x8996
1111C
Creative Snap
binary search
,
brute force
,
divide and conquer
,
math
1700
x5517
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x7200
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x7002
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x4750
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x4366
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x4293
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2441
873D
Merge Sort
constructive algorithms
,
divide and conquer
1800
x2420
1177B
Digits Sequence (Hard Edition)
binary search
,
divide and conquer
,
implementation
1800
x1959
440C
One-Based Arithmetic
brute force
,
dfs and similar
,
divide and conquer
1800
x785
448C
Painting Fence
divide and conquer
,
dp
,
greedy
1900
x6342
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x5905
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x5452
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x4082
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x3639
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x3219
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x3122
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x2664
372B
Counting Rectangles is Fun
brute force
,
divide and conquer
,
dp
1900
x2206
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1574
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x797
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x4393
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x3238
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x1955
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1509
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x4804
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x3773
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x2613
576C
Points on Plane
constructive algorithms
,
divide and conquer
,
geometry
,
greedy
,
sortings
2100
x2411
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x2281
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2018
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x1863
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x1700
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x724
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x4020
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x2771
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x2709
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x2610
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x2570
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x2136
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2106
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2018
1295E
Permutation Separation
data structures
,
divide and conquer
2200
x1964
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1661
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1622
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x1564
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1424
627C
Package Delivery
data structures
,
divide and conquer
,
greedy
2200
x1029
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x674
413E
Maze 2D
data structures
,
divide and conquer
2200
x462
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2109
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x1928
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x1446
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1293
97B
Superset
constructive algorithms
,
divide and conquer
2300
x661
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x5265
1000F
One Occurrence
data structures
,
divide and conquer
2400
x2149
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x1734
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x1699
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x1698
786C
Till I Collapse
data structures
,
divide and conquer
2400
x1683
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x1669
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1311
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1206
1096G
Lucky Tickets
divide and conquer
,
dp
,
fft
2400
x1049
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1014
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x915
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x704
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x680
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x665
161C
Abracadabra
divide and conquer
2400
x547
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x484
1218D
Xor Spanning Tree
divide and conquer
,
fft
,
graphs
2400
x238
868F
Yet Another Minimization Problem
divide and conquer
,
dp
2500
x1761
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x1299
1041F
Ray in the tube
data structures
,
divide and conquer
,
dp
,
math
2500
x1204
1100F
Ivan and Burgers
data structures
,
divide and conquer
,
greedy
,
math
2500
x1159
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1018
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1008
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x983
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x979
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x898
1583F
Defender of Childhood Dreams
bitmasks
,
constructive algorithms
,
divide and conquer
2500
x863
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x685
678F
Lena and Queries
data structures
,
divide and conquer
,
geometry
2500
x575
1186E
Vus the Cossack and a Field
divide and conquer
,
implementation
,
math
2500
x487
1423H
Virus
data structures
,
divide and conquer
,
dsu
,
graphs
2500
x364
1181E1
A Story of One Country (Easy)
brute force
,
divide and conquer
,
sortings
2500
x363
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x357
101E
Candies and Stones
divide and conquer
,
dp
2500
x352
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