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2023 Post World Finals Online ICPC Challenge powered by Huawei
10 days
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Before contest
Codeforces Round 944 (Div. 4)
06:35:27
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Difficulty:
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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
#
Name
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x18833
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18361
1373D
Maximum Sum on Even Positions
divide and conquer
,
dp
,
greedy
,
implementation
1600
x14961
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x14479
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x13878
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x11600
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x10678
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10364
1676H2
Maximum Crossings (Hard Version)
data structures
,
divide and conquer
,
sortings
1500
x10040
459D
Pashmak and Parmida's problem
data structures
,
divide and conquer
,
sortings
1800
x9508
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9304
1461D
Divide and Summarize
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
sortings
1600
x8901
448C
Painting Fence
divide and conquer
,
dp
,
greedy
1900
x7823
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7638
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7338
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7040
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6784
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x6682
888E
Maximum Subsequence
bitmasks
,
divide and conquer
,
meet-in-the-middle
1800
x6635
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6618
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6583
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6298
1111C
Creative Snap
binary search
,
brute force
,
divide and conquer
,
math
1700
x6108
768B
Code For 1
constructive algorithms
,
dfs and similar
,
divide and conquer
1600
x5841
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5824
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x5723
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5503
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5484
1696D
Permutation Graph
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
shortest paths
1900
x5181
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5177
1400E
Clear the Multiset
data structures
,
divide and conquer
,
dp
,
greedy
2200
x5016
321E
Ciel and Gondolas
data structures
,
divide and conquer
,
dp
2600
x4504
1420C2
Pokémon Army (hard version)
data structures
,
divide and conquer
,
dp
,
greedy
,
implementation
2100
x4501
833B
The Bakery
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2200
x4499
817D
Imbalanced Array
data structures
,
divide and conquer
,
dsu
,
sortings
1900
x4401
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4181
1237C2
Balanced Removals (Harder)
binary search
,
constructive algorithms
,
divide and conquer
,
greedy
,
implementation
,
sortings
1900
x4133
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4086
1311F
Moving Points
data structures
,
divide and conquer
,
implementation
,
sortings
1900
x3942
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3809
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3682
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x3668
1000F
One Occurrence
data structures
,
divide and conquer
2400
x3517
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x3506
868F
Yet Another Minimization Problem
divide and conquer
,
dp
2500
x3419
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3392
1663B
Mike's Sequence
*special problem
,
divide and conquer
,
implementation
,
math
x3355
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3345
576C
Points on Plane
constructive algorithms
,
divide and conquer
,
geometry
,
greedy
,
sortings
2100
x3226
1175E
Minimal Segment Cover
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
implementation
,
trees
2200
x3200
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3152
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3129
1856D
More Wrong
divide and conquer
,
interactive
2100
x3085
873D
Merge Sort
constructive algorithms
,
divide and conquer
1800
x2997
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2990
1338C
Perfect Triples
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
math
2200
x2982
1482E
Skyline Photo
data structures
,
divide and conquer
,
dp
2100
x2941
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2876
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x2752
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x2737
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2703
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2666
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2645
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2579
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x2571
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2564
786C
Till I Collapse
data structures
,
divide and conquer
2400
x2520
372B
Counting Rectangles is Fun
brute force
,
divide and conquer
,
dp
1900
x2518
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2494
1177B
Digits Sequence (Hard Edition)
binary search
,
divide and conquer
,
implementation
1800
x2397
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2363
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2363
1295E
Permutation Separation
data structures
,
divide and conquer
2200
x2342
526F
Pudding Monsters
data structures
,
divide and conquer
3000
x2314
1408F
Two Different
constructive algorithms
,
divide and conquer
2300
x2261
1190D
Tokitsukaze and Strange Rectangle
data structures
,
divide and conquer
,
sortings
,
two pointers
2000
x2214
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2173
1428F
Fruit Sequences
binary search
,
data structures
,
divide and conquer
,
dp
,
two pointers
2400
x2164
1100F
Ivan and Burgers
data structures
,
divide and conquer
,
greedy
,
math
2500
x2119
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2116
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x2088
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2043
981E
Addition on Segments
bitmasks
,
data structures
,
divide and conquer
,
dp
2200
x1998
875D
High Cry
binary search
,
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
2200
x1980
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x1948
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1941
1442D
Sum
data structures
,
divide and conquer
,
dp
,
greedy
2800
x1926
715C
Digit Tree
dfs and similar
,
divide and conquer
,
dsu
,
trees
2700
x1923
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x1915
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1889
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1813
1114F
Please, another Queries on Array?
bitmasks
,
data structures
,
divide and conquer
,
math
,
number theory
2400
x1810
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1792
1278E
Tests for problem D
constructive algorithms
,
dfs and similar
,
divide and conquer
,
trees
2200
x1737
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1730
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1730
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1706
1439C
Greedy Shopping
binary search
,
data structures
,
divide and conquer
,
greedy
,
implementation
2600
x1676
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1651
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1616
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