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Before contest
Codeforces Round 950 (Div. 3)
34:21:19
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Difficulty:
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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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Problems
#
Name
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6830
1899E
Queue Sort
greedy
,
implementation
,
sortings
1300
x14142
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12436
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x18531
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x18461
1899A
Game with Integers
games
,
math
,
number theory
800
x38996
1898F
Vova Escapes the Matrix
brute force
,
dfs and similar
,
divide and conquer
,
shortest paths
2600
x744
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2076
1898D
Absolute Beauty
greedy
,
math
1900
x4818
1898C
Colorful Grid
constructive algorithms
1700
x4997
1898B
Milena and Admirer
greedy
,
math
1500
x10655
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15203
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x94
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x83
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x312
1896F
Bracket Xoring
constructive algorithms
,
greedy
,
implementation
,
math
2600
x661
1896E
Permutation Sorting
data structures
,
sortings
2100
x2048
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5278
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x8787
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13641
1896A
Jagged Swaps
sortings
800
x19457
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x178
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x641
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1470
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5635
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x10230
1895B
Points and Minimum Distance
greedy
,
math
,
sortings
800
x19762
1895A
Treasure Chest
math
800
x23580
1894B
Two Out of Three
constructive algorithms
1000
x14891
1894A
Secret Sport
implementation
,
strings
800
x18227
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x181
1893D
Colorful Constructive
constructive algorithms
,
data structures
,
greedy
2600
x829
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2468
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8182
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x11416
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3427
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x779
1891D
Suspicious logarithms
binary search
,
brute force
,
math
1900
x3737
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11535
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x16118
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x18488
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x16773
1890A
Doremy's Paint 3
constructive algorithms
800
x22340
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x69
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x100
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x530
1889C2
Doremy's Drying Plan (Hard Version)
data structures
,
dp
2600
x898
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3050
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x6830
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x12186
1887F
Minimum Segments
constructive algorithms
3400
x113
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x337
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x828
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1598
1887B
Time Travel
binary search
,
graphs
,
shortest paths
1900
x2721
1886F
Diamond Theft
data structures
,
greedy
3300
x161
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1348
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3364
1886C
Decreasing String
implementation
,
strings
1600
x10414
1886B
Fear of the Dark
binary search
,
geometry
,
math
1200
x15334
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x24724
1885A
Deterministic Scheduling for Extended Reality over 5G and Beyond
*special problem
1884E
Hard Design
greedy
,
implementation
,
math
2800
x265
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2888
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5552
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x11821
1884A
Simple Design
brute force
,
greedy
,
math
800
x16594
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4932
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9422
1883F
You Are So Beautiful
data structures
1400
x8377
1883E
Look Back
bitmasks
,
greedy
1700
x7198
1883D
In Love
data structures
,
greedy
1500
x10188
1883C
Raspberries
dp
,
math
1000
x23319
1883B
Chemistry
strings
900
x27594
1883A
Morning
math
800
x24193
1882E2
Two Permutations (Hard Version)
constructive algorithms
3100
x287
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x967
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5042
1882C
Card Game
brute force
,
greedy
1500
x11456
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14468
1882A
Increasing Sequence
greedy
800
x24412
1881G
Anya and the Mysterious String
binary search
,
data structures
2000
x2203
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x6132
1881E
Block Sequence
dp
1500
x12039
1881D
Divide and Equalize
math
,
number theory
1300
x14901
1881C
Perfect Square
brute force
,
implementation
1200
x16032
1881B
Three Threadlets
math
900
x23940
1881A
Don't Try to Count
brute force
,
strings
800
x28081
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x475
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1192
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6703
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x15225
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x21362
1879A
Rigged!
greedy
800
x22275
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1105
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3834
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x11347
1878D
Reverse Madness
data structures
,
greedy
1600
x7689
1878C
Vasilije in Cacak
math
900
x29063
1878B
Aleksa and Stack
constructive algorithms
,
math
800
x30095
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