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Before contest
Codeforces Round 953 (Div. 2)
13:18:12
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constructive algorithms
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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
1917A
Least Product
constructive algorithms
,
math
800
x24509
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x421
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x8039
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16971
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x24178
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24841
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x28997
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x802
1912C
Cactus Transformation
constructive algorithms
3300
x47
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x63
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1277
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x10262
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x14690
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1788
1907D
Jumping Through Segments
binary search
,
constructive algorithms
1400
x12432
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x18859
1906L
Palindromic Parentheses
constructive algorithms
2500
x441
1906E
Merge Not Sort
constructive algorithms
,
dp
1900
x1347
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x462
1905A
Constructive Problems
constructive algorithms
,
math
800
x22110
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x3953
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x5959
1903C
Theofanis' Nightmare
constructive algorithms
,
greedy
1400
x10715
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11722
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x12646
1902A
Binary Imbalance
constructive algorithms
800
x20088
1901C
Add, Divide and Floor
constructive algorithms
,
greedy
,
math
1400
x10972
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x23173
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6907
1898C
Colorful Grid
constructive algorithms
1700
x5054
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x314
1896F
Bracket Xoring
constructive algorithms
,
greedy
,
implementation
,
math
2600
x664
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x8896
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5677
1894B
Two Out of Three
constructive algorithms
1000
x15013
1893D
Colorful Constructive
constructive algorithms
,
data structures
,
greedy
2600
x835
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8257
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11746
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x18638
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x16884
1890A
Doremy's Paint 3
constructive algorithms
800
x22913
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x6901
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x12300
1887F
Minimum Segments
constructive algorithms
3400
x119
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x339
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1606
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1360
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x24878
1882E2
Two Permutations (Hard Version)
constructive algorithms
3100
x287
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x970
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14649
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1195
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x21493
1878B
Aleksa and Stack
constructive algorithms
,
math
800
x30307
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x258
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2172
1873G
ABBC or BACB
constructive algorithms
,
greedy
1500
x12116
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x18666
1869A
Make It Zero
constructive algorithms
900
x19399
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x74
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x252
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2299
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6593
1868A
Fill in the Matrix
constructive algorithms
,
implementation
1300
x11409
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x402
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x3034
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3580
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5458
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10766
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x16156
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x19477
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x255
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6445
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12867
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14917
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x19922
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x71
1863D
Two-Colored Dominoes
constructive algorithms
,
greedy
1400
x9104
1862E
Kolya and Movie Theatre
constructive algorithms
,
data structures
,
greedy
1600
x9856
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x16335
1862B
Sequence Game
constructive algorithms
800
x29595
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x20499
1861A
Prime Deletion
constructive algorithms
,
math
800
x23360
1860A
Not a Substring
constructive algorithms
,
strings
900
x21068
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x24968
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x30082
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22249
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x386
1854A2
Dual (Hard Version)
constructive algorithms
,
math
1900
x6771
1854A1
Dual (Easy Version)
constructive algorithms
,
math
1400
x13553
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x162
1852D
Miriany and Matchstick
constructive algorithms
,
dp
,
greedy
2800
x433
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4232
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x28903
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x7918
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x2949
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x18592
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x18193
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x25187
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x661
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