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Before contest
Codeforces Round 1101 (Div. 2)
01:22:55
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constructive algorithms
combine-tags-by-or
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2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x33322
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x1278
1912C
Cactus Transformation
constructive algorithms
3300
x74
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x110
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1685
1909C
Heavy Intervals
constructive algorithms
,
data structures
,
dsu
,
greedy
,
math
,
sortings
1400
x13237
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x31619
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x2343
1907D
Jumping Through Segments
binary search
,
constructive algorithms
1400
x23971
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x23221
1906L
Palindromic Parentheses
constructive algorithms
2500
x769
1906E
Merge Not Sort
constructive algorithms
,
dp
1900
x2459
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x830
1905A
Constructive Problems
constructive algorithms
,
math
800
x24466
1904D2
Set To Max (Hard Version)
constructive algorithms
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
sortings
1800
x5752
1904D1
Set To Max (Easy Version)
brute force
,
constructive algorithms
,
greedy
1600
x8678
1903C
Theofanis' Nightmare
constructive algorithms
,
greedy
1400
x14552
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x14883
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x17141
1902A
Binary Imbalance
constructive algorithms
800
x23314
1901C
Add, Divide and Floor
constructive algorithms
,
greedy
,
math
1400
x14304
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x65908
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x9568
1898C
Colorful Grid
constructive algorithms
1700
x6534
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x429
1896F
Bracket Xoring
constructive algorithms
,
greedy
,
implementation
,
math
2600
x965
1896C
Matching Arrays
binary search
,
constructive algorithms
,
greedy
,
sortings
1400
x11658
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x7163
1894B
Two Out of Three
constructive algorithms
1000
x18159
1893D
Colorful Constructive
constructive algorithms
,
data structures
,
greedy
2600
x1094
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x11583
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x20670
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x20577
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x18785
1890A
Doremy's Paint 3
constructive algorithms
800
x58530
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x8654
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x15367
1887F
Minimum Segments
constructive algorithms
3400
x247
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x505
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x2304
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1859
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x27783
1882E2
Two Permutations (Hard Version)
constructive algorithms
3100
x379
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x1233
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x17455
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1583
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x25121
1878B
Aleksa and Stack
constructive algorithms
,
math
800
x34296
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x350
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2726
1873G
ABBC or BACB
constructive algorithms
,
greedy
1500
x16978
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x20259
1869A
Make It Zero
constructive algorithms
900
x40940
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x113
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x383
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2767
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x8352
1868A
Fill in the Matrix
constructive algorithms
,
implementation
1300
x13636
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x511
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x3768
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x4351
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x6894
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x12694
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x18682
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x21156
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x315
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x7664
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x15319
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x16688
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x21453
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x128
1863D
Two-Colored Dominoes
constructive algorithms
,
greedy
1400
x10804
1862E
Kolya and Movie Theatre
constructive algorithms
,
data structures
,
greedy
1600
x12847
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x19923
1862B
Sequence Game
constructive algorithms
800
x56378
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x24112
1861A
Prime Deletion
constructive algorithms
,
math
800
x25985
1860A
Not a Substring
constructive algorithms
,
strings
900
x23640
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x44657
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x55767
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x25578
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x529
1854A2
Dual (Hard Version)
constructive algorithms
,
math
1900
x7895
1854A1
Dual (Easy Version)
constructive algorithms
,
math
1400
x15929
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x227
1852D
Miriany and Matchstick
constructive algorithms
,
dp
,
greedy
2800
x606
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x5481
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x31574
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x10363
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x3740
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x22576
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x21555
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x48635
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x1190
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x485
1844F1
Min Cost Permutation (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
math
2600
x914
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x2167
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x13882
1844B
Permutations & Primes
constructive algorithms
,
math
1000
x20300
1844A
Subtraction Game
constructive algorithms
,
games
800
x25989
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