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Before contest
Codeforces Round 941 (Div. 1)
45:55:40
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Before contest
Codeforces Round 941 (Div. 2)
45:55:40
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2-sat
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bitmasks
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combinatorics
constructive algorithms
data structures
dfs and similar
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dp
dsu
expression parsing
fft
flows
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geometry
graph matchings
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greedy
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Problems
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Name
476D
Dreamoon and Sets
constructive algorithms
,
greedy
,
math
1900
x4312
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4346
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4351
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x4360
1613D
MEX Sequences
dp
,
math
1900
x4427
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4595
1294E
Obtain a Permutation
greedy
,
implementation
,
math
1900
x4681
1898D
Absolute Beauty
greedy
,
math
1900
x4683
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x4734
1383B
GameGame
bitmasks
,
constructive algorithms
,
dp
,
games
,
greedy
,
math
1900
x4751
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4782
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4834
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x4862
803C
Maximal GCD
constructive algorithms
,
greedy
,
math
1900
x4903
1371E1
Asterism (Easy Version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
sortings
1900
x4947
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5049
1197D
Yet Another Subarray Problem
dp
,
greedy
,
math
1900
x5086
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5095
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5138
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5165
1543C
Need for Pink Slips
bitmasks
,
brute force
,
dfs and similar
,
implementation
,
math
,
probabilities
1900
x5179
1749D
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
1900
x5235
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5239
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5381
1490G
Old Floppy Drive
binary search
,
data structures
,
math
1900
x5457
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5468
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5527
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x5594
1545B
AquaMoon and Chess
combinatorics
,
math
1900
x5613
1700D
River Locks
binary search
,
dp
,
greedy
,
math
1900
x5817
1492D
Genius's Gambit
bitmasks
,
constructive algorithms
,
greedy
,
math
1900
x5919
1444B
Divide and Sum
combinatorics
,
math
,
sortings
1900
x6025
459C
Pashmak and Buses
combinatorics
,
constructive algorithms
,
math
1900
x6062
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6138
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6383
1656D
K-good
constructive algorithms
,
math
,
number theory
1900
x6574
1854A2
Dual (Hard Version)
constructive algorithms
,
math
1900
x6645
1360G
A/B Matrix
constructive algorithms
,
greedy
,
math
1900
x7371
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x7802
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8248
1348D
Phoenix and Science
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x8472
1400D
Zigzags
brute force
,
combinatorics
,
data structures
,
math
,
two pointers
1900
x9776
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x181
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x233
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x317
44D
Hyperdrive
math
1800
x688
48C
The Race
math
1800
x755
123B
Squares
math
1800
x1089
630M
Turn
geometry
,
math
1800
x1093
1402A
Fancy Fence
*special problem
,
data structures
,
dsu
,
implementation
,
math
,
sortings
1800
x1134
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1208
15B
Laser
math
1800
x1247
251B
Playing with Permutations
implementation
,
math
1800
x1249
201B
Guess That Car!
math
,
ternary search
1800
x1252
325B
Stadium and Games
binary search
,
math
1800
x1469
185B
Mushroom Scientists
math
,
ternary search
1800
x1594
83B
Doctor
binary search
,
math
,
sortings
1800
x1615
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1628
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1781
255D
Mr. Bender and Square
binary search
,
implementation
,
math
1800
x1929
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2078
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2086
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2104
846F
Random Query
data structures
,
math
,
probabilities
,
two pointers
1800
x2199
433C
Ryouko's Memory Note
implementation
,
math
,
sortings
1800
x2395
1725H
Hot Black Hot White
constructive algorithms
,
math
1800
x2494
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2513
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2533
77B
Falling Anvils
math
,
probabilities
1800
x2537
1267J
Just Arrange the Icons
greedy
,
implementation
,
math
1800
x2556
1250B
The Feast and the Bus
brute force
,
constructive algorithms
,
greedy
,
math
1800
x2558
513B2
Permutations
bitmasks
,
divide and conquer
,
math
1800
x2561
899D
Shovel Sale
constructive algorithms
,
math
1800
x2677
351A
Jeff and Rounding
dp
,
greedy
,
implementation
,
math
1800
x2680
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x2951
592C
The Big Race
math
1800
x3035
492D
Vanya and Computer Game
binary search
,
implementation
,
math
,
sortings
1800
x3114
963A
Alternating Sum
math
,
number theory
1800
x3219
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3242
991E
Bus Number
brute force
,
combinatorics
,
math
1800
x3400
917A
The Monster
dp
,
greedy
,
implementation
,
math
1800
x3421
1107D
Compression
dp
,
implementation
,
math
,
number theory
1800
x3669
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3674
1280B
Beingawesomeism
implementation
,
math
1800
x3750
813B
The Golden Age
brute force
,
math
1800
x3771
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3861
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3930
483B
Friends and Presents
binary search
,
math
1800
x3986
772A
Voltage Keepsake
binary search
,
math
1800
x4067
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4125
257C
View Angle
brute force
,
geometry
,
math
1800
x4186
7C
Line
math
,
number theory
1800
x4222
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4304
869C
The Intriguing Obsession
combinatorics
,
dp
,
math
1800
x4348
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4369
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4405
1195D2
Submarine in the Rybinsk Sea (hard edition)
combinatorics
,
math
,
number theory
1800
x4411
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4412
911D
Inversion Counting
brute force
,
math
1800
x4414
1016D
Vasya And The Matrix
constructive algorithms
,
flows
,
math
1800
x4421
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