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Before contest
Codeforces Round 941 (Div. 1)
24:58:36
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Before contest
Codeforces Round 941 (Div. 2)
24:58:36
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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
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strings
ternary search
trees
two pointers
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Problems
#
Name
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x18439
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x14281
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1063
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2262
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6405
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3495
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x684
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x650
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7165
1866A
Ambitious Kid
math
800
x17713
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x267
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2459
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x6306
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12538
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x19728
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x554
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x1025
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2600
1863C
MEX Repetition
implementation
,
math
1100
x13313
1863B
Split Sort
greedy
,
math
,
sortings
1100
x14526
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2628
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x15930
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1601
1861A
Prime Deletion
constructive algorithms
,
math
800
x23028
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x262
1860B
Fancy Coins
binary search
,
brute force
,
greedy
,
math
1200
x15940
1859E
Maximum Monogonosity
brute force
,
dp
,
math
2500
x1653
1859C
Another Permutation Problem
brute force
,
dp
,
greedy
,
math
1200
x16252
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x24112
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x29067
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x21858
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10569
1858A
Buttons
games
,
greedy
,
math
800
x33941
1857F
Sum and Product
binary search
,
data structures
,
math
1600
x10336
1857E
Power of Points
math
,
sortings
1500
x11432
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x17565
1857B
Maximum Rounding
greedy
,
implementation
,
math
1100
x21985
1857A
Array Coloring
greedy
,
math
800
x43117
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1301
1856B
Good Arrays
implementation
,
math
900
x23009
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x23572
1855A
Dalton the Teacher
greedy
,
math
800
x27076
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x379
1854C
Expected Destruction
combinatorics
,
dp
,
math
,
probabilities
2500
x1388
1854A2
Dual (Hard Version)
constructive algorithms
,
math
1900
x6649
1854A1
Dual (Easy Version)
constructive algorithms
,
math
1400
x13292
1853B
Fibonaccharsis
binary search
,
brute force
,
math
1200
x16467
1853A
Desorting
brute force
,
greedy
,
math
800
x27740
1852C
Ina of the Mountain
data structures
,
dp
,
greedy
,
math
2400
x1445
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4126
1852A
Ntarsis' Set
binary search
,
math
,
number theory
1800
x7528
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5265
1851D
Prefix Permutation Sums
implementation
,
math
1300
x14296
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x28537
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x11129
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x16978
1850E
Cardboard for Pictures
binary search
,
geometry
,
implementation
,
math
1100
x20662
1849B
Monsters
greedy
,
math
,
sortings
1000
x22495
1849A
Morning Sandwich
implementation
,
math
800
x26930
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1442
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x738
1848D
Vika and Bonuses
binary search
,
brute force
,
math
,
ternary search
2200
x2505
1848C
Vika and Price Tags
math
,
number theory
1800
x5918
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x13280
1848A
Vika and Her Friends
games
,
math
900
x16171
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x849
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x313
1846E2
Rudolf and Snowflakes (hard version)
binary search
,
brute force
,
implementation
,
math
1800
x6555
1846E1
Rudolf and Snowflakes (simple version)
brute force
,
implementation
,
math
1300
x15269
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x18249
1846A
Rudolph and Cut the Rope
implementation
,
math
800
x31281
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x350
1845E
Boxes and Balls
dp
,
implementation
,
math
2500
x1258
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7284
1845B
Come Together
geometry
,
implementation
,
math
900
x20821
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x24409
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x129
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x637
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x367
1844F1
Min Cost Permutation (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
math
2600
x736
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11577
1844C
Particles
dp
,
greedy
,
implementation
,
math
1300
x14757
1844B
Permutations & Primes
constructive algorithms
,
math
1000
x17398
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1464
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4955
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x16956
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30950
1843B
Long Long
greedy
,
math
,
two pointers
800
x27927
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x555
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x917
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1524
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15553
1842A
Tenzing and Tsondu
games
,
math
800
x19415
1841E
Fill the Matrix
data structures
,
greedy
,
math
2200
x1873
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7270
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x893
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2212
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24409
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21408
1839A
The Good Array
greedy
,
implementation
,
math
800
x17062
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