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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
—
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
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Status
Standings
Custom test
Problems
#
Name
1857F
Sum and Product
binary search
,
data structures
,
math
1600
x11533
1857E
Power of Points
math
,
sortings
1500
x12445
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x19549
1857C
Assembly via Minimums
greedy
,
sortings
1200
x26043
1857B
Maximum Rounding
greedy
,
implementation
,
math
1100
x22996
1857A
Array Coloring
greedy
,
math
800
x48254
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1390
1856E1
PermuTree (easy version)
dfs and similar
,
dp
,
trees
1800
x5311
1856D
More Wrong
divide and conquer
,
interactive
2100
x3255
1856C
To Become Max
binary search
,
brute force
,
data structures
,
dp
1600
x12353
1856B
Good Arrays
implementation
,
math
900
x24307
1856A
Tales of a Sort
implementation
800
x26502
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x26745
1855A
Dalton the Teacher
greedy
,
math
800
x27948
1854F
Mark and Spaceship
brute force
,
dp
3500
x120
1854E
Game Bundles
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
3000
x431
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x543
1854C
Expected Destruction
combinatorics
,
dp
,
math
,
probabilities
2500
x1497
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3527
1854A2
Dual (Hard Version)
constructive algorithms
,
math
1900
x6999
1854A1
Dual (Easy Version)
constructive algorithms
,
math
1400
x14109
1853B
Fibonaccharsis
binary search
,
brute force
,
math
1200
x17423
1853A
Desorting
brute force
,
greedy
,
math
800
x31911
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x106
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x166
1852D
Miriany and Matchstick
constructive algorithms
,
dp
,
greedy
2800
x459
1852C
Ina of the Mountain
data structures
,
dp
,
greedy
,
math
2400
x1562
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4469
1852A
Ntarsis' Set
binary search
,
math
,
number theory
1800
x8055
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x3225
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5834
1851E
Nastya and Potions
dfs and similar
,
dp
,
graphs
,
sortings
1500
x10335
1851D
Prefix Permutation Sums
implementation
,
math
1300
x15211
1851C
Tiles Comeback
greedy
1000
x23373
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x29272
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x29507
1850H
The Third Letter
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1700
x8200
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x12396
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x19139
1850E
Cardboard for Pictures
binary search
,
geometry
,
implementation
,
math
1100
x23220
1850D
Balanced Round
brute force
,
greedy
,
implementation
,
sortings
900
x36887
1850C
Word on the Paper
implementation
,
strings
800
x44241
1850B
Ten Words of Wisdom
implementation
,
sortings
800
x42842
1850A
To My Critics
implementation
,
sortings
800
x56052
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x720
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1648
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x8503
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x10523
1849B
Monsters
greedy
,
math
,
sortings
1000
x25802
1849A
Morning Sandwich
implementation
,
math
800
x27961
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1583
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x789
1848D
Vika and Bonuses
binary search
,
brute force
,
math
,
ternary search
2200
x2619
1848C
Vika and Price Tags
math
,
number theory
1800
x6298
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x14983
1848A
Vika and Her Friends
games
,
math
900
x16831
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x893
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x329
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3782
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12885
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19986
1847A
The Man who became a God
greedy
,
sortings
800
x21996
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4387
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x3116
1846E2
Rudolf and Snowflakes (hard version)
binary search
,
brute force
,
implementation
,
math
1800
x7029
1846E1
Rudolf and Snowflakes (simple version)
brute force
,
implementation
,
math
1300
x16918
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x19385
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x18919
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26868
1846A
Rudolph and Cut the Rope
implementation
,
math
800
x32482
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x371
1845E
Boxes and Balls
dp
,
implementation
,
math
2500
x1322
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7824
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x14265
1845B
Come Together
geometry
,
implementation
,
math
900
x21601
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x27567
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x137
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x726
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x401
1844F1
Min Cost Permutation (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
math
2600
x779
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x1877
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x12291
1844C
Particles
dp
,
greedy
,
implementation
,
math
1300
x15663
1844B
Permutations & Primes
constructive algorithms
,
math
1000
x18227
1844A
Subtraction Game
constructive algorithms
,
games
800
x24531
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1600
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x5310
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x12341
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x18045
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x33037
1843B
Long Long
greedy
,
math
,
two pointers
800
x28980
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x34211
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x119
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x669
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x1050
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1326
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1623
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x4082
1842C
Tenzing and Balls
dp
1500
x12805
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x17088
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