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Codeforces Round (Div. 2)
3 days
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Difficulty:
—
implementation
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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Custom test
Problems
#
Name
1790C
Premutation
brute force
,
implementation
,
math
1000
x23325
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x36200
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x529
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x779
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1612
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8265
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15949
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x809
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19558
1788A
One and Two
brute force
,
implementation
,
math
800
x28600
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x640
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3324
1786A2
Alternating Deck (hard version)
implementation
800
x11290
1786A1
Non-alternating Deck (easy version)
implementation
800
x13680
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x423
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4276
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1281
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7274
1778A
Flip Flop Sum
greedy
,
implementation
800
x23918
1775E
The Human Equation
greedy
,
implementation
2100
x3087
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19430
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x651
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1031
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7598
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x462
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x742
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1294
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2281
1772B
Matrix Rotation
brute force
,
implementation
800
x28584
1772A
A+B?
implementation
800
x45412
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x669
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3728
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1324
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x13765
1767A
Cut the Triangle
implementation
800
x20297
1766C
Hamiltonian Wall
dp
,
implementation
1300
x13313
1766B
Notepad#
implementation
1000
x20577
1766A
Extremely Round
brute force
,
implementation
800
x24874
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x569
1765I
Infinite Chess
implementation
,
shortest paths
2800
x184
1765H
Hospital Queue
binary search
,
graphs
,
greedy
,
implementation
2200
x1204
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1987
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x14285
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16602
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x13168
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22915
1760C
Advantage
data structures
,
implementation
,
sortings
800
x35857
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x42845
1760A
Medium Number
implementation
,
sortings
800
x55849
1759A
Yes-Yes?
implementation
,
strings
800
x29312
1750C
Complementary XOR
constructive algorithms
,
implementation
1400
x9391
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x16108
1750A
Indirect Sort
constructive algorithms
,
implementation
,
math
800
x16921
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13641
1749A
Cowardly Rooks
greedy
,
implementation
800
x22163
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10744
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x14716
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x91
1746C
Permutation Operations
constructive algorithms
,
greedy
,
implementation
,
math
1300
x12584
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x25484
1744B
Even-Odd Increments
implementation
,
math
800
x23149
1744A
Number Replacement
greedy
,
implementation
800
x26731
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x26377
1742C
Stripes
implementation
900
x31816
1742B
Increasing
greedy
,
implementation
,
sortings
800
x45741
1742A
Sum
implementation
800
x67314
1741A
Compare T-Shirt Sizes
implementation
,
implementation
,
strings
800
x30236
1739A
Immobile Knight
implementation
800
x22438
1738A
Glory Addicts
greedy
,
implementation
,
sortings
800
x13436
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1821
1737C
Ela and Crickets
constructive algorithms
,
games
,
implementation
,
math
1500
x5634
1737B
Ela's Fitness and the Luxury Number
binary search
,
implementation
,
math
1300
x9267
1737A
Ela Sorting Books
greedy
,
implementation
,
strings
900
x10015
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2422
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9693
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8457
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2491
1732B
Ugu
brute force
,
dp
,
greedy
,
implementation
900
x14613
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14643
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x12203
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x24451
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x82
1722F
L-shapes
dfs and similar
,
implementation
1700
x6686
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10353
1722C
Word Game
data structures
,
implementation
800
x30042
1722B
Colourblindness
implementation
800
x44238
1722A
Spell Check
implementation
800
x48366
1721B
Deadly Laser
implementation
1000
x21731
1721A
Image
greedy
,
implementation
800
x26764
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x749
1720C
Corners
greedy
,
implementation
1200
x16496
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x13003
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x105
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2920
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x521
1717B
Madoka and Underground Competitions
constructive algorithms
,
implementation
1100
x14578
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x4079
1715C
Monoblock
combinatorics
,
data structures
,
implementation
,
math
1700
x8464
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x3137
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x29710
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