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Codeforces Round #851 (Div. 2)
37:35:06
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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
1791C
Prepend and Append
implementation
,
two pointers
800
x24136
1791B
Following Directions
geometry
,
implementation
800
x26005
1791A
Codeforces Checking
implementation
,
strings
800
x28920
1790C
Premutation
brute force
,
implementation
,
math
1000
x15780
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x25231
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x458
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x2259
1786A2
Alternating Deck (hard version)
implementation
x8591
1786A1
Non-alternating Deck (easy version)
implementation
x10153
1784B
Letter Exchange
constructive algorithms
,
greedy
,
implementation
x2127
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x269
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x2959
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1081
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x4994
1778A
Flip Flop Sum
greedy
,
implementation
x18269
1775E
The Human Equation
greedy
,
implementation
2100
x2196
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x15914
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x444
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x813
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x5465
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x324
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x519
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x903
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x1470
1772B
Matrix Rotation
brute force
,
implementation
800
x22321
1772A
A+B?
implementation
800
x28445
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x511
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x2921
1769B1
Копирование файлов I
*special problem
,
brute force
,
implementation
,
math
1000
x1104
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x10294
1767A
Cut the Triangle
implementation
800
x17737
1766C
Hamiltonian Wall
dp
,
implementation
1300
x9955
1766B
Notepad#
implementation
1000
x15614
1766A
Extremely Round
brute force
,
implementation
800
x18822
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x415
1765I
Infinite Chess
implementation
,
shortest paths
2800
x115
1765H
Hospital Queue
binary search
,
graphs
,
greedy
,
implementation
2200
x799
1763D
Valid Bitonic Permutations
combinatorics
,
dp
,
implementation
,
math
,
number theory
2200
x1526
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x10125
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x12941
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x10719
1760D
Challenging Valleys
implementation
,
two pointers
1000
x16800
1760C
Advantage
data structures
,
implementation
,
sortings
800
x25877
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x29984
1760A
Medium Number
implementation
,
sortings
800
x33857
1759A
Yes-Yes?
implementation
,
strings
800
x22428
1750C
Complementary XOR
constructive algorithms
,
implementation
1400
x7547
1750B
Maximum Substring
brute force
,
greedy
,
implementation
800
x14511
1750A
Indirect Sort
constructive algorithms
,
implementation
,
math
800
x15150
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x10411
1749A
Cowardly Rooks
greedy
,
implementation
800
x19950
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x7703
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x11190
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x68
1746C
Permutation Operations
constructive algorithms
,
greedy
,
implementation
,
math
1300
x9933
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x17510
1744B
Even-Odd Increments
implementation
,
math
800
x19611
1744A
Number Replacement
greedy
,
implementation
800
x22514
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x22543
1742C
Stripes
implementation
900
x23158
1742B
Increasing
greedy
,
implementation
,
sortings
800
x32076
1742A
Sum
implementation
800
x38762
1741A
Compare T-Shirt Sizes
implementation
,
implementation
,
strings
800
x24941
1739A
Immobile Knight
implementation
800
x20240
1738A
Glory Addicts
greedy
,
implementation
,
sortings
800
x12549
1737D
Ela and the Wiring Wizard
brute force
,
dp
,
graphs
,
greedy
,
implementation
,
shortest paths
2200
x1597
1737C
Ela and Crickets
constructive algorithms
,
games
,
implementation
,
math
1500
x4656
1737B
Ela's Fitness and the Luxury Number
binary search
,
implementation
,
math
1300
x7702
1737A
Ela Sorting Books
greedy
,
implementation
,
strings
900
x8860
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x1992
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x7884
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x6226
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x1965
1732B
Ugu
brute force
,
dp
,
greedy
,
implementation
900
x11287
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x11610
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x9153
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x22482
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x55
1722F
L-shapes
dfs and similar
,
implementation
1700
x5128
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x7454
1722C
Word Game
data structures
,
implementation
800
x23705
1722B
Colourblindness
implementation
800
x33035
1722A
Spell Check
implementation
800
x34189
1721B
Deadly Laser
implementation
1000
x18546
1721A
Image
greedy
,
implementation
800
x23606
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x623
1720C
Corners
greedy
,
implementation
1200
x13933
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x10840
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x74
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2301
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x406
1717B
Madoka and Underground Competitions
constructive algorithms
,
implementation
1100
x13061
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x3478
1715C
Monoblock
combinatorics
,
data structures
,
implementation
,
math
1700
x7151
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x2452
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x24533
1714A
Everyone Loves to Sleep
implementation
,
math
900
x23637
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x20158
1712A
Wonderful Permutation
greedy
,
implementation
800
x22194
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x1991
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