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Codeforces Round (Div. 2)
5 days
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Difficulty:
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two pointers
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
#
Name
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x3621
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x11382
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x13210
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1110
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x937
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3423
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x8693
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3067
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12407
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x21038
1968B
Prefiquence
greedy
,
two pointers
800
x25729
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x535
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x13960
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x346
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8652
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x271
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5493
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8715
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x283
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x449
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2578
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14573
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x16076
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x13026
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x19337
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6214
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20595
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4439
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x55
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3613
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x11390
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x13780
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x147
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2994
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x19180
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2124
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5396
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13949
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1496
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8319
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11986
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x839
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1620
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1372
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12116
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x5057
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9834
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x834
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x14565
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x33719
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11052
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x684
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2657
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2737
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4262
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x3070
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28627
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1556
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x7980
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19470
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7497
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11476
1843B
Long Long
greedy
,
math
,
two pointers
800
x28400
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x33481
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x479
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4225
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x25738
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33266
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x919
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6957
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x20446
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3734
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x18030
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13862
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x607
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3482
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x833
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1682
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2228
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x334
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1550
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1218
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4082
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12936
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x950
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5904
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18886
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13610
1791C
Prepend and Append
implementation
,
two pointers
800
x42170
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15940
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3786
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x149
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1281
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x8072
1776H
Beppa and SwerChat
two pointers
1300
x6146
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7593
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1294
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x669
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x13475
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1151
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