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Codeforces Round (Div. 2)
3 days
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Difficulty:
—
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
x3897
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x11674
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x13554
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1129
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x989
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3450
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x8755
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3085
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12461
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x21113
1968B
Prefiquence
greedy
,
two pointers
800
x25789
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x536
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x13995
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x346
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8667
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x272
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5505
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8739
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x284
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x451
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2583
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14603
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x16102
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x13051
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x19386
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6230
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20620
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4444
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x55
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3620
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x11445
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x13818
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
x2998
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x19228
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2126
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5404
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13965
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1498
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8333
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x12017
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
x1626
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1374
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12145
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x5066
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9857
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x835
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x14587
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x33760
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11060
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x685
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
x2739
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4264
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x3075
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28647
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1559
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x8079
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19518
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7510
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11507
1843B
Long Long
greedy
,
math
,
two pointers
800
x28417
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x33508
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x479
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4229
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x25786
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33278
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x920
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6966
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x20490
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3737
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x18067
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13889
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x607
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3485
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x834
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
x2233
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x335
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1554
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1221
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4092
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12959
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x951
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5913
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18930
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13625
1791C
Prepend and Append
implementation
,
two pointers
800
x42230
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15949
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3789
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
x8078
1776H
Beppa and SwerChat
two pointers
1300
x6156
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7598
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
x13509
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1153
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