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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
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
x3324
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x11057
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x12815
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1098
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x917
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3403
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x8637
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3055
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12369
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x20978
1968B
Prefiquence
greedy
,
two pointers
800
x25688
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x533
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x13929
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x346
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8637
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x269
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5475
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8697
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x282
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x448
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2573
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14558
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x16059
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x13002
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x19282
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6204
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20576
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4430
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x55
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3608
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x11348
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x13750
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
x2992
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x19129
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2123
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5387
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13926
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
x8313
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11958
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x838
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1618
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1371
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12094
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x5051
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9804
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x833
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x14540
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x33691
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11041
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x684
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2656
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2735
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4261
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x3067
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28612
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1554
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x7969
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19446
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7494
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11456
1843B
Long Long
greedy
,
math
,
two pointers
800
x28387
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x33470
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
x25695
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33238
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x918
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6947
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x20413
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3732
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x18002
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13827
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x607
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3480
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
x1681
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2225
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
x1217
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4074
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12913
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
x5898
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18849
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13601
1791C
Prepend and Append
implementation
,
two pointers
800
x42092
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15934
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3785
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
x1280
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x8062
1776H
Beppa and SwerChat
two pointers
1300
x6142
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7589
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
x668
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x13459
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1151
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