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Codeforces Round 977 (Div. 2)
2 days
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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
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Custom test
Problems
#
Name
2020B
Brightness Begins
binary search
,
math
1200
x12347
2019B
All Pairs Segments
implementation
,
math
1200
x11366
2014C
Robin Hood in Town
binary search
,
greedy
,
math
1100
x18247
2009C
The Legend of Freya the Frog
implementation
,
math
1100
x23417
2008D
Sakurako's Hobby
dp
,
dsu
,
graphs
,
math
1100
x17969
2005B2
The Strict Teacher (Hard Version)
binary search
,
greedy
,
math
,
sortings
1200
x15544
2004C
Splitting Items
games
,
greedy
,
sortings
1100
x22281
2003C
Turtle and Good Pairs
constructive algorithms
,
greedy
,
sortings
,
strings
1200
x17225
2002C
Black Circles
brute force
,
geometry
,
greedy
,
math
1200
x14358
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x21802
1999E
Triple Operations
dp
,
implementation
,
math
1300
x17633
1999D
Slavic's Exam
greedy
,
implementation
,
strings
1100
x25711
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x21166
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x19959
1996C
Sort
dp
,
greedy
,
sortings
,
strings
1200
x21956
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x17334
1994B
Fun Game
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x16082
1993B
Parity and Sum
constructive algorithms
,
greedy
1100
x21994
1992D
Test of Love
dp
,
greedy
,
implementation
1200
x19828
1991C
Absolute Zero
constructive algorithms
,
greedy
,
math
1300
x13877
1991B
AND Reconstruction
bitmasks
,
constructive algorithms
,
greedy
1100
x15823
1990B
Array Craft
constructive algorithms
,
greedy
1200
x15934
1989B
Substring and Subsequence
brute force
,
greedy
,
strings
1200
x19585
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x15988
1987C
Basil's Garden
dp
,
greedy
1200
x16857
1986C
Update Queries
data structures
,
greedy
,
sortings
1100
x22370
1985E
Secret Box
brute force
,
combinatorics
,
math
1200
x19486
1984C1
Magnitude (Easy Version)
dp
,
greedy
,
math
1300
x16119
1984B
Large Addition
implementation
,
math
1100
x17845
1983B
Corner Twist
constructive algorithms
,
greedy
,
implementation
,
math
1200
x15708
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x16974
1982B
Collatz Conjecture
brute force
,
implementation
,
math
,
number theory
1200
x16525
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x13399
1980C
Sofia and the Lost Operations
constructive algorithms
,
greedy
1300
x18170
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x18361
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x14547
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x17351
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x21868
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x14220
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x13716
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x25411
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x14629
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x14743
1958A
1-3-5
*special problem
,
dp
1100
x1887
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x17690
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x20865
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x19094
1954B
Make It Ugly
implementation
,
math
1200
x18275
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x14351
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x22897
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x16571
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x22686
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x20176
1945D
Seraphim the Owl
dp
,
greedy
1300
x14227
1945C
Left and Right Houses
brute force
1200
x14726
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x16036
1943A
MEX Game 1
games
,
greedy
1300
x17643
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x10825
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x13743
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x18226
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x14852
1935B
Informatics in MAC
constructive algorithms
1200
x18334
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x18665
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x20031
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x22441
1932B
Chaya Calendar
number theory
1100
x20544
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x18618
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x17221
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x21195
1926D
Vlad and Division
bitmasks
,
greedy
1300
x15371
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x26337
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x19878
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x17578
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x18354
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x20501
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x21479
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x20669
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x22064
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x17732
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x21472
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x21528
1914C
Quests
greedy
,
math
1100
x23873
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x14924
1910A
Username
*special problem
,
implementation
1100
x1766
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x16843
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x20105
1905B
Begginer's Zelda
greedy
,
trees
1100
x16336
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x15295
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x12734
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x13681
1902B
Getting Points
binary search
,
brute force
,
greedy
1100
x14367
1901B
Chip and Ribbon
greedy
,
math
1100
x14948
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x11457
1899E
Queue Sort
greedy
,
implementation
,
sortings
1300
x15418
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x13482
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x21029
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x20564
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x17929
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x13115
1886B
Fear of the Dark
binary search
,
geometry
,
math
1200
x16129
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