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Codeforces Round (Div. 2)
5 days
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*combine tags by OR
greedy
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
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x14112
1994B
Fun Game
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x13714
1992D
Test of Love
dp
,
greedy
,
implementation
1200
x17594
1990B
Array Craft
constructive algorithms
,
greedy
1200
x13226
1989B
Substring and Subsequence
brute force
,
greedy
,
strings
1200
x17868
1987C
Basil's Garden
dp
,
greedy
1200
x15338
1987B
K-Sort
greedy
1000
x18035
1986C
Update Queries
data structures
,
greedy
,
sortings
1100
x21092
1986B
Matrix Stabilization
brute force
,
data structures
,
greedy
,
sortings
1000
x24497
1985C
Good Prefixes
greedy
1000
x28703
1984B
Large Addition
implementation
,
math
1100
x16801
1983B
Corner Twist
constructive algorithms
,
greedy
,
implementation
,
math
1200
x14590
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x15407
1982B
Collatz Conjecture
brute force
,
implementation
,
math
,
number theory
1200
x15320
1979B
XOR Sequences
bitmasks
,
greedy
1000
x21050
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x16554
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x20775
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x13324
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x16461
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x23921
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x3826
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x17562
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x14026
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x17031
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x26368
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x18191
1954B
Make It Ugly
implementation
,
math
1200
x17466
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x13762
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x22071
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x21962
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x19444
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x17712
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x28425
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x17926
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x19269
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x21836
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x27822
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x16472
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x26921
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x25092
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x19240
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x17093
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20945
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x20135
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x17326
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x20036
1914C
Quests
greedy
,
math
1100
x22523
1910A
Username
*special problem
,
implementation
1100
x1707
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x19414
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x24537
1905B
Begginer's Zelda
greedy
,
trees
1100
x15887
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x14185
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x12166
1902B
Getting Points
binary search
,
brute force
,
greedy
1100
x13947
1901B
Chip and Ribbon
greedy
,
math
1100
x14538
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x19735
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x19506
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12355
1881C
Perfect Square
brute force
,
implementation
1200
x16627
1876A
Helmets in Night Light
greedy
,
sortings
1000
x16403
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x16606
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13887
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x15127
1863C
MEX Repetition
implementation
,
math
1100
x13790
1863B
Split Sort
greedy
,
math
,
sortings
1100
x15024
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x20307
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x20923
1860B
Fancy Coins
binary search
,
brute force
,
greedy
,
math
1200
x16574
1859C
Another Permutation Problem
brute force
,
dp
,
greedy
,
math
1200
x16715
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x25850
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22613
1857C
Assembly via Minimums
greedy
,
sortings
1200
x24596
1857B
Maximum Rounding
greedy
,
implementation
,
math
1100
x22636
1851C
Tiles Comeback
greedy
1000
x22939
1850E
Cardboard for Pictures
binary search
,
geometry
,
implementation
,
math
1100
x22109
1849B
Monsters
greedy
,
math
,
sortings
1000
x24340
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x14247
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19658
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x18552
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x16489
1841B
Keep it Beautiful
implementation
1000
x21137
1839B
Lamps
greedy
,
sortings
1100
x14850
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21637
1836B
Astrophysicists
greedy
,
math
1100
x12476
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x13041
1834B
Maximum Strength
greedy
,
math
1000
x14935
1832C
Contrast Value
greedy
,
implementation
1200
x19613
1831B
Array merging
constructive algorithms
,
greedy
1000
x19732
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x19286
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x25416
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14888
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14453
1821B
Sort the Subarray
brute force
,
greedy
1100
x17892
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x15040
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x19401
1811B
Conveyor Belts
implementation
,
math
1000
x20066
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19456
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x18554
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x18412
1804B
Vaccination
greedy
,
implementation
1000
x14031
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