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1622C
Set or Decrease
binary searchbrute forcegreedysortings
1829G
Hits Different
data structuresdpimplementationmath
372A
Counting Kangaroos is Fun
binary searchgreedysortingstwo pointers
1555D
Say No to Palindromes
brute forceconstructive algorithmsdpstrings
735D
Taxes
mathnumber theory
1610C
Keshi Is Throwing a Party
binary searchgreedy
75C
Modified GCD
binary searchnumber theory
1542C
Strange Function
mathnumber theory
1907E
Good Triples
brute forcecombinatoricsnumber theory
1344A
Hilbert's Hotel
mathnumber theorysortings
1537E1
Erase and Extend (Easy Version)
binary searchbrute forcedpgreedyhashingimplementationstring suffix structuresstrings
1396A
Multiples of Length
constructive algorithmsgreedynumber theory
1886C
Decreasing String
implementationstrings
1519D
Maximum Sum of Products
brute forcedpimplementationmathtwo pointers
1730B
Meeting on the Line
binary searchgeometrygreedyimplementationmathternary search
1373D
Maximum Sum on Even Positions
divide and conquerdpgreedyimplementation
1334C
Circle of Monsters
brute forceconstructive algorithmsgreedymath
1475E
Advertising Agency
combinatoricsmathsortings
343B
Alternating Current
data structuresgreedyimplementation
1741E
Sending a Sequence Over the Network
dp
1702E
Split Into Two Sets
dfs and similardsugraphs
1843E
Tracking Segments
binary searchbrute forcedata structurestwo pointers
1514C
Product 1 Modulo N
greedynumber theory
1856C
To Become Max
binary searchbrute forcedata structuresdp
1234D
Distinct Characters Queries
data structures
1833E
Round Dance
dfs and similardsugraphsshortest paths
1633D
Make Them Equal
dpgreedy
1305C
Kuroni and Impossible Calculation
brute forcecombinatoricsmathnumber theory
1528A
Parsa's Humongous Tree
dfs and similardivide and conquerdpgreedytrees
1497C2
k-LCM (hard version)
constructive algorithmsmath
706C
Hard problem
dpstrings
1165D
Almost All Divisors
mathnumber theory
1353D
Constructing the Array
constructive algorithmsdata structuressortings
1920C
Partitioning the Array
brute forcemathnumber theory
1389B
Array Walk
brute forcedpgreedy
235A
LCM Challenge
number theory
1363C
Game On Leaves
gamestrees
1349A
Orac and LCM
data structuresmathnumber theory
510C
Fox And Names
dfs and similargraphssortings
1352G
Special Permutation
constructive algorithms
1336A
Linova and Kingdom
dfs and similardpgreedysortingstrees
1458A
Row GCD
mathnumber theory
1B
Spreadsheet
implementationmath
431C
k-Tree
dpimplementationtrees
1526C2
Potions (Hard Version)
data structuresgreedy
371C
Hamburgers
binary searchbrute force
1398C
Good Subarrays
data structuresdpmath