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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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→ Filter Problems
Difficulty:
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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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Problems
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Status
Standings
Custom test
Problems
#
Name
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x19511
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2305
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x14626
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x11910
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x15291
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x24191
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x16075
1954B
Make It Ugly
implementation
,
math
1200
x15779
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x12264
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x20580
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x20637
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x18139
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16752
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26672
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x16844
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17991
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20692
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x26289
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15431
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25739
1926C
Vlad and a Sum of Sum of Digits
dp
,
implementation
1200
x23457
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18351
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x16285
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20093
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19382
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16773
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x18382
1914C
Quests
greedy
,
math
1100
x20940
1910A
Username
*special problem
,
implementation
1100
x1611
1907C
Removal of Unattractive Pairs
constructive algorithms
,
greedy
,
math
,
strings
1200
x18541
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x23452
1905B
Begginer's Zelda
greedy
,
trees
1100
x15340
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12987
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11480
1902B
Getting Points
binary search
,
brute force
,
greedy
1100
x13389
1901B
Chip and Ribbon
greedy
,
math
1100
x14074
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x18303
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x18242
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x11734
1881C
Perfect Square
brute force
,
implementation
1200
x15921
1876A
Helmets in Night Light
greedy
,
sortings
1000
x14983
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x15877
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13391
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x14798
1863C
MEX Repetition
implementation
,
math
1100
x13433
1863B
Split Sort
greedy
,
math
,
sortings
1100
x14619
1862C
Flower City Fence
binary search
,
data structures
,
implementation
,
sortings
1100
x19753
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x20196
1860B
Fancy Coins
binary search
,
brute force
,
greedy
,
math
1200
x16105
1859C
Another Permutation Problem
brute force
,
dp
,
greedy
,
math
1200
x16367
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x24475
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22024
1857C
Assembly via Minimums
greedy
,
sortings
1200
x23148
1857B
Maximum Rounding
greedy
,
implementation
,
math
1100
x22192
1851C
Tiles Comeback
greedy
1000
x22341
1850E
Cardboard for Pictures
binary search
,
geometry
,
implementation
,
math
1100
x21009
1849B
Monsters
greedy
,
math
,
sortings
1000
x22889
1848B
Vika and the Bridge
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1200
x13469
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19159
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x18011
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15752
1841B
Keep it Beautiful
implementation
1000
x20634
1839B
Lamps
greedy
,
sortings
1100
x14513
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21171
1836B
Astrophysicists
greedy
,
math
1100
x12290
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12683
1834B
Maximum Strength
greedy
,
math
1000
x14575
1832C
Contrast Value
greedy
,
implementation
1200
x18388
1831B
Array merging
constructive algorithms
,
greedy
1000
x18616
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18331
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24361
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14553
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14204
1821B
Sort the Subarray
brute force
,
greedy
1100
x17017
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x14729
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x18969
1811B
Conveyor Belts
implementation
,
math
1000
x19770
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19078
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17790
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17910
1804B
Vaccination
greedy
,
implementation
1000
x13809
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x12929
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21802
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21409
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22435
1800B
Count the Number of Pairs
greedy
,
strings
1000
x24016
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x10847
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15929
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x14626
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16065
1792B
Stand-up Comedian
greedy
,
math
1200
x20276
1791G1
Teleporters (Easy Version)
greedy
,
sortings
1100
x20637
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x25780
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x27128
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18289
1790C
Premutation
brute force
,
implementation
,
math
1000
x23021
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19303
1787B
Number Factorization
greedy
,
math
,
number theory
1100
x12747
1784A
Monsters (easy version)
brute force
,
greedy
1000
x14545
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x13252
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