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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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Difficulty:
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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
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1809
39G
Inverse Function
implementation
2400
x124
331D1
Escaping on Beaveractor
dfs and similar
,
implementation
2400
x199
97A
Domino
brute force
,
implementation
2400
x250
332E
Binary Key
dp
,
greedy
,
implementation
2400
x297
32E
Hide-and-Seek
geometry
,
implementation
2400
x321
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x333
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x341
277C
Game
games
,
implementation
2400
x447
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x479
380B
Sereja and Tree
graphs
,
implementation
2400
x530
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x563
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x616
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x623
920D
Tanks
dp
,
greedy
,
implementation
2400
x684
1186F
Vus the Cossack and a Graph
dfs and similar
,
graphs
,
greedy
,
implementation
2400
x750
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x793
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x804
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x828
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x844
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x897
416D
Population Size
greedy
,
implementation
,
math
2400
x904
1091E
New Year and the Acquaintance Estimation
binary search
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
sortings
2400
x977
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x998
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1017
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1023
641D
Little Artem and Random Variable
dp
,
implementation
,
math
,
probabilities
2400
x1047
526E
Transmitting Levels
dp
,
implementation
2400
x1056
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1082
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1116
1205C
Palindromic Paths
implementation
,
interactive
2400
x1129
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1132
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1142
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1187
1343F
Restore the Permutation by Sorted Segments
brute force
,
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1232
1374F
Cyclic Shifts Sorting
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1263
908F
New Year and Rainbow Roads
graphs
,
greedy
,
implementation
2400
x1371
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1399
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1402
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1436
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1454
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1458
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1510
1329C
Drazil Likes Heap
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x1533
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1708
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1795
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1801
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1838
1369E
DeadLee
data structures
,
dfs and similar
,
greedy
,
implementation
,
sortings
2400
x2019
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2077
1358E
Are You Fired?
constructive algorithms
,
data structures
,
greedy
,
implementation
2400
x2079
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x2171
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x118
1970F3
Playing Quidditch (Hard)
implementation
2300
x240
40C
Berland Square
implementation
,
math
2300
x240
1970F2
Playing Quidditch (Medium)
implementation
2300
x247
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x247
241F
Race
brute force
,
implementation
2300
x260
77D
Domino Carpet
dp
,
implementation
2300
x310
1970F1
Playing Quidditch (Easy)
implementation
2300
x319
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x322
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x352
43E
Race
brute force
,
implementation
,
two pointers
2300
x375
358E
Dima and Kicks
brute force
,
dsu
,
graphs
,
implementation
2300
x386
248D
Sweets for Everyone!
binary search
,
greedy
,
implementation
2300
x479
254D
Rats
brute force
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
2300
x497
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x510
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x583
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x609
883C
Downloading B++
binary search
,
implementation
2300
x614
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x673
1250E
The Coronation
graphs
,
implementation
2300
x801
1070G
Monsters and Potions
brute force
,
dp
,
greedy
,
implementation
2300
x816
628E
Zbazi in Zeydabad
data structures
,
implementation
2300
x832
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x848
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x857
1468M
Similar Sets
data structures
,
graphs
,
implementation
2300
x908
1200F
Graph Traveler
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2300
x1013
878B
Teams Formation
data structures
,
implementation
2300
x1032
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1099
558D
Guess Your Way Out! II
data structures
,
implementation
,
sortings
2300
x1110
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1153
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1157
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1185
793C
Mice problem
geometry
,
implementation
,
math
,
sortings
2300
x1231
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1269
762D
Maximum path
dp
,
greedy
,
implementation
2300
x1293
1239C
Queue in the Train
data structures
,
greedy
,
implementation
2300
x1311
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1318
1385G
Columns Swaps
2-sat
,
dfs and similar
,
dsu
,
graphs
,
implementation
2300
x1327
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1352
1244F
Chips
constructive algorithms
,
implementation
2300
x1363
1004D
Sonya and Matrix
brute force
,
constructive algorithms
,
implementation
2300
x1391
723F
st-Spanning Tree
dsu
,
graphs
,
greedy
,
implementation
2300
x1440
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1448
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1628
1610E
AmShZ and G.O.A.T.
binary search
,
brute force
,
greedy
,
implementation
,
math
2300
x1630
1217E
Sum Queries?
data structures
,
greedy
,
implementation
,
math
2300
x1643
1236D
Alice and the Doll
brute force
,
data structures
,
greedy
,
implementation
2300
x1648
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1668
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