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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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Difficulty:
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interactive
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
#
Name
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1187
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1210
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1261
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1367
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1454
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1476
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1680
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1694
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1708
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x1263
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1857
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2067
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2167
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2840
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3087
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x489
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1384
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1391
713B
Searching Rectangles
binary search
,
constructive algorithms
,
interactive
2200
x1420
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1449
809B
Glad to see you!
binary search
,
interactive
2200
x1454
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1456
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1568
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1841
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x1946
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2095
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2240
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2642
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2776
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2904
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x2998
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x411
1599H
Hidden Fortress
interactive
,
math
2100
x1013
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1526
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1956
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2280
1856D
More Wrong
divide and conquer
,
interactive
2100
x3099
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3240
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3300
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3830
1919H
Tree Diameter
interactive
,
trees
2000
x130
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1195
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1652
1903E
Geo Game
greedy
,
interactive
,
math
2000
x1815
1019B
The hat
binary search
,
interactive
2000
x1891
896B
Ithea Plays With Chtholly
binary search
,
constructive algorithms
,
games
,
greedy
,
interactive
2000
x2053
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x2149
1033D
Divisors
interactive
,
math
,
number theory
2000
x2311
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2765
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2871
1103B
Game with modulo
binary search
,
constructive algorithms
,
interactive
2000
x3171
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3185
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3531
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3534
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3721
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x4206
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4237
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4286
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1550
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1707
952B
A Map of the Cat
brute force
,
interactive
1900
x2003
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x2792
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4290
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x4400
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4757
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x5639
1486C2
Guessing the Greatest (hard version)
binary search
,
interactive
1900
x8147
730B
Minimum and Maximum
constructive algorithms
,
interactive
1800
x2383
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x2891
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4539
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4666
1010B
Rocket
binary search
,
interactive
1800
x5075
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x5245
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5480
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5785
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6516
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x6751
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x2321
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3491
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3525
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6098
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6630
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6733
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x6848
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7450
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x11140
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7254
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x8727
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x10987
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x11434
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x11669
1425F
Flamingoes of Mystery
interactive
1400
x5277
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x6944
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x10736
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12409
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10612
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11717
1807E
Interview
binary search
,
implementation
,
interactive
1300
x11945
1546B
AquaMoon and Stolen String
interactive
,
math
1200
x12864
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x14031
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