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Codeforces Round #793 (Div. 2)
06:13:25
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Difficulty:
—
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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Custom test
Problems
#
Name
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x11406
1546B
AquaMoon and Stolen String
interactive
,
math
1200
x11083
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x8848
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x9643
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x8388
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x5153
1425F
Flamingoes of Mystery
interactive
1400
x3658
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x9572
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x9030
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x8108
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x9063
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x6562
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x5953
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x5617
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3048
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x2041
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x4924
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x4642
1010B
Rocket
binary search
,
interactive
1800
x4419
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x4307
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x3585
730B
Minimum and Maximum
constructive algorithms
,
interactive
1800
x2113
1486C2
Guessing the Greatest (hard version)
binary search
,
interactive
1900
x6390
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x4679
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4106
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x3901
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x2412
952B
A Map of the Cat
brute force
,
interactive
1900
x1736
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1574
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1451
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x3789
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x3492
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x3430
1103B
Game with modulo
binary search
,
constructive algorithms
,
interactive
2000
x2909
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x2848
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x2404
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x2399
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2302
1033D
Divisors
interactive
,
math
,
number theory
2000
x2021
896B
Ithea Plays With Chtholly
binary search
,
constructive algorithms
,
games
,
greedy
,
interactive
2000
x1780
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x1767
1019B
The hat
binary search
,
interactive
2000
x1688
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1509
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1091
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3380
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x2857
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x1904
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1688
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1303
1599H
Hidden Fortress
interactive
,
math
2100
x772
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2425
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2260
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2123
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x1690
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x1575
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1529
713B
Searching Rectangles
binary search
,
constructive algorithms
,
interactive
2200
x1338
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1289
809B
Glad to see you!
binary search
,
interactive
2200
x1286
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1253
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1153
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x895
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x367
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x2454
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2323
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x1772
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x1759
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1509
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x1064
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1306
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1132
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1014
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1004
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1000
1205C
Palindromic Paths
implementation
,
interactive
2400
x993
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x973
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x837
1061F
Lost Root
interactive
,
probabilities
2400
x536
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x518
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x502
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x256
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1104
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x761
1089C
Cactus Search
interactive
2500
x320
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x239
1375F
Integer Game
constructive algorithms
,
games
,
interactive
,
math
2600
x1597
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1226
1368F
Lamps on a Circle
games
,
implementation
,
interactive
,
math
2600
x728
1355F
Guess Divisors Count
constructive algorithms
,
interactive
,
number theory
2600
x611
1267I
Intriguing Selection
brute force
,
constructive algorithms
,
implementation
,
interactive
,
sortings
2600
x552
1354G
Find a Gift
binary search
,
interactive
,
probabilities
2600
x511
1081F
Tricky Interactor
constructive algorithms
,
implementation
,
interactive
2600
x373
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x295
1090F
How to Learn You Score
constructive algorithms
,
interactive
2600
x207
1370F2
The Hidden Pair (Hard Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2700
x1015
1364E
X-OR
bitmasks
,
constructive algorithms
,
divide and conquer
,
interactive
,
probabilities
2700
x838
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x707
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x396
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x362
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x334
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