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Before contest
Educational Codeforces Round 150 (Rated for Div. 2)
43:52:11
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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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Standings
Custom test
Problems
#
Name
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x12889
1546B
AquaMoon and Stolen String
interactive
,
math
1200
x12236
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x10259
1807E
Interview
binary search
,
implementation
,
interactive
1300
x9014
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x10822
1167B
Lost Numbers
brute force
,
divide and conquer
,
interactive
,
math
1400
x9416
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x6048
1425F
Flamingoes of Mystery
interactive
1400
x4448
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x10605
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x10442
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x9512
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x7686
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x5723
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x10136
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7069
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x6489
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6278
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3207
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3125
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x2179
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x5909
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x5522
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5281
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5030
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x4915
1010B
Rocket
binary search
,
interactive
1800
x4792
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4168
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x3836
730B
Minimum and Maximum
constructive algorithms
,
interactive
1800
x2272
1486C2
Guessing the Greatest (hard version)
binary search
,
interactive
1900
x7299
1207E
XOR Guessing
bitmasks
,
interactive
,
math
1900
x5139
1305D
Kuroni and the Celebration
constructive algorithms
,
dfs and similar
,
interactive
,
trees
1900
x4440
1270D
Strange Device
constructive algorithms
,
interactive
,
math
,
sortings
1900
x4237
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x3840
1063C
Dwarves, Hats and Extrasensory Abilities
binary search
,
constructive algorithms
,
geometry
,
interactive
1900
x2652
952B
A Map of the Cat
brute force
,
interactive
1900
x1831
744B
Hongcow's Game
bitmasks
,
divide and conquer
,
interactive
1900
x1633
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1490
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4060
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x3908
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x3861
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3224
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3209
1103B
Game with modulo
binary search
,
constructive algorithms
,
interactive
2000
x3066
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x2833
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2460
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2267
1033D
Divisors
interactive
,
math
,
number theory
2000
x2166
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x2012
896B
Ithea Plays With Chtholly
binary search
,
constructive algorithms
,
games
,
greedy
,
interactive
2000
x1906
1019B
The hat
binary search
,
interactive
2000
x1817
862D
Mahmoud and Ehab and the binary string
binary search
,
divide and conquer
,
interactive
2000
x1580
870D
Something with XOR Queries
brute force
,
interactive
,
probabilities
2000
x1138
1363D
Guess The Maximums
binary search
,
implementation
,
interactive
,
math
2100
x3627
1392E
Omkar and Duck
bitmasks
,
constructive algorithms
,
interactive
,
math
2100
x3041
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x2719
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2116
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1845
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1428
1599H
Hidden Fortress
interactive
,
math
2100
x898
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2646
1114E
Arithmetic Progression
binary search
,
interactive
,
number theory
,
probabilities
2200
x2497
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2371
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x1922
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x1837
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1676
809B
Glad to see you!
binary search
,
interactive
2200
x1389
713B
Searching Rectangles
binary search
,
constructive algorithms
,
interactive
2200
x1374
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1351
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1347
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1284
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1231
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x433
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x2810
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2596
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x1984
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x1889
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1662
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x1143
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1531
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1460
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1282
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1234
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1232
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1170
1286C1
Madhouse (Easy version)
brute force
,
constructive algorithms
,
interactive
,
math
2400
x1089
1205C
Palindromic Paths
implementation
,
interactive
2400
x1057
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1013
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x1013
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x679
1061F
Lost Root
interactive
,
probabilities
2400
x630
1080F
Katya and Segments Sets
data structures
,
interactive
,
sortings
2400
x584
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x273
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1210
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1166
1100D
Dasha and Chess
constructive algorithms
,
games
,
interactive
2500
x802
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x483
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x463
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x377
1089C
Cactus Search
interactive
2500
x354
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