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Educational Codeforces Round 150 (Rated for Div. 2)
2 days
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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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Problems
#
Name
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
probabilities
x347
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
probabilities
x1164
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
x607
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
x121
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x241
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x165
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2267
1807E
Interview
binary search
,
implementation
,
interactive
1300
x8997
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x5714
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x3832
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1459
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x463
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x483
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x377
1773H
Hot and Cold
binary search
,
interactive
2600
x249
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x278
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x276
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x326
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x374
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x2717
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x82
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x283
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1166
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1013
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x5906
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x304
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x442
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5030
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x488
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x7682
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x3839
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3124
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x679
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x1922
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1231
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3223
1639K
Treasure Hunt
graphs
,
interactive
1639J
Treasure Hunt
graphs
,
interactive
1639I
Treasure Hunt
graphs
,
interactive
1639H
Treasure Hunt
graphs
,
interactive
1639G
Treasure Hunt
graphs
,
interactive
1639F
Treasure Hunt
graphs
,
interactive
1639E
Treasure Hunt
graphs
,
interactive
1639D
Treasure Hunt
graphs
,
interactive
1639C
Treasure Hunt
graphs
,
interactive
1639B
Treasure Hunt
graphs
,
interactive
1639A
Treasure Hunt
graphs
,
interactive
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x3907
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x261
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x2809
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x2833
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6278
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1531
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4166
1599H
Hidden Fortress
interactive
,
math
2100
x898
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x1984
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3209
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x4914
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x399
1578I
Interactive Rays
geometry
,
interactive
3300
x57
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x96
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x294
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x637
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x5520
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x243
1546B
AquaMoon and Stolen String
interactive
,
math
1200
x12236
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x387
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x1837
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7068
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2371
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x132
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1662
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5277
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x225
1521C
Nastia and a Hidden Permutation
constructive algorithms
,
interactive
2000
x4060
1520F2
Guess the K-th Zero (Hard version)
binary search
,
constructive algorithms
,
data structures
,
interactive
2200
x2645
1520F1
Guess the K-th Zero (Easy version)
binary search
,
interactive
1600
x9510
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x445
1510I
Is It Rated?
greedy
,
interactive
,
math
,
probabilities
2700
x400
1505A
Is it rated - 2
*special problem
,
implementation
,
interactive
900
x12888
1503B
3-Coloring
constructive algorithms
,
games
,
interactive
1700
x6488
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x163
1498E
Two Houses
brute force
,
graphs
,
greedy
,
interactive
,
sortings
2200
x1676
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x335
1491F
Magnets
binary search
,
constructive algorithms
,
interactive
2700
x821
1486C2
Guessing the Greatest (hard version)
binary search
,
interactive
1900
x7298
1486C1
Guessing the Greatest (easy version)
binary search
,
interactive
1600
x10440
1482G
Vabank
binary search
,
interactive
3200
x205
1479A
Searching Local Minimum
binary search
,
interactive
,
ternary search
1700
x10136
1470C
Strange Shuffle
binary search
,
brute force
,
constructive algorithms
,
interactive
2500
x1210
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x143
1451E2
Bitwise Queries (Hard Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2300
x2596
1451E1
Bitwise Queries (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
2000
x3861
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x107
1442F
Differentiating Games
games
,
interactive
3400
x108
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x423
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x75
1425F
Flamingoes of Mystery
interactive
1400
x4448
1423M
Milutin's Plums
interactive
2800
x118
1407C
Chocolate Bunny
constructive algorithms
,
interactive
,
math
,
two pointers
1600
x10589
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