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Codeforces Round 950 (Div. 3)
42:28:40
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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
1977E
Tensor
constructive algorithms
,
graphs
,
interactive
2600
x356
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
2400
x1531
1970D3
Arithmancy (Hard)
interactive
3100
x72
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x138
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x439
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x20
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6690
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1220
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6146
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x128
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x134
1919H
Tree Diameter
interactive
,
trees
2000
x133
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1596
1906C
Cursed Game
interactive
3000
x163
1903E
Geo Game
greedy
,
interactive
,
math
2000
x1822
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x312
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x337
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1192
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x3011
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x3551
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x10675
1858E2
Rollbacks (Hard Version)
data structures
,
interactive
,
trees
2600
x1014
1856D
More Wrong
divide and conquer
,
interactive
2100
x3123
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x527
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x319
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x2911
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x906
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2248
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1167
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x303
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x340
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x249
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2880
1812H
Expected Twist
*special problem
,
interactive
x136
1807E
Interview
binary search
,
implementation
,
interactive
1300
x12010
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7289
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4691
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1707
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x642
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x763
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x458
1773H
Hot and Cold
binary search
,
interactive
2600
x343
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x371
1764G3
Doremy's Perfect DS Class (Hard Version)
binary search
,
interactive
3300
x437
1764G2
Doremy's Perfect DS Class (Medium Version)
binary search
,
interactive
3000
x502
1764G1
Doremy's Perfect DS Class (Easy Version)
binary search
,
interactive
2900
x554
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3315
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x100
1746E2
Joking (Hard Version)
dp
,
interactive
3200
x377
1746E1
Joking (Easy Version)
binary search
,
constructive algorithms
,
interactive
,
ternary search
2500
x1376
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1159
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x6769
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x372
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x504
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5494
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x577
1698D
Fixed Point Guessing
binary search
,
constructive algorithms
,
interactive
1600
x8763
1697D
Guess The String
binary search
,
constructive algorithms
,
interactive
1900
x4298
1687B
Railway System
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
1700
x3501
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x776
1672E
notepad.exe
binary search
,
constructive algorithms
,
greedy
,
interactive
2200
x2099
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1387
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3730
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
x4245
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x311
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3094
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3195
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6752
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1716
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4556
1599H
Hidden Fortress
interactive
,
math
2100
x1016
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2168
1584D
Guess the Permutation
binary search
,
combinatorics
,
interactive
,
math
2000
x3573
1583D
Omkar and the Meaning of Life
constructive algorithms
,
greedy
,
interactive
1800
x5265
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x437
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x125
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x374
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x694
1556D
Take a Guess
bitmasks
,
constructive algorithms
,
interactive
,
math
1800
x6585
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x317
1546B
AquaMoon and Stolen String
interactive
,
math
1200
x12884
1545D
AquaMoon and Wrong Coordinate
constructive algorithms
,
interactive
,
math
3000
x467
1543D2
RPD and Rap Sheet (Hard Version)
brute force
,
constructive algorithms
,
interactive
,
math
2200
x1952
1543D1
RPD and Rap Sheet (Easy Version)
bitmasks
,
constructive algorithms
,
interactive
,
math
1700
x7467
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2650
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x144
1534E
Lost Array
graphs
,
greedy
,
interactive
,
shortest paths
2300
x1859
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5809
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