All Tracks Math Problem

Hector & Safe house

Easy, Easy-Medium


DEA is currently struggling with a case of cooking Blue Crystal in Albuquerque. Hector Salamanca is a key witness of this case as he knows a lot of stuff regarding the Gang responsible for cooking & distribution of Blue Crystal.

"Hector Salamanca..? That Name rings a Bell!"

He agreed to tell everything he knows about this case to DEA. Gus Fring & Heisenberg are two people of the Gang which cook the Blue Crystal & they came to know about this. So, both of them want Hector to be dead before he tells anything to the DEA & Hank Schrader.

Heisenberg lives at a point (x1,y1) & Gus Fring at (x2,y2), both in Albuquerque.

Suddenly, DEA came to know that some of the Gang members want to kill Hector.

So, DEA is looking for a safe house along ax+by+c=0 (the border of Albuquerque), where they can ask Hector about the information he knew.

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DEA also knows about the coordinates of Heisenberg & Gus & they want the safe house to be at a location which maximizes the difference between distance of the safe house to Heisenberg's House & distance of the safe house to Gus Fring's House.

Help DEA in finding the maximum absolute difference between the distance between safe house & Heisenberg’s house and distance between safe house & Gus Fring’s house i.e.

  • Maximum value of absolute((distance between safe house & Heisenberg’s house) - (distance between safe house & Gus Fring’s house)).


First line contains an integer T denoting the number of test case(s).

Each test case consists of two lines.

First line of each test case contains three integers a, b & c, describing the equation of the border of Albuquerque along which DEA is looking for a safe house.

Second line of each test case contains four integers x1, y1, x2, y2.


For each test case output the integral part of answer in separate line.


  • 1 ≤ T ≤ 106
  • -103 ≤ a,b,c ,x1,y1,x2,y2 ≤ 103

NOTE : Answer to the given problem always exists.

-5 3 1
-1 4 -8 -5

Equation of the line L (on which there is Safe House) is
Co-ordinates of the houses of Heisenberg & Gus are-
(x1,y1) ≡ (-1,4)
(x2,y2) ≡ (-8,-5)

Max. difference between the (Safe House - Heisenberg House length) & (Safe House - Gus Fring's House length) is approx. 11.401.
So the integral part (floor value) is 11.

Time Limit: 3.0 sec(s) for each input file.
Memory Limit: 256 MB
Source Limit: 1024 KB
Marking Scheme: Marks are awarded when all the testcases pass.
Allowed Languages: C, C++, C++14, Clojure, C#, D, Erlang, F#, Go, Groovy, Haskell, Java, Java 8, JavaScript(Rhino), JavaScript(Node.js), Julia, Kotlin, Lisp, Lisp (SBCL), Lua, Objective-C, OCaml, Octave, Pascal, Perl, PHP, Python, Python 3, R(RScript), Racket, Ruby, Rust, Scala, Swift, Visual Basic


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This Problem was Asked in

NIT Raipur

Challenge Name

Breaking Code

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