Ghost Busters
Time Limit: 5 Seconds Memory Limit: 32768 KB
Special Judge
The famous Ghost Busters team has decided to upgrade their Ectomobile (aka Ecto-1) with a powerful proton gun and an advanced targeting system. Egon has designed and built all the hardware which consists of ectoplasmic scanner and a proton gun that has two degrees of freedom and can automatically rotate and fire in a 90 degrees trihedral angle. You have been hired to write a prototype for the targeting software.
Ghosts are detected by ectoplasmic scanner and are represented as floating spheres. The coordinates of their centers and radii are delivered from the ectoplasmic scanner to the targeting software. The coordinate system is aligned in such a way, that the proton gun fires from the point (0, 0, 0) anywhere into X >= 0, Y >= 0, Z >= 0 trihedral angle. The gun fires a proton ray in a straight line and is so powerful, that even a touch of its ray is enough to kill a ghost. The ray of the proton gun is able to kill a virtually unlimited number of ghosts on its way.
For the first prototype for the targeting software, you are asked to write a program that determines the maximal number of ghosts that can be killed with a single shot of the proton gun.
Input
On the first line of the input file there is a single integer number N (0 <= N <= 100) - the number of ghosts detected by the ectoplasmic scanner of Ecto-1. The following N lines describe detected ghosts - one ghost per line. The description of ith ghost (ghosts are numbered from 1 to N) consists of 4 integer numbers Xi, Yi, Zi, and Ri, separated by spaces. Xi, Yi, Zi (1 <= Xi, Yi, Zi <= 10000) are the coordinates of the ghost's center, and Ri (1 <= Ri <= min(Xi, Yi, Zi)) is the ghost's radius. Because ghosts are ectoplasmic, they can be arbitrarily placed in respect to each others. They can intersect, fit inside each other, coincide with each other, etc.
Process to the end of file.
Output
On the first line of the output file write a single integer number - the maximal number of ghosts that can be killed with a single shot of the proton gun. On the second line of the output file write the identifying numbers of the ghosts to be killed in an arbitrary order separated by spaces. If there are multiple ways to kill this number of ghosts then write any one.
Sample Input
2 1200 1200 3900 300 160 160 820 60 13 1200 1200 3900 300 160 160 820 60 100 10 10 10 10 100 10 10 10 10 100 10 10 10 10 10 50 50 50 10 100 100 75 20 100 75 100 20 75 100 100 20 3000 4000 7000 2600 100 1000 1000 50 1000 100 1000 100
Sample Output
2 1 2 5 6 7 9 10 11Submit
Source: Northeastern Europe 2002