17 August 2018

Codeforces Round #143 D: Magic Box

Hi All,

Problem Statement:
Given a parallelepiped with coordinates of diagonal as (0,0,0) and (x,y,z), another point (x,y,z) having an observer you need to find sum of all the values observer can see. Every face has a value written over it. 

For more details: http://codeforces.com/problemset/problem/231/D

My Approach: Observer can look at any face's value only and only if he is on opposite side of parallelepiped with respect to that face. For example: Observer can see value written on Z=0 plane only and only if coordinates of his value are (Z<0), otherwise he will always be on other side of the face and as parallelepiped is not transparent, he can't look at the number. 

Implementation:
Link: http://codeforces.com/contest/231/submission/41682545

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