Point in Polygon

Problem #201

Tags: geometry

Who solved this?

points inside and outside of polygon

You perhaps remember the problem about Frodo and Black Riders - there we were calculating area by Monte-Carlo method. However, then it was sufficiently easy to know whether point gets into area (visible to rider) or not.

In general the task of checking whether point falls into the given polygon is more complicated. And so here is the dedicated exercise for it :)

Input data consist of several parts:

Answer should contain 1-based indices of the sample points which are inside the described polygon.

Note that all coordinates are integer for simplicity. Moreover, none of the sample points will have the same X-s or Y-s as any of polygon corners.

Example (for picture shown above):

input data:
10
10 5000
3000 9950
7000 9950
9990 5000
7000 50
5453 4819
6745 1403
7144 9311
3000 50
10 5000
12
8354 7354
8144 3649
2714 2749
9673 6106
179 7081
9202 3443
1859 8863
4940 4349
8856 9648
7692 5060
5101 2511
2052 2246

answer:
1 2 3 10 12
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