2011 Canadian Computing Competition, Stage 2

Day 2, Problem 3: Biggest (Zero Carbon) Footprint

Having just recently won the lottery, you decide to build a summer resort nestled deep in a forest. However, being a very eco-friendly person, you decide not to cut down any of the trees that grow in the forest. Given a map of the forest and the positions of its trees, determine the area of the largest rectangular plot you can buy that does not contain any of the trees. (Note that your plot must have edges which are parallel to the x and y axes.)

Input Format

The first line contains n, m, and t (0 ≤ nm ≤ 10000, 0 ≤ t ≤ 10000), representing the dimensions of the given map of the forest and the number of trees indicated on the map respectively. The next t lines each contain two integers x and y (0 ≤ x ≤ n, 0 ≤ y ≤ m) describing the location of each tree (where (0,0) is the bottom leftmost point on the map and (n,m) is the top rightmost point on the map).

Note: for 20% of the marks for this question, you may assume that t ≤ 100, and for 45% of the marks for this question, t ≤ 400.

Output Format

Output the area of the largest rectangle that does not contain any of the given trees.

Sample Input

5 5 2
1 1
3 3

Sample Output

12

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Point Value: 25 (partial)
Time Limit: 5.00s
Memory Limit: 256M
Added: Jun 06, 2011

Languages Allowed:
C++03, PAS, C, HASK, ASM, RUBY, PYTH2, JAVA, PHP, SCM, CAML, PERL, C#, C++11, PYTH3

Comments (Search)

A point is not inside the rectangle if it is on the edge of the rectangle. The sample case implies that this is the case.

So a point outside of the rectangle is inside as well?

Why did you change your initial comment? Now I look stupid.