Container With Most Water

Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai).
n vertical lines are drawn such that the two endpoints of
line i is at (i, ai) and (i, 0). Find two lines,
which together with x-axis forms a container,
such that the container contains the most water.
Note
You may not slant the container.

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