469. Convex Polygon

469. Convex Polygon

刷题内容

Given a list of points that form a polygon when joined sequentially, find if this polygon is convex (Convex polygon definition).

Note:

There are at least 3 and at most 10,000 points.
Coordinates are in the range -10,000 to 10,000.
You may assume the polygon formed by given points is always a simple polygon (Simple polygon definition). In other words, we ensure that exactly two edges intersect at each vertex, and that edges otherwise don't intersect each other.

Example 1:

[[0,0],[0,1],[1,1],[1,0]]

Explanation:
Example 2:

[[0,0],[0,10],[10,10],[10,0],[5,5]]

Explanation:

- 时间复杂度: O(N)- 空间复杂度: O(1)

• The polygon is entirely contained in a closed half-plane defined by each of its edges.

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