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.

思路：兩根線中，短線決定了總面積。因此從左右兩邊向中間靠攏

代碼：

class Solution {
public:
    int maxArea(vector<int> &height) {
        int max=0;
        int tempArea=0;
        int size=height.size();
        if(size==0) 
            return 0;
        int left=0;
        int right=size-1;
        while(left<right){
            tempArea=min(height[left],height[right])*(right-left);
            height[left]<=height[right]?++left:--right;
            if(tempArea>max) max=tempArea;
        }
        return max;
    }
};