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.
双指针，思路与Trapping Rain Water类似。
数值小的指针往中间逼近。
复杂度O(n)。
class Solution { public: int maxArea(vector<int> &height) { if(height.empty() || height.size() == 1) return 0; int result = 0; int left = 0; int right = height.size()-1; int leftWall = height[left]; int rightWall = height[right]; while(left < right) { result = max(result, min(leftWall, rightWall) * (right-left)); if(leftWall <= rightWall) { left ++; leftWall = height[left]; } else { right --; rightWall = height[right]; } } return result; } };
【LeetCode】Container With Most Water
原文：http://www.cnblogs.com/ganganloveu/p/4176606.html