11-medium-Container_With_Most_Water.js

/**
11. 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 and n is at least 2.

The above vertical lines are represented by array [1,8,6,2,5,4,8,3,7]. In this case, the max area of water (blue section) the container can contain is 49.

Example:

Input: [1,8,6,2,5,4,8,3,7]
Output: 49
 */

/**
 * @param {number[]} height
 * @return {number}
 */
var maxArea = function (height) {
  var max = 0
  var l = 0
  var r = height.length - 1
  while (l < r) {
    max = Math.max(max, Math.min(height[l], height[r]) * (r - l))
    if (height[l] < height[r]) { l++ } else { r-- }
  }
  return max
}