LeetCode-in-Dart

11. Container With Most Water

Medium

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 the line i is at (i, ai) and (i, 0). Find two lines, which, together with the x-axis forms a container, such that the container contains the most water.

Notice that you may not slant the container.

Example 1:

Input: height = [1,8,6,2,5,4,8,3,7]

Output: 49

Explanation: 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 2:

Input: height = [1,1]

Output: 1

Example 3:

Input: height = [4,3,2,1,4]

Output: 16

Example 4:

Input: height = [1,2,1]

Output: 2

Constraints:

• n == height.length
• 2 <= n <= 105
• 0 <= height[i] <= 104

Solution

class Solution {
  int maxArea(List<int> height) {
    int maxArea = -1;
    int left = 0;
    int right = height.length - 1;

    while (left < right) {
      if (height[left] < height[right]) {
        maxArea = max(maxArea, height[left] * (right - left));
        left++;
      } else {
        maxArea = max(maxArea, height[right] * (right - left));
        right--;
      }
    }

    return maxArea;
  }

  int max(int a, int b) {
    return (a > b) ? a : b;
  }
}

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