# LeetCode 11: Container With Most Water — Step-by-Step Visual Trace

**Medium** — Array | Two Pointers | Greedy

## The Problem

Given an array of heights representing vertical lines, find two lines that together with the x-axis form a container that can hold the most water.

## Approach

Use two pointers starting from both ends of the array. Calculate the area between the pointers and move the pointer with the smaller height inward, as moving the taller one would only decrease the area.

**Time:** O(n) · **Space:** O(1)

## Code

```python
class Solution:
    def maxArea(self, height: List[int]) -> int:
        left, right = 0, len(height) - 1
        max_area = 0

        while left < right:
            current_area = min(height[left], height[right]) * (right - left)
            max_area = max(max_area, current_area)

            if height[left] < height[right]:
                left += 1
            else:
                right -= 1

        return max_area
```

## Watch It Run

> **[Open interactive visualization](https://tracelit.dev/app?trace=0011_container-with-most-water)**

> **Try it yourself:** Open [TraceLit](https://tracelit.dev/app?trace=0011_container-with-most-water) and step through every line.

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*Built with [TraceLit](https://tracelit.dev) — the visual algorithm tracer for LeetCode practice.*