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+# Two Pointers
+
+Two pointers algorithm is a very useful technique in solving many problems, especially those that require scanning through arrays or lists.
+
+One practical example of using the two pointers algorithm is in finding pairs of numbers in an array that add up to a given target value.
+
+But, I prefer to provide example from the [leetcode](https://leetcode.com/problems/container-with-most-water/).
+
+
+
+```
+You are given an integer array height of length n. There are n vertical lines drawn such that the two endpoints of the ith line are (i, 0) and (i, height[i]).
+
+Find two lines that together with the x-axis form a container, such that the container contains the most water.
+
+Return the maximum amount of water a container can store.
+
+Notice that you may not slant the container.
+
+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.
+```
+
+## Complexity
+* **Time**: O(n)
+* **Space**: O(1)
+
+## References:
+
+* [DSA: Two-pointers algorithm. Review with the step-by-step guide](https://medium.com/@alexeyskrobot/dsa-two-pointers-algorithm-review-with-the-step-by-step-guide-e8368e11a144)
diff --git a/Uncategorized/Two Pointers/code.js b/Uncategorized/Two Pointers/code.js
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+const { Tracer, Array1DTracer, LogTracer, Layout, VerticalLayout } = require('algorithm-visualizer');
+
+const tracer = new Array1DTracer('Input array');
+const areaTracer = new Array1DTracer('Max area calculation');
+const logger = new LogTracer();
+
+Layout.setRoot(new VerticalLayout([tracer, areaTracer, logger]));
+
+function maxArea(height) {
+ tracer.set(height)
+
+ let left = 0;
+ let right = height.length - 1;
+ let maxArea = 0;
+
+ while (left < right) {
+ tracer.select(left);
+ tracer.select(right);
+ Tracer.delay();
+ logger.println(`Checking area between ${left} and ${right}`);
+
+ const h = Math.min(height[left], height[right]);
+ areaTracer.patch(0, h)
+ Tracer.delay();
+
+ const w = right - left;
+ areaTracer.patch(1, h)
+ Tracer.delay();
+
+ const area = h * w;
+ maxArea = Math.max(maxArea, area);
+
+ areaTracer.patch(2, maxArea)
+ Tracer.delay();
+
+ tracer.deselect(left, right)
+ Tracer.delay();
+
+ if (height[left] < height[right]) {
+ left++;
+ } else {
+ right--;
+ }
+ }
+
+ return maxArea;
+}
+
+const height1 = [1,8,6,2,5,4,8,3,7];
+console.log(maxArea(height1)); // Output: 49
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