java: add «11. Container With Most Water»

Signed-off-by: Matej Focko <me@mfocko.xyz>

java/container-with-most-water.java

@@ -0,0 +1,18 @@
+class Solution {
+  public int maxArea(int[] height) {
+    int foundMax = 0;
+
+    int l = 0, r = height.length - 1;
+    while (l < r) {
+      foundMax = Math.max(foundMax, (r - l) * Math.min(height[l], height[r]));
+
+      if (height[l] < height[r]) {
+        ++l;
+      } else {
+        --r;
+      }
+    }
+
+    return foundMax;
+  }
+}