add one solutoin for 836

Author: fishercoder1534

README.md

@@ -122,6 +122,7 @@ _If you like this project, please leave me a star._ ★
 |849|[Maximize Distance to Closest Person](https://leetcode.com/problems/maximize-distance-to-closest-person/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_849.java) | O(n^2) | O(1) | |Easy|
 |844|[Backspace String Compare](https://leetcode.com/problems/backspace-string-compare/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_844.java) | O(n) | O(1) | |Easy|
 |840|[Magic Squares In Grid](https://leetcode.com/problems/magic-squares-in-grid/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_840.java) | O(1) | O(1) | |Easy|
+|836|[Rectangle Overlap](https://leetcode.com/problems/rectangle-overlap/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_836.java) | O(1) | O(1) | |Easy|
 |832|[Flipping an Image](https://leetcode.com/problems/flipping-an-image/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_832.java) | O(n) | O(1) | |Easy|
 |830|[Positions of Large Groups](https://leetcode.com/problems/positions-of-large-groups/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_830.java) | O(n) | O(n) | |Easy|
 |824|[Goat Latin](https://leetcode.com/problems/goat-latin/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_824.java) | O(n) | O(1) | |Easy| 

src/main/java/com/fishercoder/solutions/_836.java

@@ -23,8 +23,9 @@
  * */
 public class _836 {
     public static class Solution1 {
+        /**credit: https://leetcode.com/problems/rectangle-overlap/discuss/132340/C%2B%2BJavaPython-1-line-Solution-1D-to-2D*/
         public boolean isRectangleOverlap(int[] rec1, int[] rec2) {
-            return false;
+            return rec1[0] < rec2[2] && rec2[0] < rec1[2] && rec1[1] < rec2[3] && rec2[1] < rec1[3];
         }
     }
 }

src/test/java/com/fishercoder/_836Test.java

@@ -0,0 +1,26 @@
+package com.fishercoder;
+
+import com.fishercoder.solutions._836;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class _836Test {
+    private static _836.Solution1 solution1;
+
+    @BeforeClass
+    public static void setup() {
+        solution1 = new _836.Solution1();
+    }
+
+    @Test
+    public void test1() {
+        assertEquals(true, solution1.isRectangleOverlap(new int[]{0, 0, 2, 2}, new int[]{1, 1, 3, 3}));
+    }
+
+    @Test
+    public void test2() {
+        assertEquals(false, solution1.isRectangleOverlap(new int[]{0, 0, 1, 1}, new int[]{1, 0, 2, 1}));
+    }
+}