feat: Solve leetcode problem for sorting. Level easy

JavaDsaWithTest/src/main/java/org/practice/dsa/leet_code/easy/sorting/ThirdMax.java

@@ -0,0 +1,43 @@
+package org.practice.dsa.leet_code.easy.sorting;
+
+public class ThirdMax {
+    public static void main(String[] args) {
+        int[] arr = {2,1,3};
+        System.out.println(thirdMax(arr));;
+    }
+
+    public static int thirdMax(int[] nums) {
+
+        sort(nums);
+        int pointer =0;
+        for (int i = nums.length-1; i >=0 ; i--) {
+            if (i == nums.length-1 || nums[i] !=nums[i+1]) {
+                pointer++;
+            }
+
+            if (pointer == 3) {
+                return nums[i];
+            }
+        }
+        return nums[nums.length -1];
+    }
+
+    private static void sort(int[] nums) {
+        boolean isSwap;
+
+        for (int i = 0; i < nums.length-1; i++) {
+            isSwap = false;
+            for (int j = 1; j < nums.length -1- i; j++) {
+                if (nums[j] < nums[j-1]) {
+                    int temp = nums[j];
+                    nums[j] = nums[j-1];
+                    nums[j-1]  = temp;
+                    isSwap = true;
+                }
+            }
+            if (!isSwap) {
+                break;
+            }
+        }
+    }
+}