Create PivotIndex.java

Leetcode/PivotIndex.java

@@ -0,0 +1,29 @@
+package Leetcode;
+
+public class PivotIndex {
+
+
+ public int pivotIndex(int[] nums) {
+        // int sumRight=0;
+        int sumLeft=0;
+        int sum=0;
+
+        // get the total sums
+        for(int i=0;i<nums.length;i++){
+            sum+=nums[i];
+        }
+
+        //reduce index i from the sum which makes it right sum and add it in the left sum
+        for(int i=0;i<nums.length;i++){
+            sum-=nums[i];
+            if(sum==sumLeft){
+                return i;
+            }
+            sumLeft+=nums[i];
+        }
+        return -1;
+    }
+
+
+
+}