Create Solution.java

Author: Jerring

solution/0724.Find Pivot Index/Solution.java

@@ -0,0 +1,16 @@
+class Solution {
+    public int pivotIndex(int[] nums) {
+        if (nums == null || nums.length < 3) {
+            return -1;
+        }
+        int sum = Arrays.stream(nums).sum();
+        int s = 0;
+        for (int i = 0; i < nums.length; ++i) {
+            if (s << 1 == sum - nums[i]) {
+                return i;
+            }
+            s += nums[i];
+        }
+        return -1;
+    }
+}