diff --git a/.gitignore b/.gitignore
index 30eed9a..5ba13b5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 target
 .idea
-
+*.swp
diff --git a/src/list/PivotIndex.java b/src/list/PivotIndex.java
new file mode 100644
index 0000000..f8e0c2e
--- /dev/null
+++ b/src/list/PivotIndex.java
@@ -0,0 +1,39 @@
+package list;
+
+
+/**
+ * @file PivotIndex.java
+ * @apiNote https://leetcode-cn.com/leetbook/read/array-and-string/yf47s/
+ * @author zeekling
+ * @version 1.0
+ * @date 2020-08-16
+ */
+public class PivotIndex {
+
+
+	public int pivotIndex(int[] nums){
+		int sum = 0;
+		int len = nums.length;
+		for (int i=0; i< len;i++){
+			sum += nums[i];
+		}
+		int idx = -1;
+		int leftSum = 0;
+		for (int i=0;i<len;i++){
+
+			if ((leftSum * 2 + nums[i]) == sum){
+				return i;
+			}
+			leftSum += nums[i];
+		}
+		return -1;
+	}
+
+	public static void main(String[] args){
+		int[] arr = new int[]{1, 7, 3, 6, 5, 6};
+		PivotIndex pro = new PivotIndex();
+		int res = pro.pivotIndex(arr);
+		System.out.println(res);
+	}
+}
+