add erfen in go

animation-simulation/二分查找及其变种/找出第一个大于或小于目标的索引.md

@@ -76,25 +76,49 @@ public static int lowBoundnum(int[] nums,int target,int left, int right) {
 ```java
 public static int upperBoundnum(int[] nums,int target,int left, int right) {
 
-        while (left <= right) {
+    while (left <= right) {
 
-            int mid = left + ((right - left) >> 1);
-             //小于目标值
-            if (nums[mid] < target) {
-                //看看是不是当前区间的最后一位，如果当前小于，后面一位大于，返回当前值即可
-                if (mid == right || nums[mid+1] >= target) {
-                    return mid;
-                }
-                else{
-                    left = mid + 1;
-                }
-
-            } else if (nums[mid] >= target){
-                right = mid - 1;
+        int mid = left + ((right - left) >> 1);
+            //小于目标值
+        if (nums[mid] < target) {
+            //看看是不是当前区间的最后一位，如果当前小于，后面一位大于，返回当前值即可
+            if (mid == right || nums[mid+1] >= target) {
+                return mid;
             }
+            else{
+                left = mid + 1;
+            }
+
+        } else if (nums[mid] >= target){
+            right = mid - 1;
         }
-        //没有查询到的情况
-        return -1;
     }
+    //没有查询到的情况
+    return -1;
+}
 ```
 
+Go Code:
+```go
+func upperBoundnum(nums []int, target, left, right int) int {
+
+	for left <= right {
+
+		mid := left + ((right - left) >> 1)
+		//小于目标值
+		if nums[mid] < target {
+			//看看是不是当前区间的最后一位，如果当前小于，后面一位大于，返回当前值即可
+			if mid == right || nums[mid+1] >= target {
+				return mid
+			} else {
+				left = mid + 1
+			}
+
+		} else if nums[mid] >= target {
+			right = mid - 1
+		}
+	}
+	//没有查询到的情况
+	return -1
+}
+```