diff --git a/problems/0494.目标和.md b/problems/0494.目标和.md
index 1835f498..0faef4a5 100644
--- a/problems/0494.目标和.md
+++ b/problems/0494.目标和.md
@@ -289,7 +289,7 @@ func findTargetSumWays(nums []int, target int) int {
 	for _, v := range nums {
 		sum += v
 	}
-	if target > sum {
+	if abs(target) > sum {
 		return 0
 	}
 	if (sum+target)%2 == 1 {
@@ -311,49 +311,12 @@ func findTargetSumWays(nums []int, target int) int {
 	}
 	return dp[bag]
 }
-```
-> 更新版，上一个跑不通了，因为会存在bag 小于0的情况
 
-```go
-func findTargetSumWays(nums []int, target int) int {
-    //先转化为数学问题
-    //a-b=target
-    //a+b=sum
-    //a=(target+sum)/2
-    //求出sum
-    var sum int
-    for _,value:=range nums{
-        sum+=value
-    }
-    //如果sum<target或者 sum+target不是偶数（因为a是int） 或者两者之和小于0了
-    if sum<target||(sum+target)%2==1||(sum+target)<0{
-        return 0
-    }
-    //开始dp初始化
-    dp:=make([][]int,len(nums)+1)
-    for i:=0;i<=len(nums);i++{
-        tmp:=make([]int,(target+sum)/2+1)//背包容量
-        dp[i]=tmp
-    }
-    dp[0][0]=1//当背包容量为0，且物品为0时，填满背包就1种方法
-    for i:=0;i<len(nums)+1;i++{
-        if i==0{
-            continue
-        }
-        for j:=0;j<(target+sum)/2+1;j++{
-            if nums[i-1]<=j{//如果背包装的下
-                dp[i][j]=dp[i-1][j]+dp[i-1][j-nums[i-1]]
-            }else{
-                dp[i][j]=dp[i-1][j]
-            }
-        }
-    }
-    return dp[len(nums)][(target+sum)/2]
+func abs(x int) int {
+	return int(math.Abs(float64(x)))
 }
 ```
 
-
-
 Javascript：
 ```javascript
 const findTargetSumWays = (nums, target) => {