diff --git a/problems/0494.目标和.md b/problems/0494.目标和.md
index 5d89f7dc..d9a30529 100644
--- a/problems/0494.目标和.md
+++ b/problems/0494.目标和.md
@@ -249,6 +249,7 @@ class Solution {
         for (int i = 0; i < nums.length; i++) sum += nums[i];
         if ((target + sum) % 2 != 0) return 0;
         int size = (target + sum) / 2;
+        if(size < 0) size = -size;
         int[] dp = new int[size + 1];
         dp[0] = 1;
         for (int i = 0; i < nums.length; i++) {