Update 0300.最长上升子序列.md

Fix 300. 最长递增子序列
Java版本添加参数数组长度判断，现在可以AC

problems/0300.最长上升子序列.md

@@ -129,6 +129,7 @@ public:
 ```Java
 class Solution {
     public int lengthOfLIS(int[] nums) {
+        if (nums.length <= 1) return nums.length;
         int[] dp = new int[nums.length];
         int res = 1;
         Arrays.fill(dp, 1);
@@ -137,8 +138,8 @@ class Solution {
                 if (nums[i] > nums[j]) {
                     dp[i] = Math.max(dp[i], dp[j] + 1);
                 }
-                res = Math.max(res, dp[i]);
             }
+            res = Math.max(res, dp[i]);
         }
         return res;
     }