Merge pull request #1499 from s-zhang-cs/0349

修改0349 - 用 Java stream 代替 for loop

problems/0349.两个数组的交集.md

@@ -104,13 +104,8 @@ class Solution {
                 resSet.add(i);
             }
         }
-        int[] resArr = new int[resSet.size()];
-        int index = 0;
         //将结果几何转为数组
-        for (int i : resSet) {
-            resArr[index++] = i;
-        }
-        return resArr;
+        return resSet.stream().mapToInt(x -> x).toArray();
     }
 }
 ```