189. 轮转数组

src/arr.rs

@@ -1,12 +1,12 @@
-pub fn make_arr(s: &str) -> Vec<Option<i32>> {
+pub fn make_arr(s: &str) -> Vec<i32> {
     s.trim_matches(&['[', ']'][..])
         .split(',')
         .map(|x| {
             let x = x.trim();
             if x == "null" {
-                None
+                -1
             } else {
-                Some(x.parse::<i32>().unwrap())
+                x.parse::<i32>().unwrap()
             }
         })
         .collect()