Update 0435.无重叠区间.md

problems/0435.无重叠区间.md

@@ -399,18 +399,20 @@ object Solution {
 ```Rust
 impl Solution {
     pub fn erase_overlap_intervals(intervals: Vec<Vec<i32>>) -> i32 {
-        if intervals.len() == 0 { return 0; }
-        let mut intervals = intervals;
-        intervals.sort_by(|a, b| a[1].cmp(&b[1]));
+        if intervals.is_empty() {
+            return 0;
+        }
+        intervals.sort_by_key(|interval| interval[1]);
         let mut count = 1;
         let mut end = intervals[0][1];
-        for i in 1..intervals.len() {
-            if end <= intervals[i][0] {
-                end = intervals[i][1];
+        for v in intervals.iter().skip(1) {
+            if end <= v[0] {
+                end = v[1];
                 count += 1;
             }
         }
-        intervals.len() as i32 - count
+
+        (intervals.len() - count) as i32
     }
 }
 ```