feat: add solutions to lc problem: No.0090 (#2115)

No.0090.Subsets II

Author: yanglbme

solution/0000-0099/0038.Count and Say/Solution.rs

@@ -1,22 +1,21 @@
-use std::iter::once;
-
-impl Solution {
-    pub fn count_and_say(n: i32) -> String {
-        (1..n)
-            .fold(vec![1], |curr, _| {
-                let mut next = vec![];
-                let mut slow = 0;
-                for fast in 0..=curr.len() {
-                    if fast == curr.len() || curr[slow] != curr[fast] {
-                        next.extend(once((fast - slow) as u8).chain(once(curr[slow])));
-                        slow = fast;
-                    }
-                }
-                next
-            })
-            .into_iter()
-            .map(|digit| (digit + b'0') as char)
-            .collect()
-    }
-}
-
+use std::iter::once;
+
+impl Solution {
+    pub fn count_and_say(n: i32) -> String {
+        (1..n)
+            .fold(vec![1], |curr, _| {
+                let mut next = vec![];
+                let mut slow = 0;
+                for fast in 0..=curr.len() {
+                    if fast == curr.len() || curr[slow] != curr[fast] {
+                        next.extend(once((fast - slow) as u8).chain(once(curr[slow])));
+                        slow = fast;
+                    }
+                }
+                next
+            })
+            .into_iter()
+            .map(|digit| (digit + b'0') as char)
+            .collect()
+    }
+}

solution/0000-0099/0065.Valid Number/README.md

@@ -277,13 +277,10 @@ impl Solution {
             }
         }
         if let Some(x) = s.chars().nth(i) {
-            if x == '.'
-                && (i + 1 == n
-                    || if let Some(m) = s.chars().nth(i + 1) {
-                        m == 'e' || m == 'E'
-                    } else {
-                        false
-                    })
+            if
+                x == '.' &&
+                (i + 1 == n ||
+                    (if let Some(m) = s.chars().nth(i + 1) { m == 'e' || m == 'E' } else { false }))
             {
                 return false;
             }