fix

Author: 0xmountaintop

kamyu104/src/find_the_difference.rs

@@ -17,14 +17,16 @@ use std::collections::HashSet;
 //     }
 // }
 
+// https://github.com/kamyu104/LeetCode-Solutions/blob/master/Python/find-the-difference.py#L18
 pub struct Solution3 {}
 impl Solution3 {
     pub fn find_the_difference(s: String, t: String) -> char {
         let s_chars: HashSet<char> = s.chars().collect();
-        let t_chars: HashSet<char> = t.chars().collect();
-        // or https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.symmetric_difference
-        let diff: HashSet<&char> = t_chars.difference(&s_chars).collect(); 
-        *(diff.into_iter().collect::<Vec<&char>>()[0])
+        let mut t_chars: HashSet<char> = t.chars().collect();
+        s_chars.iter().for_each(|c| {
+            t_chars.remove(c);
+        });
+        t_chars.into_iter().collect::<Vec<char>>()[0]
     }
 }
 
@@ -40,11 +42,10 @@ pub struct Solution5 {}
 impl Solution5 {
     pub fn find_the_difference(s: String, t: String) -> char {
         let s_chars: HashSet<char> = s.chars().collect();
-        let mut t_chars: HashSet<char> = t.chars().collect();
-        s_chars.iter().for_each(|c| {
-            t_chars.remove(c);
-        });
-        t_chars.into_iter().collect::<Vec<char>>()[0]
+        let t_chars: HashSet<char> = t.chars().collect();
+        // or https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.symmetric_difference
+        let diff: HashSet<&char> = t_chars.difference(&s_chars).collect();
+        *(diff.into_iter().collect::<Vec<&char>>()[0])
     }
 }