ransom-note

ransom-note/sol.rs

@@ -0,0 +1,20 @@
+use std::collections::HashMap;
+
+impl Solution {
+    pub fn can_construct(ransom_note: String, magazine: String) -> bool {
+        let mut magazine_map = magazine.bytes()
+            .fold([0; 26], |mut map, chr| {
+                map[chr as usize - 97] += 1;
+                map
+            });
+        ransom_note.bytes()
+            .all(|chr| {
+                let old = magazine_map[chr as usize - 97];
+                if old == 0 {
+                    return false;
+                }
+                magazine_map[chr as usize - 97] = old - 1;
+                true
+            })
+    }
+}