A few problems

maximum-product-of-word-lengths/sol.rs

@@ -0,0 +1,32 @@
+use std::collections::HashMap;
+
+impl Solution {
+    #[inline]
+    pub fn letter_bitmap(word: &str) -> u32 {
+        word.bytes()
+            .fold(0u32, |bitmap, chr| bitmap | (1 << (chr-97)))
+    }
+
+    pub fn max_product(words: Vec<String>) -> i32 {
+        let vals: HashMap<u32, usize> = words
+            .iter()
+            .fold(HashMap::new(), |mut vals, word| {
+                let bitmap = Solution::letter_bitmap(word);
+                vals.insert(bitmap, word.len().max(*vals.get(&bitmap).unwrap_or(&0)));
+                vals
+            });
+        vals.iter()
+            .map(|(&bitmap1, &value1)| {
+                vals.iter()
+                    .filter_map(|(&bitmap2, &value2)| {
+                        if bitmap1 & bitmap2 == 0 {
+                            return Some(value1*value2);
+                        }
+                        None
+                    })
+                    .max()
+                    .unwrap_or(0)
+            })
+            .max().unwrap_or(0) as i32
+    }
+}