add 884

Author: cch123

S0884-uncommon-words-from-two-sentences/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "S0884-uncommon-words-from-two-sentences"
+version = "0.1.0"
+authors = ["Xargin <cao1988228@163.com>"]
+edition = "2018"
+
+[dependencies]

S0884-uncommon-words-from-two-sentences/src/main.rs

@@ -0,0 +1,18 @@
+fn main() {
+    let res = Solution::uncommon_from_sentences("abc def".to_string(), "def aaa".to_string());
+    println!("{:?}", res);
+}
+
+struct Solution;
+
+use std::collections::HashMap;
+impl Solution {
+    pub fn uncommon_from_sentences(a: String, b: String) -> Vec<String> {
+        let line = a + " " + b.as_str();
+        let word_arr = line.split(" ").collect::<Vec<&str>>();
+
+        let mut counter = HashMap::new();
+        word_arr.iter().for_each(|w| { counter.entry(w).and_modify(|e| *e += 1).or_insert(1); });
+        counter.iter().filter(|(_, &c)| c == 1).map(|(w, _)| w.to_string()) .collect::<Vec<String>>()
+    }
+}