initial commit

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "scratch"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "scratch"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/main.rs

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+#![allow(unused)]
+
+fn main() {
+    use std::collections::BTreeSet;
+
+    let a1 = vec!["foo", "live", "", "strong"];
+    let a2 = vec!["arp", "live", "strong"];
+    let a3 = vec!["live", "arp", "foo", "strong", "arp"];
+    let b1 = vec!["lively", "alive", "harp", "sharp", "armstrong"];
+
+    println!("\n");
+
+    print!("1: {:?}\t", in_array(&a1,&b1));
+    println!("{:?}\n", in_array(&a3,&b1));
+
+    print!("2: {:?}\t", in_array2(&a1,&b1));
+    println!("{:?}\n", in_array2(&a3,&b1));
+
+}
+
+fn in_array(arr_a: &[&str], arr_b: &[&str]) -> Vec<String> {
+    let mut arr: Vec<_> = arr_a.iter()
+            .filter(|e| !e.is_empty())
+            .copied().collect();
+    arr.sort();
+    arr.dedup();
+
+    let mut res = vec![];
+    for a in arr.iter() {
+        if arr_b.iter().any(|&b| b.contains(a)) {
+            res.push(a.to_string());
+        }
+    }
+    res
+}
+
+fn in_array2(arr_a: &[&str], arr_b: &[&str]) -> Vec<String> {
+    use std::collections::BTreeSet;
+    let arr: BTreeSet<_> = arr_a.iter().copied().collect();
+
+    arr.iter()
+        .filter(|&a| !a.is_empty())
+        .filter(|&a| arr_b.iter().any(|&b| b.contains(a)))
+        .map(|a| a.to_string())
+        .collect::<Vec<String>>()
+}