Merge pull request #12405 from fer2o3/kachow

feat(331): completed both challenges

2 files changed, 40 insertions, 0 deletions

diff --git a/challenge-331/benjamin-andre/rust/ch-1.rs b/challenge-331/benjamin-andre/rust/ch-1.rs
new file mode 100755
index 0000000000..4fed8bf7e0
--- /dev/null
+++ b/challenge-331/benjamin-andre/rust/ch-1.rs
@@ -0,0 +1,16 @@
+#!/bin/sh
+//usr/bin/env rustc --test $0 -o kachow && ./kachow --nocapture; rm -f kachow ; exit
+
+fn last_word(s: &str) -> usize {
+    s.trim()
+        .split_whitespace()
+        .last()
+        .map_or(0, |word| word.len())
+}
+
+#[test]
+fn example() {
+    assert_eq!(last_word("The Weekly Challenge"), 9);
+    assert_eq!(last_word("   Hello   World    "), 5);
+    assert_eq!(last_word("Let's begin the fun"), 3);
+}
diff --git a/challenge-331/benjamin-andre/rust/ch-2.rs b/challenge-331/benjamin-andre/rust/ch-2.rs
new file mode 100755
index 0000000000..33ed4dacdf
--- /dev/null
+++ b/challenge-331/benjamin-andre/rust/ch-2.rs
@@ -0,0 +1,24 @@
+#!/bin/sh
+//usr/bin/env rustc --test $0 -o kachow && ./kachow --nocapture; rm -f kachow ; exit
+
+fn buddy_strings(source: &str, target: &str) -> bool {
+    if source.len() != target.len() {
+        return false;
+    }
+    let s: Vec<char> = source.chars().collect();
+    let t: Vec<char> = target.chars().collect();
+    let diffs: Vec<usize> = (0..s.len()).filter(|&i| s[i] != t[i]).collect();
+    match diffs.len() {
+        0 => s.len() != s.iter().collect::<std::collections::HashSet<_>>().len(),
+        2 => s[diffs[0]] == t[diffs[1]] && s[diffs[1]] == t[diffs[0]],
+        _ => false,
+    }
+}
+
+#[test]
+fn example() {
+    assert_eq!(buddy_strings("fuck", "fcuk"), true);
+    assert_eq!(buddy_strings("love", "love"), false);
+    assert_eq!(buddy_strings("fodo", "food"), true);
+    assert_eq!(buddy_strings("feed", "feed"), true);
+}