1 files changed, 31 insertions, 0 deletions
diff --git a/buddy-strings/src/main.rs b/buddy-strings/src/main.rs
new file mode 100644
index 0000000..dbc982c
--- /dev/null
+++ b/buddy-strings/src/main.rs
@@ -0,0 +1,31 @@
+fn main() {
+    println!("Hello, world!");
+    let tests = [
+        ("ab", "ba", true),
+        ("ab", "ab", false),
+        ("aa", "aa", true),
+        ("abcaa", "abcbb", false)
+    ];
+
+    for test in tests {
+        println!("{:?} {:?} is {} should be {}", test.0, test.1,
+                 Solution::buddy_strings(test.0.clone().to_string(), test.1.clone().to_string()),
+        test.2);
+    }
+}
+struct Solution;
+
+use std::collections::HashMap;
+
+impl Solution {
+    pub fn buddy_strings(s: String, goal: String) -> bool {
+        let mut occurences_s = HashMap::new();
+        let mut occurences_goal = HashMap::new();
+        let similarities = s.chars().zip(goal.chars()).filter(|(a,b)| {
+            *occurences_s.entry(a.clone()).or_insert(1) += 1; 
+            *occurences_goal.entry(b.clone()).or_insert(1) += 1; 
+            a != b})
+            .count();
+        s.len() == goal.len() && occurences_s == occurences_goal && (similarities == 2 || (similarities == 0 && occurences_s.values().any(|&x| x > 2)))
+    }
+}