Add problem 2315: Count Asterisks

src/lib.rs

@@ -1716,6 +1716,7 @@ pub mod problem_2303_calculate_amount_paid_in_taxes;
 pub mod problem_2305_fair_distribution_of_cookies;
 pub mod problem_2309_greatest_english_letter_in_upper_and_lower_case;
 pub mod problem_2310_sum_of_numbers_with_units_digit_k;
+pub mod problem_2315_count_asterisks;
 
 #[cfg(test)]
 mod test_utilities;

src/problem_2315_count_asterisks/iterative.rs

@@ -0,0 +1,42 @@
+pub struct Solution;
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl Solution {
+    pub fn count_asterisks(s: String) -> i32 {
+        let mut result = 0;
+        let mut iter = s.bytes();
+
+        loop {
+            loop {
+                if let Some(c) = iter.next() {
+                    if c == b'|' {
+                        break;
+                    }
+
+                    result += i32::from(c == b'*');
+                } else {
+                    return result;
+                }
+            }
+
+            iter.find(|&c| c == b'|');
+        }
+    }
+}
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl super::Solution for Solution {
+    fn count_asterisks(s: String) -> i32 {
+        Self::count_asterisks(s)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_solution() {
+        super::super::tests::run::<super::Solution>();
+    }
+}

src/problem_2315_count_asterisks/mod.rs

@@ -0,0 +1,22 @@
+pub mod iterative;
+
+pub trait Solution {
+    fn count_asterisks(s: String) -> i32;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Solution;
+
+    pub fn run<S: Solution>() {
+        let test_cases = [
+            ("l|*e*et|c**o|*de|", 2),
+            ("iamprogrammer", 0),
+            ("yo|uar|e**|b|e***au|tifu|l", 5),
+        ];
+
+        for (s, expected) in test_cases {
+            assert_eq!(S::count_asterisks(s.to_string()), expected);
+        }
+    }
+}