Add problem 2011: Final Value of Variable After Performing Operations

src/lib.rs

@@ -1391,6 +1391,7 @@ pub mod problem_1996_the_number_of_weak_characters_in_the_game;
 pub mod problem_2000_reverse_prefix_of_word;
 pub mod problem_2006_count_number_of_pairs_with_absolute_difference_k;
 pub mod problem_2007_find_original_array_from_doubled_array;
+pub mod problem_2011_final_value_of_variable_after_performing_operations;
 
 #[cfg(test)]
 mod test_utilities;

src/problem_2011_final_value_of_variable_after_performing_operations/iterative.rs

@@ -0,0 +1,31 @@
+pub struct Solution;
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl Solution {
+    pub fn final_value_after_operations(operations: Vec<String>) -> i32 {
+        let mut result = 0;
+
+        for operation in operations {
+            result += if operation.as_bytes()[1] == b'+' { 1 } else { -1 };
+        }
+
+        result
+    }
+}
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl super::Solution for Solution {
+    fn final_value_after_operations(operations: Vec<String>) -> i32 {
+        Self::final_value_after_operations(operations)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_solution() {
+        super::super::tests::run::<super::Solution>();
+    }
+}

src/problem_2011_final_value_of_variable_after_performing_operations/mod.rs

@@ -0,0 +1,25 @@
+pub mod iterative;
+
+pub trait Solution {
+    fn final_value_after_operations(operations: Vec<String>) -> i32;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Solution;
+
+    pub fn run<S: Solution>() {
+        let test_cases = [
+            (&["--X", "X++", "X++"] as &[_], 1),
+            (&["++X", "++X", "X++"], 3),
+            (&["X++", "++X", "--X", "X--"], 0),
+        ];
+
+        for (operations, expected) in test_cases {
+            assert_eq!(
+                S::final_value_after_operations(operations.iter().copied().map(str::to_string).collect()),
+                expected,
+            );
+        }
+    }
+}