Solved 1021

Author: guangsheng.li01

src/a1021_remove_outermost_parentheses.rs

@@ -0,0 +1,59 @@
+/*
+ * [1021] remove-outermost-parentheses
+ */
+
+pub struct Solution {}
+
+// solution impl starts here
+
+impl Solution {
+    pub fn remove_outer_parentheses(s: String) -> String {
+        let (mut l, mut r) = (0, 0);
+        let mut res = String::new();
+        for i in s.chars() {
+            if i == '(' {
+                l += 1;
+            } else {
+                r += 1;
+            }
+
+            if l == r {
+                l = 0;
+                r = 0;
+            } else if l > 1 {
+                res.push(i);
+            }
+        }
+        res
+    }
+}
+
+// solution impl ends here
+
+// solution tests starts here
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_case0() {
+        assert_eq!(
+            Solution::remove_outer_parentheses("(()())(())".to_string()),
+            "()()()"
+        );
+    }
+    #[test]
+    fn test_case1() {
+        assert_eq!(
+            Solution::remove_outer_parentheses("(()())(())(()(()))".to_string()),
+            "()()()()(())"
+        );
+    }
+    #[test]
+    fn test_case2() {
+        assert_eq!(Solution::remove_outer_parentheses("()()".to_string()), "");
+    }
+}
+
+// solution tests ends here

src/lib.rs

@@ -16,6 +16,7 @@ mod a0643_maximum_average_subarray_i;
 mod a0929_unique_email_addresses;
 mod a0931_minimum_falling_path_sum;
 mod a0937_reorder_data_in_log_files;
+mod a1021_remove_outermost_parentheses;
 mod a1047_remove_all_adjacent_duplicates_in_string;
 mod a1200_minimum_absolute_difference;
 mod a1287_element_appearing_more_than_25_in_sorted_array;