20240403 Finished

src/problem/mod.rs

@@ -91,4 +91,5 @@ mod p1997_first_day_where_you_have_been_in_all_the_rooms;
 mod p2908_minimum_sum_of_mountain_triplets_i;
 mod p2952_minimum_number_of_coins_to_be_added;
 mod p331_verify_preorder_serialization_of_a_binary_tree;
-mod p88_merge_sorted_array;
+mod p88_merge_sorted_array;
+mod p27_remove_element;

src/problem/p27_remove_element.rs

@@ -0,0 +1,52 @@
+/**
+ * [27] Remove Element
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn remove_element(nums: &mut Vec<i32>, val: i32) -> i32 {
+        if nums.len() == 0 {
+            return 0;
+        }
+
+        let mut last = nums.len() - 1;
+        let mut i = 0;
+
+        while i <= last {
+            while nums[i] == val {
+                if i == last {
+                    return last as i32;
+                }
+
+                nums[i] = nums[last];
+                last -= 1;
+            }
+
+            i += 1;
+        }
+
+        (last + 1) as i32
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_27() {
+        let mut array = vec![3,2,2,3];
+        assert_eq!(2, Solution::remove_element(&mut array, 3));
+        for i in 0..2 {
+            assert_eq!(2, array[i]);
+        }
+
+        let mut array = vec![3];
+        assert_eq!(0, Solution::remove_element(&mut array, 3));
+    }
+}