diff --git a/src/problem/mod.rs b/src/problem/mod.rs
index af7ef2a..17369ae 100644
--- a/src/problem/mod.rs
+++ b/src/problem/mod.rs
@@ -324,3 +324,5 @@ mod p3240_minimum_number_of_flips_to_make_binary_grid_palindromic_ii;
 mod p825_friends_of_appropriate_ages;
 
 mod p661_image_smoother;
+
+mod p3243_shortest_distance_after_road_addition_queries_i;
diff --git a/src/problem/p3243_shortest_distance_after_road_addition_queries_i.rs b/src/problem/p3243_shortest_distance_after_road_addition_queries_i.rs
new file mode 100644
index 0000000..a622429
--- /dev/null
+++ b/src/problem/p3243_shortest_distance_after_road_addition_queries_i.rs
@@ -0,0 +1,67 @@
+/**
+ * [3243] Shortest Distance After Road Addition Queries I
+ */
+pub struct Solution {}
+
+// submission codes start here
+
+impl Solution {
+    pub fn shortest_distance_after_queries(n: i32, queries: Vec<Vec<i32>>) -> Vec<i32> {
+        let n = n as usize;
+        let mut matrix = vec![vec![]; n];
+        for i in 0..n - 1 {
+            matrix[i].push(i + 1);
+        }
+
+        let mut result = vec![];
+
+        for query in queries {
+            let (start, end) = (query[0] as usize, query[1] as usize);
+            matrix[start].push(end);
+
+            result.push(Self::bfs(n, &matrix));
+        }
+
+        result
+    }
+
+    fn bfs(n: usize, matrix: &Vec<Vec<usize>>) -> i32 {
+        use std::collections::VecDeque;
+        let mut distances = vec![-1; n];
+        let mut queue = VecDeque::new();
+        queue.push_back(0);
+
+        distances[0] = 0;
+
+        while let Some(head) = queue.pop_front() {
+            for &next in matrix[head].iter() {
+                if distances[next] >= 0 {
+                    continue;
+                }
+                queue.push_back(next);
+                distances[next] = distances[head] + 1;
+            }
+        }
+
+        distances[n - 1]
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_3243() {
+        assert_eq!(
+            vec![3, 2, 1],
+            Solution::shortest_distance_after_queries(5, vec![vec![2, 4], vec![0, 2], vec![0, 4]])
+        );
+        assert_eq!(
+            vec![1, 1],
+            Solution::shortest_distance_after_queries(4, vec![vec![0, 3], vec![0, 2]])
+        );
+    }
+}