diff --git a/src/problem/mod.rs b/src/problem/mod.rs
index 047020a..92bd317 100644
--- a/src/problem/mod.rs
+++ b/src/problem/mod.rs
@@ -131,4 +131,5 @@ mod p202_happy_number;
 mod p219_contains_duplicate_ii;
 mod p128_longest_consecutive_sequence;
 mod p228_summary_ranges;
-mod p56_merge_intervals;
\ No newline at end of file
+mod p56_merge_intervals;
+mod p57_insert_interval;
\ No newline at end of file
diff --git a/src/problem/p57_insert_interval.rs b/src/problem/p57_insert_interval.rs
new file mode 100644
index 0000000..859ad40
--- /dev/null
+++ b/src/problem/p57_insert_interval.rs
@@ -0,0 +1,49 @@
+/**
+ * [57] Insert Interval
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn insert(intervals: Vec<Vec<i32>>, new_interval: Vec<i32>) -> Vec<Vec<i32>> {
+        let (mut left, mut right) = (new_interval[0], new_interval[1]);
+
+        let mut result = vec![];
+        let mut placed = false;
+
+        for interval in intervals {
+            if interval[1] < left {
+                result.push(interval);
+            } else if interval[0] > right {
+                if !placed {
+                    result.push(vec![left, right]);
+                    placed = true;
+                }
+
+                result.push(interval);
+            } else {
+                left = left.min(interval[0]);
+                right = right.max(interval[1]);
+            }
+        }
+
+        if !placed {
+            result.push(vec![left, right]);
+        }
+
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_57() {
+    }
+}