diff --git a/57.Insert Interval.cpp b/57.Insert Interval.cpp
new file mode 100644
index 0000000..f048f2a
--- /dev/null
+++ b/57.Insert Interval.cpp	
@@ -0,0 +1,28 @@
+class Solution {
+public:
+    vector<vector<int>> insert(vector<vector<int>>& intervals, vector<int>& newInterval) {
+        vector<vector<int>> res;
+        int i = 0;
+        
+        // Left part (no intersection with newInterval)
+        while (i < intervals.size() && intervals[i][1] < newInterval[0]) {
+            res.push_back(intervals[i]);
+            ++i;
+        }
+        
+        // newInterval part (with or without merge)
+        while (i < intervals.size() && intervals[i][0] <= newInterval[1]) {
+            newInterval[0] = min(newInterval[0], intervals[i][0]);
+            newInterval[1] = max(newInterval[1], intervals[i][1]);
+            ++i;
+        }
+        res.push_back(newInterval);
+        
+        // Right part (no intersection with newInterval)
+        while (i < intervals.size() && intervals[i][0] > newInterval[1]) {
+            res.push_back(intervals[i]);
+            ++i;
+        }
+        return res;
+    }
+};
\ No newline at end of file