Add insert-interval solution in TS

Author: Jeehay28

insert-interval/Jeehay28.ts

@@ -0,0 +1,31 @@
+// TC: O(n)
+// SC: O(n)
+function insert(intervals: number[][], newInterval: number[]): number[][] {
+  const result: number[][] = [];
+  const n = intervals.length;
+  let i = 0;
+
+  // Add all intervals that come before newInterval
+  while (i < n && intervals[i][1] < newInterval[0]) {
+    result.push(intervals[i]);
+    i++;
+  }
+
+  // Merge all overlapping intervals with newInterval
+  while (i < n && intervals[i][0] <= newInterval[1]) {
+    newInterval[0] = Math.min(intervals[i][0], newInterval[0]);
+    newInterval[1] = Math.max(intervals[i][1], newInterval[1]);
+    i++;
+  }
+
+  result.push(newInterval);
+
+  // Add remaining intervals after newInterval
+  while (i < n) {
+    result.push(intervals[i]);
+    i++;
+  }
+
+  return result;
+}
+