Update appNew update is available. Click here to update.
sidenav-btnClose
Topic list
Merge Intervals
MEDIUM
20 mins
142 upvotes
Sorting
Arrays
Topics (Covered in this problem)
Problem solved
Badge
Skill meter
Sorting
-
-
Arrays
-
-
Other topics
Problem solved
Badge
Skill meter
Strings
-
-
Matrices (2D Arrays)
-
-
Linked List
-
-
Binary Search
-
-
Stacks & Queues
-
-
Trees
-
-
Graph
-
-
Dynamic Programming
-
-
Greedy
-
-
Tries
-
-
SQL
-
-
Binary Search Trees
-
-
Heap
-
-
Bit Manipulation
-
-
Solve problems & track your progress
Checkout your overall progress in every topic here
Become
userLevel
Sensei
in DSA topics
Open the topic and solve more problems associated with it to improve your skills
Check out the skill meter for every topic
See how many problems you are left with to solve for cracking any stage. Score more than zero to get your progress counted.

Merge Intervals

Contributed by
Ashwani
Medium
yellow-spark
0/80
Avg time to solve 20 mins
Success Rate 80 %
Share
142 upvotes

Problem Statement

You are given N number of intervals, where each interval contains two integers denoting the start time and the end time for the interval.

The task is to merge all the overlapping intervals and return the list of merged intervals sorted by increasing order of their start time.

Two intervals [A,B] and [C,D] are said to be overlapping with each other if there is at least one integer that is covered by both of them.

For example:

For the given 5 intervals - [1, 4], [3, 5], [6, 8], [10, 12], [8, 9].

Since intervals [1, 4] and [3, 5] overlap with each other, we will merge them into a single interval as [1, 5].

Similarly, [6, 8] and [8, 9] overlap, merge them into [6,9].

Interval [10, 12] does not overlap with any interval.

Final List after merging overlapping intervals: [1, 5], [6, 9], [10, 12].
Detailed explanation ( Input/output format, Notes, Constraints, Images )
Sample Input 1:
2
1 3
3 5
Sample Output 1:
1 5  
Explanation for Sample Input 1
Since these two intervals overlap at point 3 so we merge them and the new interval becomes (1,5).
Sample Input 2:
5
1 3 6 8 10
4 5 8 9 12
Sample Output 2:
1 5
6 9
10 12
Reset Code
Full screen
Auto
copy-code
Console