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https://leetcode.com/problems/merge-intervals/submissions/ (Merge Intervals)

 code :- just copy and paste

-------------------------------------------

class Solution {

public:

    

    vector<vector<int>> merge(vector<vector<int>>& intervals) {

        //sort the intervals first

        if(intervals.size()<=1)

        {

            return intervals;

        }

        sort(intervals.begin(),intervals.end(),[](vector<int> &a,vector<int> &b){

            return a[0]<b[0];

        });

       

        //all overlapping intervals with non overlapping intervals would be here

        vector<vector<int>> mergeintervals;

        

        vector<int> startInterval=intervals.at(0);

        mergeintervals.push_back(startInterval);

        for(auto interval:intervals)

        {

            

             int currentStart=startInterval.at(0);

             int currentEnd=startInterval.at(1);

             int lastStart=interval.at(0);

             int lastEnd=interval.at(1);

            

            if(currentEnd>=lastStart )

            {

             

                startInterval.at(1)=max(currentEnd,lastEnd);

                 mergeintervals.back()=startInterval;

            }else

            {

                

                      startInterval=interval;

                mergeintervals.push_back(startInterval);

            }

        }

        

        

        return mergeintervals;

    }

};

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