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LeetCode

sort the intervals by their start value

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class Solution {
    public int[][] merge(int[][] intervals) {
        Arrays.sort(intervals,(a,b)->a[0]-b[0]);
        LinkedList<int[]> dq=new LinkedList<>();
        for(int[] interval:intervals){
            if(dq.size()==0||interval[0]>dq.peekLast()[1]) dq.addLast(interval);
            else{
                dq.getLast()[1]=Math.max(dq.peekLast()[1],interval[1]);
            }
        }
        int[][] res=new int[dq.size()][2];
        int i=0;
        for(int[] interval:dq) res[i++]=interval;
        return res;
    }
}

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