Program - Given a collection of intervals which are already sorted by start number, merge all overlapping intervals.

Solution

org_intervals = [[1,3],[2,6],[5,10],[11,16],[15,18],[19,22]]
i = 0
while i < len(org_intervals)-1:
    if org_intervals[i+1][0] < org_intervals[i][1]:
        org_intervals[i][1]=org_intervals[i+1][1]
        del org_intervals[i+1]
        i = i - 1
    i = i + 1
print(org_intervals)