Merging Overlapping Intervals

Question

Currently, I have intervals of:

temp_tuple = [[-25, -14], [-21, -16], [-20, -15], [-10, -7], [-8, -5], [-6, -3], [2, 4], [2, 3], [3, 6], [12, 15], [13, 18],          


        

Answer 1

#Given an array of intervals in sorted order and a new interval, return a sorted array after merging the interval

def mergeinter(intervals,newinter):
    n = len(intervals)
    start = newinter[0]# we mark the start and end of the new interval to be merged
    end = newinter[1]
    right,left = 0,0
    while right < n:# we track where this new interval belongs, i.e. how many interval are to the left of it and how many are to the right
        if start <= intervals[right][1]:# we find the first interval before which it fits
            if end < intervals[right][0]:# this checks if the interval is disjoint and lies between two given intervals
                break# in this case we have nothing to do and go to line 29 directly
            start = min(start,intervals[right][0])# if it intersects with the given intervals then we just update and merge the ends
            end = max(end,intervals[right][1])
        else:# counting how many to the left continuing from line 20
            left += 1 
        right += 1# moving right to find the fit continuation of line 20 and even if we merge in line 25, we go to the next interval before
    return intervals[:left] + [(start,end)] + intervals[right:] # we return starting from the next interval

#Given a collection of intervals, merge all overlapping intervals and return sorted list of disjoint intervals.

def merge(I):
    I.sort(key:lambda i:i[0])# sorting according to the start of all intervals
    res = []# we start from the last of the given arr of lists and check the ends of the intervals and merge from the end
    for i in I:
        if not res or res[-1][0] < i[1]:# if res is empty then we put an elem in it from I
            res.append(i)# if there is no overlap, just add it
        else:
            res[-1][1] = max(i[1], res[-1][1])# here we merge from the end so that res remains sorted
    return res