Zombit Monitoring2 | Python Fiddle

def answer(intervals):
	storage = set()
	maxX = len(intervals)

for interval in intervals:
		storage.update(range(interval[0],interval[1]))
	return len(storage)

def answer2(intervals):
    storage = []
    maxX = len(intervals)
    
    for interval in intervals:
    
        for value in range(interval[0],interval[1]):
            if value in storage:
            	continue
            else:
            	storage += [value]
    return len(storage)

def answer3(intervals):
    storage = set()
    class Flyweight(object):
        def get(self, theData, index):
            return theData[index]
        def set(self, theData, value):
            theData.update(value)
    wrapper = Flyweight()
    for interval in intervals:
    
        wrapper.set(storage,range(interval[0],interval[1]))
    return len(storage)  
def answer4(intervals):
    intervals = sorted(intervals)
    while len(intervals) > 1:
        print intervals
        interval1 = intervals[0]
        interval2 = intervals[1]
        if interval2[0] < interval1[0]:
        	intervals[0][0] = interval2[0]
        if interval2[1] > interval1[0]:
        	intervals[0][1] = interval2[1]
        del intervals[1]
    return intervals[0][1] - intervals[0][0]

def answer41(intervals):
    print intervals
    intervals = sorted(intervals)
    print intervals
    blocks = 1
    block_total = 0
    while len(intervals) > blocks:
        print intervals
        interval1 = intervals[blocks - 1]
        interval2 = intervals[blocks]
        print "testng %s and %s" %(interval1, interval2)
        if interval2[0] >= interval1[1]:
            block_total += intervals[blocks - 1][1] - intervals[blocks - 1][0]
            blocks += 1
            print "New Block Condition"
        else:
            #if interval2[0] < interval1[1]:
            #    intervals[blocks - 1][0] = interval2[0]
            if interval2[1] > interval1[1]:
                intervals[blocks - 1][1] = interval2[1]
            del intervals[blocks]
    block_total += intervals[blocks-1][1] - intervals[blocks-1][0]
    return block_total

def answer5(intervals):
    min,max = intervals[0]
    for interval in intervals:
        min = interval[0] if interval[0] < min else min
        max = interval[1] if interval[1] > max else max
    return max - min

# intervals = [[1, 3], [3, 6]] # 5
# intervals = [[10, 14], [4, 18], [19, 20], [19, 20], [13, 20]] # 16
# intervals = [[10, 14], [4, 18], [19, 20], [19, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [4, 18], [19, 20], [19, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [4, 18], [19, 20], [19, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [4, 18], [19, 20], [19, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [4, 18], [19, 20], [19, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [4, 18], [19, 20], [19, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [4, 18], [19, 20], [19, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [4, 18], [19, 20], [19, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [4, 18], [19, 20], [19, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [4, 18], [19, 20000], [19, 20], [13, 2000000], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20], [13, 20]]
intervals = [[1, 3], [14, 18], [2,3], [4,8], [5,6]] #10

print answer41(intervals)

Python Fiddle

Python Cloud IDE