class Solution:
def intervalIntersection(self, firstList: List[List[int]], secondList: List[List[int]]) -> List[List[int]]:
flp, slp = 0,0
overlaps = []
while flp < len(firstList) and slp < len(secondList):
m1 = firstList[flp]
m2 = secondList[slp]
overlap = [max(m1[0], m2[0]), min(m1[1], m2[1])]
if overlap[0] <= overlap[1]:
# found valid overlap
overlaps.append(overlap)
if m1[1] <= m2[1]:
flp+=1
else:
slp+=1
return overlaps
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