UNABLE TO UNDERSTAND THE APPROACH

#1

can you help me with the concept

#2

@akshatsaraswat03
in this problem u are given,
n bridges and u need to tell maximum number of non intersecting beidges .
image

for ex-> here we have 4 bridges
(2,6) , (5,4) , (8,1) ,(10,2)
maximum non intersecting bridges are ->2
i,e (8,1) and (10,2) they will not cross each other.