Why I am getting TLE in 4 tcs?

#1

Why I am getting TLE in 4 tcs ?

#2

In the else case, e should be assignmed mid-1 not n-1.

#3

Done, now why i m getting WA in 3 tcs ? https://ide.codingblocks.com/s/223457

#4

replace every int with long long int

#5

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#6

Why ? range is till 10^9 only so int will work ?