Integral Part of Square Root

[S18LPC-OL0031 (Shrey Agarwal)]

code: https://ide.geeksforgeeks.org/9htOmEeIIR
Ques :https://hack.codingblocks.com/contests/c/452/191
My one test case is not getting passed.

[O17LPOLC0033 (ABHISHEK RANJAN)]

Intialised s with zero and dat’s it .