Doubt in fast modulo exponentiation

#1

sir my code is giving runtime error whenenever ans%m is done why is that so link is https://ide.codingblocks.com/s/138892

#2

Here’s the problem
When you do
a=(a*a); //problem
a=(a%m);

‘a’ might overflow.

So we shall use this:
a=((a%m)*(a%m))%m; //property of modulo

#3

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