fastio line code example
Example: fastinput c++
void fastInput(int &x)
{
bool neg=false;
register int c;
x =0;
c=getchar();
if(c=='-')
{
neg = true;
c=getchar();
}
for(;(c>47 && c<58);c=getchar())
//bit shifting is faster than other operation
//here code below is same as
//x = x*10 + c-48
x = (x<<1) + (x<<3) +c -48;
if(neg)
x *=-1;
}