Fast I/O in cpp (for Enormous Dataset on spoj)

fastIO.cpp

#include <bits/stdc++.h>
using namespace std;
#define usingcincout ios::sync_with_stdio(0);cin.tie(0);

template <class T>
void getInt(T& n) {
    n = 0;
    int sign=1;
    register char c=0;
    while(c<33)
        c=getchar_unlocked();
    if (c=='-'){
        sign=-1;
        c=getchar_unlocked();
    }
    while(c>='0'&&c<='9'){
        n=(n<<3)+(n<<1)+(c-'0');
        c=getchar_unlocked();
    } n *= sign;
}

template <class T>
void printInt(T a) {
    char num[20];
    int i = 0;
    if(a < 0) {
        putchar_unlocked('-');
        a *= -1;
    }
    do {
        num[i++] = a%10 + 48;
        a /= 10;
    }  while (a != 0);
    i--;
    while (i >= 0)
        putchar_unlocked(num[i--]);
}


inline void ReadStr(char *str)
{
    register char c=0;
    register int i = 0;
    while (c < 33)
        c = getchar_unlocked();
    while (c > 65)
    {
        str[i] = c;
        c = getchar_unlocked();
        i = i + 1;
    }

    str[i] = '\0';
}


inline void printString(char* s)
{
    while(*s)
        putchar_unlocked(*(s++));
}

int main(int argc, char *argv[])
{
    int32_t t;
	printString("Enter a  number");
	getInt(t);
	printInt(t);
	return 0;
}