This easy-to-understand and easy-to-code snippet comes handy while taking fast integer (negative as well as positive) inputs in coding competitions and online judges like SPOJ, Codechef etc. The getchar_unlocked() function might not work on some judges like CodeForces, where getchar() can be used instead. Slight modification can be done to make …

fastRead.cpp

inline void fastRead(int n,std::vector<int> &input)
{
	for (int i = 0; i < n; ++i)
	{
		int sign=1;
		register char c=0;
		while(c<'0' || c>'9')
		{
			c=getchar_unlocked();
			if (c=='-')
			{
				sign=-1; c=getchar_unlocked();
			}
			else
				sign=1;
		}

		int x=0;
		do
		{
			x=(x<<3)+(x<<1)+c-'0';
		} while((c=getchar_unlocked())>='0' && c<='9');

		input.push_back(x*sign);
	}
}