utils.hpp
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utils.hpp
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			// utils.hpp is part of lenstoolhpc
			//
			#ifndef __UTILS__
			#define __UTILS__

			void quicksort(int *A, int len)
			{
			if (len < 2) return;
			//
			int pivot = A[len/2];
			//
			int i, j;
			for (i = 0, j = len - 1; ; i++, j--)
			{
			while (A[i] < pivot) i++;
			while (A[j] > pivot) j--;

			if (i >= j) break;

			int temp = A[i];
			A[i] = A[j];
			A[j] = temp;
			}
			//
			quicksort(A, i);
			quicksort(A + i, len - i);
			}

			#endif