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scope intersectSortedIntArrays_ofs_optimized2. // is allowed to return null when result is empty // ofs is added to elements of b prior to comparison static int[] intersectSortedIntArrays_ofs_optimized2(int[] a, int[] b, int ofs) { int i = 0, j = 0, la = l(a), lb = l(b); // swap if a is longer than b if (la > lb) { int[] temp = a; a = b; b = temp; int temp2 = la; la = lb; lb = temp2; } // special case zero elements if (la == 0) null; // special case one element if (la == 1) ret Arrays.binarySearch(b, a[0]-ofs) >= 0 ? a : null; new IntBuffer buf; recurse(a, b, buf, 0, la, 0, lb); ret buf.toArray(); } svoid #recurse(int[] a, int[] b, int ofs, IntBuffer buf, int aFrom, int aTo, int bFrom, int bTo) { if (aFrom >= aTo || bFrom >= bTo) ret; // nothing to do // start in the middle of a, search this element in b int i = (aFrom+aTo)/2; int x = a[i]; int j = Arrays.binarySearch(b, bFrom, bTo, x-ofs); if (j >= 0) { // element found recurse(a, b, ofs, buf, aFrom, i, bFrom, j); buf.add(x); recurse(a, b, ofs, buf, i+1, aTo, j+1, bTo); } else { j = -j-1; recurse(a, b, ofs, buf, aFrom, i, bFrom, j); recurse(a, b, ofs, buf, i+1, aTo, j, bTo); } } end scope