INRC–II 4Weeks Updated Results

This article deals with the nurse scheduling problem as described in the context of the international
competition INRC–II.The experimental tests focus on a benchmark of twenty instances published during the INRC–II.The instances describe the constraints for the schedule of 30 to 120 nurses over 4 weeks horizon. Table below shows the result obtained by my developping solver.
Significant improvements can be observed compared to staticnurseschduler. The verified data will be published in Github,which includes mps format for such as cplex/gurobi and wcnf(dimacs) format.

	Known Best			New Solver
	LB	UB	UB-LB/LB	LB	UB	UB-LB/LB
n030w4 1 6-2-9-1	1615	1685	4.2%	1660	1670	0.6%
n030w4 1 6-7-5-3	1740	1840	5.4%	1810	1815	0.3%
n035w4 0 1-7-1-8	1250	1415	11.7%	1338	1360	1.6%
n035w4 2 8-8-7-5	1045	1145	8.7%	1080	1080	0.0%
n040w4 0 2-0-6-1	1335	1640	18.6%	1536	1570	2.2%
n040w4 2 6-1-0-6	1570	1865	15.8%	1742	1750	0.5%
n050w4 0 0-4-8-7	1195	1445	17.3%	1296	1320	1.8%
n050w4 0 7-2-7-2	1200	1405	14.6%	1303	1315	0.9%
n060w4 1 6-1-1-5	2380	2465	3.4%	2435	2450	0.6%
n060w4 1 9-6-3-8	2615	2730	4.2%	2665	2675	0.4%
n070w4 0 3-6-5-1	2280	2430	6.2%	2371	2380	0.4%
n070w4 0 4-9-6-7	1990	2125	6.4%	2105	2115	0.5%
n080w4 2 4-3-3-3	3140	3320	5.4%	3292	3300	0.2%
n080w4 2 6-0-4-8	3045	3240	6.0%	3178	3190	0.4%
n100w4 0 1-1-0-8	1055	1230	14.2%	1168	1175	0.6%
n100w4 2 0-6-4-6	1470	1855	20.8%	1790	1790	0.0%
n110w4 0 1-4-2-8	2210	2390	7.5%	2322	2330	0.3%
n110w4 0 1-9-3-5	2255	2525	10.7%	2455	2455	0.0%
n120w4 1 4-6-2-6	1790	2165	17.3%	2032	2040	0.4%
n120w4 1 5-6-9-8	1820	2220	18.0%