$ g++ a31.cpp; a.exe
srand=1141667669
---- Nn=18---- Sn=0---- En=36
0,21.894900
2,22.364600
3,23.244700
4,24.229700
8,25.978700
25,26.523000
334,26.771700
---- Nn=18---- Sn=1---- En=35
0,22.062300
1,23.276000
2,25.725600
4,25.744400
43,25.802400
44,25.812900
67,26.192600
100,26.671200
590,27.080800
1826,27.121100
---- Nn=18---- Sn=2---- En=34
0,24.314600
3,25.582100
13,25.897300
14,26.145900
21,26.668500
63,26.932600
1306,26.938800
1876,26.967800
---- Nn=18---- Sn=3---- En=33
0,22.638700
1,23.550800
2,23.963900
4,24.601500
8,25.449800
22,25.572800
23,25.629300
26,26.963500
245,27.557900
---- Nn=18---- Sn=4---- En=32
0,24.827400
4,26.138800
8,26.571600
27,27.187300
67,27.240000
168,27.513200
789,27.648500
1987,27.780500
---- Nn=18---- Sn=5---- En=31
0,19.473900
1,22.408900
3,24.995800
4,26.524100
14,27.464500
304,27.693600
---- Nn=18---- Sn=6---- En=30
0,22.723700
1,23.646600
2,27.305500
432,27.437400
950,27.787000
---- Nn=18---- Sn=7---- En=29
0,18.998000
1,26.152600
10,26.783600
22,27.310100
65,27.517500
1036,28.038000
---- Nn=18---- Sn=8---- En=28
0,24.198300
2,26.620900
5,26.724700
12,27.231900
80,27.950100
1793,28.305200
---- Nn=18---- Sn=9---- En=27
0,25.222600
3,27.110400
49,27.128800
63,28.266900
125,28.405600
510,28.414400
1201,28.422700
---- Nn=18---- Sn=10---- En=26
0,22.427900
3,24.141000
4,26.054900
5,27.976700
303,28.027100
1011,28.043200
1031,28.128900
1056,28.598400
---- Nn=18---- Sn=11---- En=25
0,21.869100
1,23.358500
2,26.220900
5,27.148400
7,28.190600
342,28.342900
432,28.547800
---- Nn=18---- Sn=12---- En=24
0,26.829900
2,27.363800
5,27.523200
39,27.832700
42,28.318400
103,28.446200
175,28.540800
503,28.614400
702,28.707300
---- Nn=18---- Sn=13---- En=23
0,23.792400
5,26.013900
7,26.474400
8,26.802600
20,27.314400
22,28.233700
44,28.516500
182,28.695100
1202,28.865700
1488,29.009700
---- Nn=18---- Sn=14---- En=22
0,23.677300
1,23.923000
3,24.759800
4,27.463700
6,27.481000
12,28.709000
52,28.772400
162,28.871400
458,29.026800
---- Nn=18---- Sn=15---- En=21
0,27.208600
4,27.582300
8,27.717100
10,27.852700
11,28.260100
29,28.491500
120,28.559400
168,28.635400
250,28.657900
369,29.146100
---- Nn=18---- Sn=16---- En=20
0,22.824000
1,28.112500
6,28.822900
98,29.131700
258,29.149700
945,29.169200
1881,29.362800
---- Nn=18---- Sn=17---- En=19
0,26.743500
1,27.471100
7,27.942600
14,28.300800
32,28.523700
103,28.637000
116,28.914900
224,29.008400
845,29.022200
1107,29.116200
1618,29.181800
---- Nn=18---- Sn=18---- En=18
0,27.451500
3,28.004100
4,28.289900
12,28.887500
60,29.446700
808,29.565000
---- Nn=18---- Sn=19---- En=17
0,27.674600
1,29.101100
80,29.456900
362,29.827400
626,29.830100
---- Nn=18---- Sn=20---- En=16
0,28.035300
1,28.555000
6,28.829300
16,28.864600
36,29.112700
43,29.476300
252,29.573300
378,29.593700
571,29.609700
1252,29.817100
---- Nn=18---- Sn=21---- En=15
0,26.013000
1,27.287200
3,27.342100
8,28.251300
11,29.166000
12,29.332500
57,29.649100
525,29.784500
565,29.813800
1255,29.870600
1511,30.205700
---- Nn=18---- Sn=22---- En=14
0,26.381000
2,27.101300
3,27.408200
4,29.848100
407,29.975400
937,30.316800
---- Nn=18---- Sn=23---- En=13
0,26.265100
1,28.371900
11,29.034400
17,29.181400
25,29.358600
59,29.827000
975,29.952700
1126,30.217900
1849,30.358800
---- Nn=18---- Sn=24---- En=12
0,25.128600
1,27.378300
4,27.592600
5,29.564700
44,29.833900
100,29.867100
121,29.945500
251,30.085900
424,30.184500
763,30.188400
---- Nn=18---- Sn=25---- En=11
0,26.122300
1,27.872500
3,28.431500
4,29.237100
5,29.803500
81,29.883200
194,29.969800
306,29.992600
334,30.035300
533,30.197700
1167,30.212700
1234,30.223500
1284,30.289000
---- Nn=18---- Sn=26---- En=10
0,28.468900
2,29.466400
3,29.904700
35,30.364100
742,30.488600
---- Nn=18---- Sn=27---- En=9
0,21.637000
1,28.789600
3,29.099100
4,30.429500
5,30.518100
92,30.653200
1370,30.851900
---- Nn=18---- Sn=28---- En=8
0,27.583400
1,29.485600
3,29.668900
17,29.684700
25,30.853800
530,30.931300
---- Nn=18---- Sn=29---- En=7
0,29.176700
2,30.141700
42,30.824500
471,30.886600
---- Nn=18---- Sn=30---- En=6
0,28.864100
1,29.792100
8,30.341500
67,30.664500
199,30.703700
460,31.016000
---- Nn=18---- Sn=31---- En=5
0,29.046700
6,29.250800
7,29.524500
9,29.684900
11,29.988200
15,30.348700
53,30.540800
155,30.646900
261,31.045100
1838,31.152200
---- Nn=18---- Sn=32---- En=4
0,21.114800
1,29.328500
4,29.645300
12,30.168200
26,30.312100
80,30.401000
83,30.862800
261,31.085900
---- Nn=18---- Sn=33---- En=3
0,30.060900
8,30.142800
17,30.199400
24,30.688700
28,31.026000
81,31.043000
99,31.100900
685,31.101700
982,31.244700
1049,31.283600
1268,31.287900
---- Nn=18---- Sn=34---- En=2
0,29.319700
2,29.661700
8,29.763400
10,31.173800
707,31.306800
849,31.319500
---- Nn=18---- Sn=35---- En=1
0,29.603800
2,30.368700
3,30.475300
13,30.547800
25,30.623500
28,30.681200
37,30.909800
51,31.065500
54,31.200900
83,31.423000
258,31.440200
726,31.623300
---- Nn=18---- Sn=36---- En=0
0,29.565200
1,30.213400
4,30.454300
16,30.465000
31,30.590800
56,30.613400
74,30.686800
187,30.807500
199,31.141400
249,31.154500
273,31.290300
368,31.437000
416,31.491400
731,31.661600