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Benchmark: timing 2500 iterations of grepGen, mapGen, smartGen...
grepGen: 34 wallclock secs (34.35 usr + 0.00 sys = 34.35 CPU) @ 72
+.78/s (n=2500)
mapGen: 14 wallclock secs (14.09 usr + 0.00 sys = 14.09 CPU) @ 17
+7.47/s (n=2500)
...
1 12 15 18 19 20 21 22 23 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
+ 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
+ 64 65 66 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
+ 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 104 105 106 107 108
+109 110 111 112 113 114 116 117 118 119
smart:
0 1 2 3 5 7 8 9 12 13 15 16 18 19 21 22 23 25 26 27 28 29 30 31 32 33
+34 35 36 37 38 39 42 43 44 45 46 47 48 51 52 53 54 55 56 57 58 59 60
+61 62 63 64 65 66 68 69 70 71 72 73 74 75 76 77 78 79 81 83 84 85 86
+87 89 90 91 92 93 94 95 96 97 98 100 101 102 104 105 106 107 108 109
+110 111 112 113 116 117 118 119