min max from tuples in list

[Robert Voigtländer]

Hi,

I have a list like this:

a = [(52, 193), (52, 193), (52, 192), (51, 193), (51, 191), (51, 190), (51, 189), (51, 188), (50, 194), (50, 187), (50, 186), (50, 185), (50, 184), (49, 194), (49, 183), (49, 182), (49, 181), (48, 194), (48, 180), (48, 179), (48, 178), (48, 177), (47, 194), (47, 176), (47, 175), (47, 174), (47, 173), (46, 195), (46, 172), (46, 171), (46, 170), (46, 169), (45, 195), (45, 168), (45, 167), (45, 166), (44, 195), (44, 165), (44, 164), (44, 163), (44, 162), (43, 195), (43, 161), (43, 160), (43, 159), (43, 158), (42, 196), (42, 157), (42, 156), (42, 155), (41, 196), (41, 154), (41, 153), (41, 152), (41, 151), (40, 196), (40, 150), (40, 149), (40, 148), (40, 147), (39, 196), (39, 146), (39, 145), (39, 144), (39, 143), (38, 196), (38, 142), (38, 141), (38, 140), (37, 197), (37, 139), (37, 138), (37, 137), (37, 136), (36, 197), (36, 135), (36, 134), (36, 133)]


I need to find a -performant- way to transform this into a list with tuples (a[0],[a[0][1]min],[a[0][1]max]).

Hard to explaint what I mean .. [0] of the first three tuples is 52. [1] is 193,193 and 192.
What I need as result for these three tuples is: (52,192,193).

For the next five tuples it is (51,188,193).


Extra challenges:
- This list is sorted. For performance reasons I would like to keep it unsorted.
- There may be tuples where min=max.
- There my be tupples where [0] only exists once. So mix is automatically max


I hope I was able to explain what I mean.

Thanks
Robert