coordinate compression
It would be easier to use Numpy, but I'm working on a policy of not using it, so I put it in the library.
code:python
class CoordinateCompression:
def __init__(self):
self.values = []
def add(self, x):
self.values.append(x)
def compress(self):
self.values.sort()
x2i = {}
for i, x in enumerate(self.values):
self.x2i = x2i
self.i2x = self.values
return self.x2i, self.i2x
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