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If the data really is similar in scope to your sample data, you could create a map like this:

map = [0 .. 150]

for each color:
    for loc range start * 10 to range finish * 10:
        map[loc] = color

Then just walk through this map to generate the ranges

curcolor = none
for loc in map:
    if map[loc] != curcolor:
        if curcolor:
            rangeend = loc
        make new range
        rangecolor = map[locl]
        rangestart = loc
    

To work, the values have to be in a relatively small range as in your sample data.