计算一组Range所覆盖的不重复整数的个数，求 < O(n*n) 的算法。
def cover(rs: Range*):Int = ???
assert(cover(0 to 4, 1 to 5) == 6)
assert(cover(0 to 4, 1 to 3) == 5)
assert(cover(0 to 4, 6 to 7) == 7)
assert(cover(0 to 4, 6 to 7, 2 to 6) == 8)
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August 29, 2015 14:20
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cool !