2017.08.25阿里笔试题
from math import sqrt
class Solution(object):
def num(self, k):
x = int(sqrt(2*k))
prenum = x * (x-1) / 2
result = k - prenum
return int(result)
if __name__ == '__main__':
s = Solution() print(s.num(10)) #阿里巴巴#
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