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  1. n = int(input())
  2. i = 1
  3. if n == 1:
  4.     print('1/1')
  5. else:
  6.     while True:
  7.         if (i*(i+1))/2 < n <= ((i+1)*(i+2))/2:
  8.             break
  9.         i += 1
  10.  
  11.     alist = []
  12.     for a in range(1, i+2):
  13.         alist.append(str(i+2-a)+"/"+str(a))
  14.     answer = int(n-int((i*(i+1))/2)-1)
  15.     print(alist[answer])
Success #stdin #stdout 0.03s 9784KB
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2/1
https://ideone.com/m2r3ZS
language:
Python 3 (python  3.9.5)
created:
30 days ago
visibility:
public

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