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  1. t = int(input())
  2.  
  3. for _ in range(t):
  4.   n, a = map(int, input().split())
  5.   l, r, mid, res = 0,  n, -1, -1
  6.   t =  2 * (n * a - n)
  7.   while l <= r:
  8.     mid = (l + r) // 2
  9.     if t >= mid * mid - mid:
  10.       res = mid
  11.       l = mid + 1
  12.     else:
  13.       r = mid - 1
  14.   print(res)
Success #stdin #stdout 0.04s 9552KB
comments (?)
stdin 
3
2 4
5 1
8 4
stdout 
2
1
7
https://ideone.com/0fdUbN
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
public

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