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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. #define max 1000000000
  5.  
  6. typedef unsigned long long int ull;
  7.  
  8. ull r,t;
  9.  
  10. bool check (int x)
  11. {
  12.      return (((2*x +2*r -1)*x) <= t);
  13. }
  14.  
  15. int check()
  16. {
  17. int low=0, high=max,mid;
  18.  while(low<high)
  19.  {
  20.   mid= (low+ high+1)/2;
  21.   if(check(mid))
  22.    low=mid;
  23.   else 
  24.    high=mid-1;
  25.  }
  26.  return low;
  27. }
  28.  
  29. int main() {
  30. 	// your code goes here
  31. 	int test;
  32. 	cin>>test;
  33. 	for(int i=1;i<=test;i++)
  34. 	{
  35. 	cin>>r>>t;
  36. 	ull ans=check();
  37. 	cout<<"Case #"<<i<<": "<<ans<<endl;
  38. 	}
  39. 	return 0;
  40. }
Success #stdin #stdout 0s 2688KB
comments (?)
stdin
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5
1 9
1 10
3 40
1 1000000000000000000
10000000000000000 1000000000000000000
stdout
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Case #1: 1
Case #2: 2
Case #3: 3
Case #4: 707106780
Case #5: 972
https://ideone.com/zYSv36
language:
C++ 4.3.2 (gcc-4.3.2)
created:
10 years ago
visibility:
public

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