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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int f(int n, int k) {
  5.     if (!n) return 0;
  6.     int tmp = 1 << (n - 1);
  7.     if (k < tmp) return f(n - 1, k);
  8.     return tmp + f(n - 1, (1 << n) - 1 - k);
  9. }
  10.  
  11. int main() {
  12.     int N, n, k;
  13.     cin >> N;
  14.     for (int i = N; i > 0; i--)  {
  15.         cin >> n >> k;
  16.         cout << f(n,k) << endl;
  17.     }
  18.     return 0;
  19. }
Success #stdin #stdout 0s 15232KB
comments (?)
stdin
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14
1 0
1 1
2 0
2 1
2 2
2 3
3 0
3 1
3 2
3 3
3 4
3 5
3 6
3 7
stdout
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0
1
0
1
3
2
0
1
3
2
6
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5
4
https://ideone.com/DOfome
14
1 0
1 1
2 0
2 1
2 2
2 3
3 0
3 1
3 2
3 3
3 4
3 5
3 6
3 7
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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