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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6.     int l1, r1, l2, r2;
  7.     cin >> l1 >> r1 >> l2 >> r2;
  8.     // make l1 and r1 represent the left range
  9.     // and  l2 and r2 represent the right range
  10.     if (l1 > l2)
  11.     {
  12.         // swap l1 with l2
  13.         int tmpL = l1;
  14.         l1 = l2;
  15.         l2 = tmpL;
  16.         // swap r1 with r2
  17.         int tmpR = r1;
  18.         r1 = r2;
  19.         r2 = tmpR;
  20.     }
  21.     if (l2 > r1)
  22.     {
  23.         // no intersection between the 2 ranges
  24.         cout << -1;
  25.     }
  26.     else
  27.     {
  28.         // check the start and end of the intersection between the 2 ranges
  29.         int rangeL = l2, rangeR;
  30.         // check the end of the range, it can be r1 or r2 (the least between them)
  31.         if (r1 < r2)
  32.         {
  33.             rangeR = r1;
  34.         }
  35.         else
  36.         {
  37.             rangeR = r2;
  38.         }
  39.         cout << rangeL << " " << rangeR;
  40.     }
  41. }
  42.  
Success #stdin #stdout 0s 5344KB
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Standard input is empty
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-1
https://ideone.com/Ws7zE4
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

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