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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4. using namespace std;
  5.  
  6.  
  7. int main(int argc, const char * argv[])
  8. {
  9.     int a[] = { 1,2,3,4,5,6,9,13,14,15 };
  10.  
  11.     string s = "[";
  12.     int m = 1, M = 1;
  13.     for(int i = 1; i < sizeof(a)/sizeof(a[0]); ++i)
  14.     {
  15.         if (a[i] == a[i-1]+1)
  16.         {
  17.             M = a[i];
  18.         }
  19.         else
  20.         {
  21.             s = s + to_string(m);
  22.             if (m < M) s = s + "-" + to_string(M);
  23.             s += ",";
  24.             m = a[i];
  25.         }
  26.     }
  27.     s = s + to_string(m);
  28.     if (m < M) s = s + "-" + to_string(M);
  29.     s += "]";
  30.  
  31.     cout << s << endl;
  32.  
  33. }
  34.  
Success #stdin #stdout 0s 4460KB
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Standard input is empty
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[1-6,9,13-15]
https://ideone.com/K5wGCa
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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