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#include <iostream>
 
using namespace std;
 
int main()
{
 
  int W, numP;
  cin >> W >> numP;
 
  int P[numP+2];
  P[0] = 0; P[numP+1] = W;
 
  for (int i = 1; i < numP + 1; i++) {
    cin >> P[i];
  }
 
  bool ans[W] = {false};
  for (int i = 1; i < numP + 2; i++){
    for (int j = i-1; j > 0; j--) {
        ans[P[i] - P[j] - 1] = true;    // Assuming that P[i] is the rightmost wall and computing all possible partitions for it
        cout >> "P[i] = " >> P[i] >> " i = " >> i >>" P[j] = ">> P[j] >> " j = " >>j >> "\n";
    }
  }
 
  for(int i = 0; i < W; i++) {
    if(ans[i]) {
        cout << i+1 << " ";
    }
  }
  cout << endl;
 
  return 0;
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:22:14: error: no match for ‘operator>>’ (operand types are ‘std::ostream {aka std::basic_ostream<char>}’ and ‘const char [8]’)
         cout >> "P[i] = " >> P[i] >> " i = " >> i >>" P[j] = ">> P[j] >> " j = " >>j >> "\n";
         ~~~~~^~~~~~~~~~~~
In file included from /usr/include/c++/6/string:53:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.tcc:1437:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator>>(basic_istream<_CharT, _Traits>& __in,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.tcc:1437:5: note:   template argument deduction/substitution failed:
prog.cpp:22:17: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘std::basic_istream<_CharT, _Traits>’
         cout >> "P[i] = " >> P[i] >> " i = " >> i >>" P[j] = ">> P[j] >> " j = " >>j >> "\n";
                 ^~~~~~~~~
In file included from /usr/include/c++/6/istream:934:0,
                 from /usr/include/c++/6/iostream:40,
                 from prog.cpp:1:
/usr/include/c++/6/bits/istream.tcc:955:5: note: candidate: template<class _CharT2, class _Traits2> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*)
     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
     ^~~~~~~~
/usr/include/c++/6/bits/istream.tcc:955:5: note:   template argument deduction/substitution failed:
prog.cpp:22:17: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘std::basic_istream<_CharT, _Traits>’
         cout >> "P[i] = " >> P[i] >> " i = " >> i >>" P[j] = ">> P[j] >> " j = " >>j >> "\n";
                 ^~~~~~~~~
In file included from /usr/include/c++/6/istream:934:0,
                 from /usr/include/c++/6/iostream:40,
                 from prog.cpp:1:
/usr/include/c++/6/bits/istream.tcc:923:5: note: candidate: template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)
     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
     ^~~~~~~~
/usr/include/c++/6/bits/istream.tcc:923:5: note:   template argument deduction/substitution failed:
prog.cpp:22:17: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘std::basic_istream<_CharT, _Traits>’
         cout >> "P[i] = " >> P[i] >> " i = " >> i >>" P[j] = ">> P[j] >> " j = " >>j >> "\n";
                 ^~~~~~~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:756:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)
     operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
     ^~~~~~~~
/usr/include/c++/6/istream:756:5: note:   template argument deduction/substitution failed:
prog.cpp:22:17: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘std::basic_istream<char, _Traits>’
         cout >> "P[i] = " >> P[i] >> " i = " >> i >>" P[j] = ">> P[j] >> " j = " >>j >> "\n";
                 ^~~~~~~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:761:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char&)
     operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
     ^~~~~~~~
/usr/include/c++/6/istream:761:5: note:   template argument deduction/substitution failed:
prog.cpp:22:17: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘std::basic_istream<char, _Traits>’
         cout >> "P[i] = " >> P[i] >> " i = " >> i >>" P[j] = ">> P[j] >> " j = " >>j >> "\n";
                 ^~~~~~~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:803:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*)
     operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
     ^~~~~~~~
/usr/include/c++/6/istream:803:5: note:   template argument deduction/substitution failed:
prog.cpp:22:17: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘std::basic_istream<char, _Traits>’
         cout >> "P[i] = " >> P[i] >> " i = " >> i >>" P[j] = ">> P[j] >> " j = " >>j >> "\n";
                 ^~~~~~~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:808:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char*)
     operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
     ^~~~~~~~
/usr/include/c++/6/istream:808:5: note:   template argument deduction/substitution failed:
prog.cpp:22:17: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘std::basic_istream<char, _Traits>’
         cout >> "P[i] = " >> P[i] >> " i = " >> i >>" P[j] = ">> P[j] >> " j = " >>j >> "\n";
                 ^~~~~~~~~
In file included from /usr/include/c++/6/iostream:40:0,
                 from prog.cpp:1:
/usr/include/c++/6/istream:924:5: note: candidate: template<class _CharT, class _Traits, class _Tp> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&)
     operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
     ^~~~~~~~
/usr/include/c++/6/istream:924:5: note:   template argument deduction/substitution failed:
prog.cpp:22:17: note:   ‘std::ostream {aka std::basic_ostream<char>}’ is not derived from ‘std::basic_istream<_CharT, _Traits>’
         cout >> "P[i] = " >> P[i] >> " i = " >> i >>" P[j] = ">> P[j] >> " j = " >>j >> "\n";
                 ^~~~~~~~~

Standard output is empty