Language: C++

#include <bits/stdc++.h>
void rep(i,N) for (int i=0;i<N;i++)
using namespace std;


main(){
int N;
  cin>>N;
  vector<int> H(N);
 rep(i.N) cin>>H[i];
  
  int pre =-999;
  rep(i,N) {
    if(pre<=H[i]-1){
      pre=H[i]-1;
    }
    else if(pre<=H[i]){
      pre=H[i];
    }
    else{
      cout<<"NO"<<endl;
      return 0;
    }
  }
  cout<<"YES"<<endl;
  return 0;
}
        

      



Compiler output:
a.cc:2:6: error: variable or field 'rep' declared void
    2 | void rep(i,N) for (int i=0;i<N;i++)
      |      ^~~
a.cc:2:10: error: 'i' was not declared in this scope
    2 | void rep(i,N) for (int i=0;i<N;i++)
      |          ^
a.cc:2:12: error: 'N' was not declared in this scope
    2 | void rep(i,N) for (int i=0;i<N;i++)
      |            ^
a.cc:2:28: error: 'i' does not name a type
    2 | void rep(i,N) for (int i=0;i<N;i++)
      |                            ^
a.cc:2:32: error: 'i' does not name a type
    2 | void rep(i,N) for (int i=0;i<N;i++)
      |                                ^
a.cc:6:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    6 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:8:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    8 |   cin>>N;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:9:3: error: 'vector' was not declared in this scope
    9 |   vector<int> H(N);
      |   ^~~~~~
a.cc:9:3: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:9:10: error: expected primary-expression before 'int'
    9 |   vector<int> H(N);
      |          ^~~
a.cc:10:6: error: 'i' was not declared in this scope
   10 |  rep(i.N) cin>>H[i];
      |      ^
a.cc:10:2: error: 'rep' was not declared in this scope
   10 |  rep(i.N) cin>>H[i];
      |  ^~~
a.cc:25:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   25 |   cout<<"YES"<<endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:25:16: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   25 |   cout<<"YES"<<endl;
      |                ^~~~
      |                std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~