Language: C++

#include <iostream>
#include <utility>
#include <vector>
#include <algorithm>
using namespace std;

const long Max_h = 1000000000;
const long Max_w = 1000000000;
const int Max_n = 100000;
long a[Max_n]; // y
long b[Max_n]; // x
pair<long,long>  p[Max_n];

int main()
{
  int index = 0;
  long count_array[16] = {0};
  long H, W, N;
  cin >> H >> W >> N;
  for (long i = 0; i < N; i++) { cin >> a[i] >> b[i]; }
  // end input

  for (long i = 0; i < N; i++) {
    for (int j = -2; j <= 0; j++) { // たて
      for (int k = -2; k <= 0; k++) { // よこ
        long tmp_x = a[i]+k-1, tmp_y = b[i]+j-1;
        if (tmp_x < 0 || tmp_y < 0 || tmp_x >= H-2 || tmp_y >= W-2) continue;
        p[index++] = make_pair(tmp_x, tmp_y);
      }
    }
  }
  // pairに格納完了

  // pairのソート
  sort(p, p+index);
  //  for (int i = 0; i < index; i++) cout << "=" << p[i].first << " " << p[i].second << \
endl;
/* ライブラリを使う */
  vector<pair<long,long> > p2;
  for (int i = 0; i < index; i++) p2[i] = p[i];
  decltype(p2)::iterator result = unique(p2.begin(),p2.end());
  //p2 = unique(p2,p2+index);
  for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
    count_array[count(p,p+index,p2[i])]++;
  }

  long sum = 0;
  for (int i = 1; i < 10; i++) {
    sum += count_array[i];
  }
  count_array[0] = (H-2)*(W-2)-sum;

  for (int i = 0; i < 10; i++) {
    cout << i << ": " << count_array[i] << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:43:48: error: conversion from 'std::vector<std::pair<long int, long int> >::iterator' to non-scalar type 'std::vector<std::pair<long int, long int>*>' requested
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                        ~~~~~~~~^~
a.cc:43:56: error: no match for 'operator!=' (operand types are 'std::vector<std::pair<long int, long int>*>' and 'std::vector<std::pair<long int, long int> >::iterator')
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                    ~~~ ^~ ~~~~~~~~
      |                                                    |            |
      |                                                    |            std::vector<std::pair<long int, long int> >::iterator
      |                                                    std::vector<std::pair<long int, long int>*>
In file included from /usr/include/c++/14/iosfwd:42,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/postypes.h:197:5: note: candidate: 'template<class _StateT> bool std::operator!=(const fpos<_StateT>&, const fpos<_StateT>&)'
  197 |     operator!=(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:197:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   'std::vector<std::pair<long int, long int>*>' is not derived from 'const std::fpos<_StateT>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
In file included from /usr/include/c++/14/string:43,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/bits/allocator.h:243:5: note: candidate: 'template<class _T1, class _T2> bool std::operator!=(const allocator<_CharT>&, const allocator<_T2>&)'
  243 |     operator!=(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:243:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   'std::vector<std::pair<long int, long int>*>' is not derived from 'const std::allocator<_CharT>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
In file included from /usr/include/c++/14/string:48:
/usr/include/c++/14/bits/stl_iterator.h:455:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  455 |     operator!=(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:455:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   'std::vector<std::pair<long int, long int>*>' is not derived from 'const std::reverse_iterator<_Iterator>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
/usr/include/c++/14/bits/stl_iterator.h:500:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  500 |     operator!=(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:500:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   'std::vector<std::pair<long int, long int>*>' is not derived from 'const std::reverse_iterator<_Iterator>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
/usr/include/c++/14/bits/stl_iterator.h:1686:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator!=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1686 |     operator!=(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1686:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   'std::vector<std::pair<long int, long int>*>' is not derived from 'const std::move_iterator<_IteratorL>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
/usr/include/c++/14/bits/stl_iterator.h:1753:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator!=(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1753 |     operator!=(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1753:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   'std::vector<std::pair<long int, long int>*>' is not derived from 'const std::move_iterator<_IteratorL>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1052:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator!=(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1052 |     operator!=(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1052:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   'std::vector<std::pair<long int, long int>*>' is not derived from 'const std::pair<_T1, _T2>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:651:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  651 |     operator!=(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:651:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   'std::vector<std::pair<long int, long int>*>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
/usr/include/c++/14/string_view:658:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  658 |     operator!=(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:658:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   'std::vector<std::pair<long int, long int>*>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
/usr/include/c++/14/string_view:666:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator!=(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  666 |     operator!=(__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:666:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   '__gnu_cxx::__normal_iterator<std::pair<long int, long int>*, std::vector<std::pair<long int, long int> > >' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
/usr/include/c++/14/bits/basic_string.h:3833:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3833 |     operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3833:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   'std::vector<std::pair<long int, long int>*>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
/usr/include/c++/14/bits/basic_string.h:3847:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3847 |     operator!=(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3847:5: note:   template argument deduction/substitution failed:
a.cc:43:66: note:   mismatched types 'const _CharT*' and 'std::vector<std::pair<long int, long int>*>'
   43 |   for (vector<pair<long,long>* > itr = p2.begin(); itr != p2.end(); itr++) {
      |                                                                  ^
/usr/include/c++/14/bits/basic_string.h:3860:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator!=(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3860 |     operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3860