#include <bits/stdc++.h>
using namespace std; 
typedef unsigned long long ull; 
const int DX[4] = {1, 0, -1, 0}; 
const int DY[4] = {0, 1, 0, -1}; 
const int N = 3005; 
 
int n, m, k; 
char a[3005][3005]; 
int X[N * N], Y[N * N]; 
int d[3005][3005], b[3005][3005]; 
vector<pair<int, int>> q[N * N]; 
 
int main(void) {
    ios::sync_with_stdio(0); 
    cin >> n >> m >> k; 
    for (int i = 1; i <= k; ++i) cin >> X[i] >> Y[i], b[X[i]][Y[i]] = k - i; 
    for (int i = 1; i <= n; ++i) cin >> a[i] + 1; 
 
    memset(d, -1, sizeof d); 
    q[d[X[1]][Y[1]] = 0].emplace_back(X[1], Y[1]); 
    ull ans = 0; 
    for (int c = 0; c < N * N - 1; ++c) for (auto [x, y] : q[c]) {
        ans += 1ll * c * c; 
        for (int i = 0; i < 4; ++i) {
            int xx = x + DX[i], yy = y + DY[i]; 
            if (xx < 1 || yy < 1 || xx > n || yy > m || a[xx][yy] == '#' || d[xx][yy] != -1) continue; 
            q[d[xx][yy] = max(c, b[xx][yy]) + 1].emplace_back(xx, yy); 
        }
    }
 
    cout << ans << '\n'; 
    return 0;
}

answer.code: In function ‘int main()’:
answer.code:18:38: error: no match for ‘operator>>’ (operand types are ‘std::istream’ {aka ‘std::basic_istream<char>’} and ‘char*’)
   18 |     for (int i = 1; i <= n; ++i) cin >> a[i] + 1;
      |                                  ~~~ ^~ ~~~~~~~~
      |                                  |           |
      |                                  |           char*
      |                                  std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/13/sstream:40,
                 from /usr/include/c++/13/complex:45,
                 from /usr/include/c++/13/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:127,
                 from answer.code:1:
/usr/include/c++/13/istream:325:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  325 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/13/istream:325:7: note:   conversion of argument 1 would be ill-formed:
answer.code:18:46: error: cannot bind non-const lvalue reference of type ‘void*&’ to an rvalue of type ‘void*’
   18 |     for (int i = 1; i <= n; ++i) cin >> a[i] + 1;
      |                                         ~~~~~^~~
/usr/include/c++/13/istream:201:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  201 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/13/istream:201:7: note:   conversion of argument 1 would be ill-formed:
answer.code:18:46: error: invalid conversion from ‘char*’ to ‘long long unsigned int’ [-fpermissive]
   18 |     for (int i = 1; i <= n; ++i) cin >> a[i] + 1;
      |                                         ~~~~~^~~
      |                                              |
      |                                              char*
answer.code:18:46: error: cannot bind rvalue ‘(long long unsigned int)(((char*)(& a[i])) + 1)’ to ‘long long unsigned int&’
/usr/include/c++/13/istream:197:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  197 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/13/istream:197:7: note:   conversion of argument 1 would be ill-formed:
answer.code:18:46: error: invalid conversion from ‘char*’ to ‘long long int’ [-fpermissive]
   18 |     for (int i = 1; i <= n; ++i) cin >> a[i] + 1;
      |                                         ~~~~~^~~
      |                                              |
      |                                              char*
answer.code:18:46: error: cannot bind rvalue ‘(long long int)(((char*)(& a[i])) + 1)’ to ‘long long int&’
/usr/include/c++/13/istream:192:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/13/istream:192:7: note:   conversion of argument 1 would be ill-formed:
answer.code:18:46: error: invalid conversion from ‘char*’ to ‘long unsigned int’ [-fpermissive]
   18 |     for (int i = 1; i <= n; ++i) cin >> a[i] + 1;
      |                                         ~~~~~^~~
      |                                              |
      |                                              char*
answer.code:18:46: error: cannot bind rvalue ‘(long unsigned int)(((char*)(& a[i])) + 1)’ to ‘long unsigned int&’
/usr/include/c++/13/istream:188:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]’ (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/13/istream:188:7: note:   conversion of argument 1 would be ill-formed:
answer.code:18:46: error: invalid conversion from ‘char*’ to ‘long int’ [-fpermissive]
   18 |     for (int i = 1; i <= n; ++i) cin >> a[i] + 1;
      |                                         ~~~~~^~~
      |                                              |
      |                                              char*
answer.code:18:46: error: cannot bind rvalue ‘(long int)(((char*)(& a[i])) + 1)’ to ‘long int&’
/usr/include/c++/13/istream:184:7: note: candidate: ‘std::basic_istream<_CharT, _Traits>::__istream_...