#include<iostream>
#include<bits/stdc++.h>
#include<queue>
#include<cstring>
#include<algorithm>
using namespace std;
typedef long long LL ;typedef pair < int , int > pii ;
typedef unsigned long long ULL ;
const int N = 3e3+5 , INF = 1e9 + 7  ;const double eps = 1e-4  ;
LL n , m , k ;
string s[ N ] ;
int hh[ N ][ N ] , dst[ N ][ N ] ;
const int dx[] = { 1 , -1 , 0 , 0 } , dy[] = { 0 , 0 , 1 , - 1 };

void bfs( int x , int y ){
    priority_queue< pair < int , pii > > q ;
    q.push( { 0 , { x , y  } } ) ;
    dst[ x ][ y ] = 0 ;
    while( !q.empty() ){
        auto[ cost , e ] = q.top() ;
        cost = -cost ;
        q.pop() ;
        tie( x , y ) = e ;
        if( cost != dst [ x ][ y ] ) continue ;
        for( int i = 0 ; i < 4 ; i ++ ){
            int nx = x + dx[ i ] , ny = y + dy [ i ] ;
            if( nx < 0 || ny < 0 || nx >= n || ny >= m ) continue ;
            if( s[ nx ][ ny ] == '#' ){
                continue ;
            }
            int cdy = max( dst [ x ][ y ] + 1 , hh[ nx ][ ny ] ) ;
            if( dst [ nx ][ ny ] > cdy ){
                dst [ nx ][ ny ] = cdy ;
                q.push( { -cdy , { nx , ny } } ) ;
            }
        }
    }
}

void AC(){
    cin >> n >> m >> k ;
    pii st ;
    for( LL i = k , x , y ; i >= 1 ; i -- ){
        cin >> x >> y ; x -- ; y -- ;
        hh[ x ][ y ] = i ;
        if( i == k ){
            st = { x , y } ;
        }
    }
    for(LL i = 0 ; i < n ;i ++ ){
        cin >> s[ i ] ;
        for(LL j = 0 ; j < m ; ++j ){
            dst[ i ] [ j ] = INF ;
        }
    }
    bfs( st.first , st.second ) ;
    ULL ans = 0 ;
    for( LL i = 0 ; i < n ; i ++ ){
        for( LL j = 0 ; j < m ; j++ ){
            if( dst [ i ][ j ] == INF ) continue ;
            ULL tp = dst [ i ] [ j ] ;
            ans += tp * tp ;
        }
    }
    cout << ans << endl ;
    return ;
}

int main(){
	solve();
    return 0;
}

answer.code: In function ‘void bfs(int, int)’:
answer.code:20:13: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’ [-Wc++17-extensions]
   20 |         auto[ cost , e ] = q.top() ;
      |             ^
answer.code: In function ‘int main()’:
answer.code:70:9: error: ‘solve’ was not declared in this scope
   70 |         solve();
      |         ^~~~~