#include <bits/stdc++.h>
using namespace std;

int dx[4]={0, -1, 0, 1};
int dy[4]={-1, 0, 1, 0};

array<int,2>d8[8] ={{-1,0},{-1,1},{0,1},{1,1},{1,0},{1,-1},{0,-1},{-1,-1}};


void done(){
  int n,m; cin >> n >> m;
  vector<string>g(n);
  vector <vector <int> >d(n+1,vector <int>(m+1,INT_MAX));
  vector <vector<bool> >visit(n+1,vector<bool>(m+1,0));
  for(int i=0;i<n;++i){
    cin >> g[i];
  }
  function<void(int,int,int,int)>bfs=[&](int s, int t, int a, int b){
    vector<vector<int> >d(n+1, vector<int>(m+1,INT_MAX));
    d[s][t]=0;
    deque<pair<int,int> >dq;
    dq.push_front({s,t});
    while(!dq.empty()){
      //auto [x,y]=dq.front();
      int x = dq.front().first;
      int y = dq.front().second;
      dq.pop_front();
      int di = g[x][y]-'0';
     // cerr<<di<<"\n";
      int u = x+d8[di][0], v = y+d8[di][1];
      if(u<0||u>=n||v<0||v>=m)continue;
      if(d[u][v]>d[x][y]){
        d[u][v]=d[x][y];
        dq.push_front({u,v});
      }
      {
        for(array<int,2>i : d8){
          int uu = x+i[0], vv = y+i[1];
          if(uu<0||uu>=n||vv<0||vv>=m)continue;
          if(d[uu][vv]>d[x][y]+1){
            d[uu][vv] = d[x][y]+1;
            dq.push_back({uu,vv});
          }
          
        }
      }
    }
    cout << d[a][b] << endl;
  };
  int k; cin >> k;
  for(;k--;){
    int s,t,a,b; cin >> s >> t >> a >> b;
    bfs(s-1,t-1,a-1,b-1);
  }
  
}

int main() 
{
   ios_base::sync_with_stdio(false);
   cin.tie(nullptr);
   int q=1; //cin >> q;
   while(q--){
    done();
   }
    
    return 0;
}

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}