#include<bits/stdc++.h>
using namespace std;
#define vi vector<int>
#define pii pair<int,int>
#define vii vector<pii>
#define lli long long int
#define pb push_back
#define INF 1000000000
#define endl '\n'

int n=3,m=2;

char d[]={'D','L','R','U'};
int di[]={1,0,0,-1};
int dj[]={0,-1,1,0};
int cnt=0;

int findpaths(int i,int j,vector<vector<int>> v,vector<vector<int>> a)
{
    if(i>=n || j>=m || i<0 || j<0 || v[i][j]==1 ||a[i][j]==0)
        return 0;

    if(i==n-1 && j==m-1)
    {
      //  cout<<s<<endl;
        return 1;
    }
    
    v[i][j]=1;
    
    for(int k=0;k<4;k++)
    {
      cnt+=findpaths(i+di[k],j+dj[k],v,a);
    }
    
    v[i][j]=0;
    
    return cnt;
}
int main()
{

  //cin>>n>>m;
  vector<vector<int>> a(n,vector<int>(m));
  
    for (int i = 0; i < n; i++) {
    for(int j=0;j<m;j++)
    {
      cin>>a[i][j];
    }
  }
  vector<vector<int>> v(n,vector<int>(m,0));
  findpaths(0,0,v,a);


return 0;
}

/*
input:



output:


*/
by

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
}