#include <bits/stdc++.h>
#define not_be_python ios_base::sync_with_stdio(0); cin.tie(0);
#define all(x) x.begin(), x.end()
#define ptall(x) x, x+ sizeof(x)/sizeof(x[0])
#define ms(x, val) memset(x, val, sizeof(x))
#define F first
#define S second
using namespace std;
typedef long long ll;
typedef double db;
typedef long double ldb;
typedef string str;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const ll MAX= 2e5+10, P= 1e9+7, INF= 1e18;
const vector<vector<int>> dir= {{-1, 0}, {1, 0}, {0, -1}, {0, 1}};

int n;
vector<ll> v;
vector<ll> s;
void rec(int d, vector<ll> c){
  if (d== n){
    ll val= 0;
    for (auto i: c){
      val^= i;
    }
    s.push_back(val);
  }else{
    for (int i= 0; i< c.size(); i++){
      c[i]+= v[d];
      rec(d+ 1, c);
      c[i]-= v[d];
    }
    c.push_back(v[d]);
    rec(d+ 1, c);
  }
}

int main(){
	not_be_python;
	cin>> n;
	v.resize(n);
	for (int i= 0; i< n; i++){
	  cin>> v[i];
	}
	rec(0, vector<ll> (0));
	sort(all(s));
  s.resize(unique(all(s))- s.begin());
	cout<< s.size();
	return 0;
}
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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
}