#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int maxn=1e7+5;
ll n,k,ans=0;
string s;
vector<ll>v;
vector<ll>::iterator it;
void init(){
   ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
  // freopen("NHATKY.INP","r",stdin);
  // freopen("NHATKY.OUT","w",stdout);
}
void inp(){
  cin>>n;
  cin.ignore();
  getline(cin,s);
  cin>>k;
}
ll change(string x){
    stringstream change;
    change<<x;
    ll ans;
    change>>ans;
    return ans;
}
int main(){
    init();
    inp();
    s+='a';
    for(int i=0;i<s.size();++i){
        string tmp="";
        while(s[i]>='0' && s[i]<='9' || s[i]=='-'){
                tmp+=s[i];
                i++;
        }
        if(tmp.size()>0)
        v.push_back(change(tmp));
    }
    sort(v.begin(),v.end());
    for (int i=0;i<v.size();++i)
      cout << v[i] << " ";
    cout << endl;
    for(int i=1;i<=v.size();++i){
            ll tmp=k-v[i];
        auto l=lower_bound(v.begin(),v.end(),tmp);
        auto r=upper_bound(v.begin(),v.end(),tmp);
        cout<<(*l)<<" "<<(*r) <<'\n';
      if(l!=v.end())ans+=(r-l+1);
cout<<tmp<<endl;
    }
    // if(ans%2!=0)cout<<(ans+1)/2;
    cout<<ans+1/2;
  return 0;
}
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
}