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

int Lcounts[100002], Rcounts[100002];
long long zck(int A[], int n)
{
  long long ans = 0;
  if (n == 1)
    return ans;
  
  int mid = n / 2, i = mid-1, j = mid;
  int Allmin = min(A[i], A[j]);
  Lcounts[A[i]] = 1;
  Rcounts[A[j]] = 1;
  if (abs(A[i] - A[j]) == Allmin)
    ans = 1;
    
  for(int k = 0; k < n-2; k++){
    if (i == 0){
      Allmin = min(Allmin, A[++j]);
      Rcounts[A[j]]++;
      ans += Lcounts[min(A[j] + Allmin, 100001)];
      ans += Lcounts[A[j] - Allmin];
    }else if (j == n-1){
      Allmin = min(Allmin, A[--i]);
      Lcounts[A[i]]++;
      ans += Rcounts[min(A[i] + Allmin, 100001)];
      ans += Rcounts[A[i] - Allmin];
    }else{
      if (min(A[i-1],Allmin) > min(A[j+1],Allmin)){
        Allmin = min(Allmin, A[--i]);
        Lcounts[A[i]]++;
        ans += Rcounts[min(A[i] + Allmin, 100001)];
        ans += Rcounts[A[i] - Allmin];
      }else{
        Allmin = min(Allmin, A[++j]);
        Rcounts[A[j]]++;
        ans += Lcounts[min(A[j] + Allmin, 100001)];
        ans += Lcounts[A[j] - Allmin];
      }
    }  
  }
  
  for (int k = 0; k < mid; k++){
    Lcounts[A[k]] = 0;
  }
  for (int k = mid; k < n; k++){
    Rcounts[A[k]] = 0;
  }
  
  ans += (zck(A, mid) + zck(A + mid, n - mid));
  return ans;
}

void Read(int & p)
{
	p=0;
	int flag=1;
	char c=getchar();
	while(c<'0' or c>'9') 
	{
		if(c=='-') flag=-1;
		c=getchar();
	}
	while(c>='0' and c<='9')
		p=p*10+(c-'0'),c=getchar();
	p*=flag;
}

int main() 
{     
  int N;
  Read(N);
  int A[N];
  for (int i = 0; i < N; i++){
    Read(A[i]);
  }
  
  cout << zck(A,N);
}

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
}