I got accepted but it works slow (0.031),
I want to get solution in one formula
how to do that ?
here's my current solution

#include <iostream>

int main(int argc, char * argv[])
{
    int n1, n2, n3, n4;
    std::cin >> n1 >> n2 >> n3 >> n4;

    if ( n3 < n4 )
    {
        std::cout << n1 * (n4 - n3 - 1) + 2 * n2 * (n4 - n3);
    }
    else
    {
        std::cout << n1 * (n3 - n4 + 1) + 2 * n2 * (n3 - n4);
    }

    return 0;
}

thanks

Edited by author 26.07.2014 16:51

Edited by author 26.07.2014 16:52

Edited by author 26.07.2014 16:53

#include <bits/stdc++.h>

using namespace std;
int a, b, c, d;
int main()
{
  cin >> a >> b >> c >> d;
  cout << ((a + 2 * b) * (d - c - 1) + 2 * b) * (c < d ? 1 : -1);
  return 0;
}