Intalnire

#include <iostream>
using namespace std;
int a,b,d,da,db,ob,oba,obb;

int main()
{
    cin>>a>>b;
    if(a>b)
        swap(a,b);
    d=b-a;
    ob=d*(d+1)/2;
    da=d/2;
    db=d-da;
    oba=da*(da+1)/2;
    obb=db*(db+1)/2;
    if(ob<(oba+obb))
        cout<<ob;
    else
        cout<<(oba+obb);
    return 0;
}