Задачі
Сума парних на проміжку
test 6 zaman limiti verir for ile yazanda sebebi nedir?
include<iostream>
include<cmath>
using namespace std; int main() { long long a,b; cin>>a>>b; a+=abs(a)%2; b-=abs(b)%2; a-=2; long long e=b/2; long long d=a/2; long long u=e+1; long long r=e*u; long long t=d+1; long long o=d*t; cout<<r-o; return 0; }
include <bits/stdc++.h>
using namespace std; int main(){ long long a,b,c,d; cin>>a>>b; if (a % 2 != 0) a++; if (b % 2 != 0) b--; a /= 2; b /= 2; c = b - a + 1; d = c * (b + a); cout<<d; }