제출 #86389

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
86389		Pluton	Savrsen (COCI17_savrsen)	C++14	0 / 120	47 ms	628 KiB

savrsen

#include <bits/stdc++.h>

#define ld long double
#define ll long long
#define sz size()
#define all(xx) xx.begin(),xx.end()
#define pb push_back
#define in insert
#define er erase
#define S second
#define F first
#define pii pair <int, int>
#define to_be continue
#define mp make_pair
#define stop exit (0)
#define fname ""
#define speed ios_base::sync_with_stdio(0);cin.tie(0)
#define input freopen (fname".in", "r", stdin)
#define output freopen (fname".out", "w", stdout)
//#define int ll
#define N 600000

using namespace std;

const int inf = 1e9 + 123;
const ll INF = 1e18 + 123;
const double pi = acos (-1.0);
const ld eps = 1e-3;

int a, b, ans;

int main ()
{
	speed;
	cin >> a >> b;
	for (int i = 1; i <= 1e7; i ++)
	{
	//	cout << ((b / i - 1) - max (((a - 1) / i - 1), 0)) << endl;
		ans += i * ((b / i - 1) - max (((a - 1) / i - 1), 0));
		if (((b / i - 1)) < 1)
			break;  
	}
	cout << abs ((a + b) * (b - a + 1) / 2 - ans);
}
//Coded by A....

• Subtask 1: 0 / 120