제출 #226275

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
226275		quocnguyen1012	Savrsen (COCI17_savrsen)	C++14	0 / 120	114 ms	384 KiB

savrsen

#include <bits/stdc++.h>

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define ar array

using namespace std;
typedef long long ll;
typedef pair<int, int> ii;

const int maxn = 1e6 + 5, inf = 1e9;

ll solve(int a)
{
  ll res = a * (a + 1) / 2;
  for(int d = 1; d <= a; ++d){
    res -= 1ll * d * (a / d - 1);
  }
  return res;
}

signed main(void)
{
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  #ifdef LOCAL
    freopen("A.INP", "r", stdin);
    freopen("A.OUT", "w", stdout);
  #endif // LOCAL
  int a, b;
  cin >> a >> b;
  cout << solve(b) - solve(a - 1);
}

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