Submission #226277

#	Time	Username	Problem	Language	Result	Execution time	Memory
226277		quocnguyen1012	Savrsen (COCI17_savrsen)	C++14	0 / 120	115 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 = 1ll * a * (a + 1);
  for(int d = 1; d <= a; ++d){
    res -= 1ll * (a / d) * d;
  }
  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 << abs(solve(b) - solve(a - 1));
}

• Subtask 1: 0 / 120