Submission #1032603

#	Time	Username	Problem	Language	Result	Execution time	Memory
1032603		Khanhcsp2	Savrsen (COCI17_savrsen)	C++14	120 / 120	568 ms	78932 KiB

savrsen

#include<bits/stdc++.h>
#define el '\n'
#define fi first
#define sc second
#define int ll
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
using namespace std;
using ll=long long;
using ull=unsigned long long;
using ld=long double;
const int mod=1e9+7;
const int N=1e7+11;
int f[N], a, b;
void sol()
{
    cin >> a >> b;
    for(int i=1;i<=b;i++) f[i]=i;
    for(int i=1;i<=b;i++)
    {
        for(int j=i*2;j<=b;j+=i) f[j]-=i;
    }
    int ans=0;
    for(int i=a;i<=b;i++) ans+=abs(f[i]);
    cout << ans;
}
signed main()
{
//    freopen("divisor.INP", "r", stdin);
//    freopen("divisor.OUT", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t=1;
    //cin >> t;
    while(t--)
    {
        sol();
    }
}

• Subtask 1: 120 / 120