Submission #892080

#	Time	Username	Problem	Language	Result	Execution time	Memory
892080		kh0i	Savrsen (COCI17_savrsen)	C++17	120 / 120	748 ms	78932 KiB

savrsen

/**
 *	author: kh0i
 *	created: 18.03.2022 15:07:12
**/
#include "bits/stdc++.h"
using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...)
#endif

using ll = long long;

const ll N = 1e7 + 2;
ll a, b, f[N];

void solve(){
    cin >> a >> b;
    ll res = 0;
    f[1] = 1;
    for(ll i = 2; i < N; ++i){
        f[i]++;
        for(ll j = i + i; j < N; j += i){
            f[j] += i;
        }
        f[i] = abs(i - f[i]);
    }
    for(ll i = a; i <= b; ++i){
        res += f[i];
    }
    cout << res;
}

int32_t main() {
    cin.tie(nullptr)->sync_with_stdio(0);
    int test = 1;
//    cin >> test;
    for(int i = 1; i <= test; ++i){
        solve();
    }
    cerr << "\nTime elapsed: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
    return 0;
}

// Write stuff down

• Subtask 1: 120 / 120