제출 #109146

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
109146		bibabas	Savrsen (COCI17_savrsen)	C++14	120 / 120	1853 ms	39568 KiB

savrsen

#ifdef LOCAL
#define _GLIBCXX_DEBUG
#endif
#include <bits/stdc++.h>
#define ll long long
#define vi vector<int>
#define vvi vector<vi>
#define all(x) x.begin(), x.end()
#define pb push_back
#define mp make_pair

int INF = (int)2e9;

using namespace std;

template <class T>
istream& operator >>(istream &in, vector<T> &arr) {
    for (T &cnt : arr) {
        in >> cnt;
    }
    return in;
};

int sum[(int)1e7 + 1];

void solve() {
    sum[1] = 0;
    int a, b; cin >> a >> b;
    ll ans = 0;
    for (int i = 1; i <= (int)1e7; ++i){
        if (a <= i && i <= b)
            ans += abs(sum[i] - i);
        for (int j = 2 * i; j <= (int)1e7; j += i){
            sum[j] += i;
        }
    }
    cout << ans;
}

int main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#else
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
#endif

    solve();

    return 0;
}

• Subtask 1: 120 / 120