Submission #466900

#	Time	Username	Problem	Language	Result	Execution time	Memory
466900		1e9d	Savrsen (COCI17_savrsen)	C++14	120 / 120	1550 ms	78608 KiB

savrsen

#include <bits/stdc++.h>
using namespace std;

long long mp[10000001];
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    //freopen("ws.INP", "r", stdin);
	//freopen("ws.OUT", "w", stdout);

	memset(mp, 0, sizeof mp);
	int a, b; cin >> a >> b;
	long long res = 0;
    for (int i = 1; i <= b; i++) {
        mp[i] += i;
        if (i >= a) res += abs(mp[i]);
        for (int j = i * 2; j <= b; j += i)
            mp[j] -= i;
    } cout << res;
    return 0;
}

• Subtask 1: 120 / 120