제출 #466900

#제출 시각아이디문제언어결과실행 시간메모리
4669001e9dSavrsen (COCI17_savrsen)C++14
120 / 120
1550 ms78608 KiB
#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; }
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