제출 #1055380

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1055380		fryingduc	Savrsen (COCI17_savrsen)	C++17	120 / 120	474 ms	78712 KiB

savrsen

/* #pragma GCC optimize("Ofast,unroll-loops") */
#include "bits/stdc++.h"
using namespace std;

#ifdef duc_debug
#include "bits/debug.h"
#else 
#define debug(...)     
#endif

/* #define int long long */

const int mod = 1e7+7;
long long s[mod], b, a;
void sieve(){
    s[1] = 1;
    for(int i = 2; i <= 1e7; i++){
        s[i]++;
        for(int j = i * 2; j <= 1e7; j += i){
            s[j] += i;
        }
        s[i] = abs(i - s[i]);
    }
    for(int i = 1; i <= 1e7; i++) s[i] += s[i-1];
}
void solve(){
    cin >> a >> b;
    cout << s[b] - s[a-1] << '\n';

     debug(1000 * clock() / CLOCKS_PER_SEC);
}
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    sieve();

    int test = 1;
    /* cin >> test; */
    for(int i = 1; i <= test; i++){
        /* cout << "Case " << "#" << i << ": "; */
        solve();
    }

    return 0;
}

• Subtask 1: 120 / 120