Submission #151314

#	Time	Username	Problem	Language	Result	Execution time	Memory
151314		Linca_Robert	Savrsen (COCI17_savrsen)	C++14	120 / 120	1450 ms	39500 KiB

savrsen

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

const int DIM = 1e7 + 5;
int A, B, f[DIM];
long long ans = 0;
int main(){
    cin >> A >> B;
    for( int i = 1; i <= B; i++ ){
        f[i] -= i;
        for( int j = i + i; j <= B; j += i )
            f[j] += i;
    }
    for( int i = A; i <= B; i++ )
        ans += max( f[i], -f[i] );
    cout << ans << endl;
    return 0;
}

• Subtask 1: 120 / 120