제출 #150994

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
150994	2019-09-01 14:08:57	SeekingOblivion	Savrsen (COCI17_savrsen)	C++14	120 / 120	1631 ms	39544 KiB

savrsen

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//#include<fstream>
#include<queue>
#include<algorithm>
#include<iostream>
#define fin cin
#define fout cout
using namespace std;
//ifstream fin("date.in");
//ofstream fout("date.out");
int a,b,i,f[10000001],j;
long long sol;
int main()
{
    fin>>a>>b;
    for(i=1;i<=b;i++)
    {
        f[i]-=i;
        for(j=i*2;j<=b;j+=i)
            f[j]+=i;
    }
    for(i=a;i<=b;i++)
        if(f[i]>0) sol+=f[i]; else sol-=f[i];
    fout<<sol;
    return 0;
}
 
 
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• Subtask 1: 120 / 120