Submission #636417

#TimeUsernameProblemLanguageResultExecution timeMemory
636417berrSavrsen (COCI17_savrsen)C++17
30 / 120
688 ms78708 KiB
#include <bits/stdc++.h>
using namespace std;
#define int long long


int32_t main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    vector<int> a(1e7+1);

    for(int i=0; i<1e7+1; i++)
    {
        a[i]=i;
    }

    for(int i=1; i*i<=(1e7+1); i++)
    {
        for(int l=i+i; l<(1e7+1); l+=i)
        {
            a[l]-=i;
        }
    }


    for(int i=1; i<1e7+1; i++)
    {
        if(a[i]<0) a[i]*=-1;
        a[i]+=a[i-1];
    }
    int x, y; cin>>x>>y;

    cout<<a[y]-a[x-1];

}
#Verdict Execution timeMemoryGrader output
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