# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
636417 | berr | Savrsen (COCI17_savrsen) | C++17 | 688 ms | 78708 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#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];
}
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---|---|---|---|---|
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