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]; }
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