Cod sursa(job #2350920)
Utilizator | Victor Ciobanu _Victor_ | Data | 21 februarie 2019 20:08:19 |
---|---|---|---|
Problema | Sum | Scor | 5 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.43 kb |
#include <bits/stdc++.h>
#define ll long long
#define NMAX 100010
using namespace std;
ll P[NMAX];
void phi(){
for(int i=2;i<=NMAX;i++)P[i]=i-1;
for(int i=2;i<=NMAX;i++){
for(int j=i;j<=NMAX;j+=i){
int c=P[j]/i;
P[j]-=c;
}
}
}
int main(){
ifstream cin("sum.in");
ofstream cout("sum.out");
int n;
cin>>n;
phi();
while(n--){
int x;
cin>>x;
cout<<2*x*P[x]*1LL<<'\n';
}
return 0;
}