Cod sursa(job #2330329)
Utilizator | Data | 28 ianuarie 2019 11:26:51 | |
---|---|---|---|
Problema | Sum | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.46 kb |
#include <iostream>
#include <fstream>
using namespace std;
ifstream in("sum.in");
ofstream out("sum.txt");
#define size 100001
int phi[size];
int main(){
int n ,x;
for(int i = 2; i<=size; ++i)
phi[i] = i-1;
for(int i = 2;2*i<=size;++i){
for(int j = i+i;j<=size;j+=i)
phi[j] -= phi[i];
}
in >> n;
for(int i = 1;i<=n;++i){
in >> x;
cout<<2*x*phi[x]<<'\n';
}
}