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Cod sursa(job #355285)
#include <fstream>
#include <iostream>
#include <math.h>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int main()
{
int t;
f>>t;
for(int y=1;y<=t;y++)
{
int n,s=0,p=1,c,i,r;
f>>n;
r=n%10;
n-=r;
c=n/10;
s=c*7;
s%=10;
for(c=1;c<=r;c++)
{
p=1;
for(i=1;i<=n+c;i++)
{
p*=(n+c);
p%=10;
}
s+=p;
s%=10;
}
g<<s<<endl;
}
return 0;
}