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Cod sursa(job #862476)
#include <stdio.h>
#include <string.h>
#include <fstream>
using namespace std;
int calc(int nr)
{
int i,j,s,p;
s=0;
for(i=1;i<=nr;i++)
{
p=1;
for(j=1;j<=i;j++)
p=(p*i)%10;
s=(s+p)%10;
}
return s;
}
int main()
{
int t,i,nr,v[101];
char a[101];
ifstream f("cifra.in");
ofstream g("cifra.out");
for(i=0;i<=100;i++)
v[i]=calc(i);
f>>t;
for(i=1;i<=t;i++)
{
f>>a;
nr=strlen(a);
if(nr>=2)
nr=(a[nr-2]-'0')*10 + a[nr-1]-'0';
else nr= a[nr-1]-'0';
g<<v[nr]<<"\n" ;
}
return 0;
}