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Cod sursa(job #575542)
#include<fstream>
#include<iostream>
using namespace std;
char sir[10000000];
int sol[101];
int calc(int uc)
{
int x=1;
for(int i=1;i<=uc;i++)
x=(x*uc)%10;
return (sol[uc-1]+x)%10;
}
int main()
{
int i,n,x;
ifstream f1("cifra.in");
ofstream f2("cifra.out");
sol[0]=0;
for(i=1;i<100;i++)
sol[i]=calc(i);
f1>>n;
for(i=1;i<=n;i++)
{
f1>>sir;
if(strlen(sir)==1) x=sir[0]-48;
else x=10*(sir[strlen(sir)-2]-48)+sir[strlen(sir)-1]-48;
f2<<sol[x]<<'\n';
}
return 0;
}