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Cod sursa(job #164102)
#include<stdio.h>
long p(int n){
int j=1,p1=1;
if(n==0) return 0;
else {while(j<=n) {p1=p1*n;j++;}
return p1;
}
}
long s(int n){
if(n==0) return 0;
else return s(n-1)+((p(n))%10);
}
int main(){
long n;
int m=0,x=1,t;
freopen("cifra.in","r",stdin);
freopen("cifra.out","w",stdout);
scanf("%d",&t);
while(x<=t)
{
scanf("%ld",&n);
m=s(n);
printf("%d\n",m%10);
x++;
}
return 0;
}