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Cod sursa(job #282466)
#include<iostream.h>
#include<fstream.h>
#include<iomanip.h>
#include<stdio.h>
#include<math.h>
#include<float.h>
#include<conio.h>
ifstream f("cifra.in");
ofstream g("cifra.out");
int n,i,s,t,c,p,j,k;
void main(){
f>>t;
for(i=1;i<=t;i++){
f>>n;
s=0;
for(k=1;k<=n;k++){
p=1;
for(j=1;j<=k;j++)
p=p*k;
s=s+p;
c=s%10;}
g<<c<<endl;}
}