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Cod sursa(job #718208)
#include<iostream>
#include<fstream>
#include<string.h>
using namespace std;
int v[101];
char c[101];
int putere(int x, int n)
{
int i,a;
a=1;
for(i=1;i<=n;i++)
a=(a*x)%10;
return a;
}
int main ()
{
int i,n,t;
ifstream f("cifra.in");
ofstream g("cifra.out");
for(i=0;i<=100;i++)
v[i]=putere(i,i);
for(i=2;i<=100;i++)
v[i]=(v[i]+v[i-1])%10;
f>>t;
for(i=1;i<=t;i++) {
f>>c;
n=strlen(c)-1;
if(n==0)
g<<v[c[n]-48]<<'\n';
else g<<v[(c[n-1]-48)*10+(c[n]-48)]<<'\n';
}
g.close();
return 0;
}