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Cod sursa(job #378913)
#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
int main()
{int u[22],t,i,rez,r,c,n,x;
char s[101];
u[0]=0;
u[1]=1;
u[2]=5;
u[3]=2;
u[4]=8;
u[5]=3;
u[6]=9;
u[7]=2;
u[8]=8;
u[9]=7;
u[10]=7;
u[11]=8;
u[12]=4;
u[13]=7;
u[14]=3;
u[15]=8;
u[16]=4;
u[17]=1;
u[18]=5;
u[19]=4;
ifstream f("cifra.in");
ofstream g("cifra.out");
f>>t;
for(i=1;i<=t;i++)
{ f>>s;
x=strlen(s);
if (x>=2) n=(s[x-2]-'0')*10+s[x-1]-'0';
else n=s[0]-'0';
r=n%20;
c=n/20;
rez=((4*c)+u[r])%10;
g<<rez<<"\n";
}
f.close();
g.close();
return 0;
}