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последняя цифра факториала

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Apr 23rd, 2019
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  1.  long a,r=1;
  2.   cin >> a;
  3.  
  4.   for(long i=1; i<=a; i++)
  5.   {
  6.       r=r*i;
  7.       while(r%10==0)
  8.           r=r/10;
  9.       r=r%1000;
  10.   }
  11.   cout << r%10;
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