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  1. #include <iostream>
  2.  
  3. #define COEF 10000000
  4. #define TEN 10
  5.  
  6. using namespace std;
  7.  
  8. unsigned int arr[] = { 1, 94194688,80754176,28792576,93638144,44194688,16269824,94550272,61946112,68933632,
  9.                        68754176,19323648,22612992,36351232,57997312,66792576,2167808,95748096,88043776,
  10.                        37690112,65638144,99247872,80831232,42968832,38960896,2194688,36401664,29433088,
  11.                        21091328,35679232,40269824,3200512,39416576,62174976,23727104,49750272,52626176,
  12.                        72337664,68916224,93513984,25146112,14722816,60257024,2170112,13989632,28933632,
  13.                        91983872,29619968,23259904,52859904,2354176,61171456,14485248,81225984,93129472,
  14.                        98123648,42294528,83940096,91339008,90945024,77812992,83786752,30308352,33122816,
  15.                        709376,45551232,13495552,4053504,28486912,65094912,93197312,79194112,80894208,
  16.                        48729344,89670656,26832576,59147776,51826688,14217984,72698112,10487808,29000448,
  17.                        21455616,72560128,94383616,23588096,83462144,14917632,85698816,11810304,3083776,
  18.                        84299264,11034368,6525952,27101696,68170112,92235008,45980416,15386112,44244224,
  19.                        3398144 };
  20.  
  21. int main()
  22. {
  23.     int N;
  24.     unsigned long long factorial = 1;
  25.     cin >> N;
  26.  
  27.     int idx = N/COEF;
  28.     factorial = arr[idx];
  29.  
  30.     int start = !N%COEF ? idx*COEF : idx*COEF + 1;
  31.  
  32.     if (N % COEF != 0)
  33.     {
  34.         for(int i = start; i <= N; i++)
  35.         {
  36.             factorial *= i;
  37.  
  38.             while(factorial % TEN == 0) factorial /= TEN;
  39.             factorial %= COEF;
  40.         }
  41.     }
  42.  
  43.     factorial %= TEN*TEN*TEN;
  44.     cout << factorial/(TEN*TEN) << (factorial/TEN)%TEN << factorial%TEN;
  45.     return  0;
  46.  
  47. }
Success #stdin #stdout 0s 4880KB
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https://ideone.com/qBjW4L
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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