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Jan 25th, 2020
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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4. ifstream fin("afin.in");
  5. ofstream fout("afin.out");
  6.  
  7. int main()
  8. {
  9. int a, b, i, n, x=97, v[30];
  10. char s[10001];
  11. fin>>a>>b;
  12. fin>>s;
  13. n=strlen(s);
  14.  
  15. for(i=0; i<=25; i++)
  16. {
  17. char ch=x;
  18. v[int(ch)-97]=i;
  19. x++;
  20. }
  21.  
  22. for(i=0; i<n; i++)
  23. {
  24. int nr=(a*v[int(s[i])-97]+b)%26;
  25. fout<<char(nr+97);
  26. }
  27. return 0;
  28. }
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