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StabCrab Mar 26th, 2019 58 Never
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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <cmath>
  4. using namespace std;
  5. int to10(int from, string number)
  6. {
  7.     int number10 = 0;
  8.     int degree = 0;
  9.     for (int i = number.length() - 1; i >= 0; i--)
  10.     {
  11.         if (number[i] <= '9')
  12.         {
  13.             if (number[i] - 48 >= from || number[i] < 48)
  14.             {
  15.                 cout << "ERROR";
  16.                 return 0;
  17.             }
  18.             number10 += (number[i] - 48) * pow(from, degree);
  19.         }
  20.         else
  21.         {
  22.             if (number[i] - 55 >= from || number[i] > 90)
  23.             {
  24.                 cout << "ERROR";
  25.                 return 0;
  26.             }
  27.             number10 += (number[i] - 55) * pow(from, degree);
  28.         }
  29.         degree++;
  30.     }
  31.  
  32. }
  33. string togiven(int number10, int to)
  34. {
  35.     string numberto;
  36.     while(number10 > 0)
  37.     {
  38.         if (number10 % to <= '9')
  39.             numberto += number10 % to + 48;
  40.         else
  41.             numberto += number10 % to + 55;
  42.         number10 /= to;
  43.     }
  44.     std :: reverse(numberto.begin(), numberto.end());
  45.     return numberto;
  46. }
  47. int main()
  48. {
  49.     int from, to;
  50.     string number;
  51.     cin >> from;
  52.     cin >> to;
  53.     cin >> number;
  54.     if (number == "0" || number == "1")
  55.     {
  56.         cout << number;
  57.         return 0;
  58.     }
  59.     int number10 = to10(from, number);
  60.     string numberto = togiven(number10, to);
  61.     cout << numberto;
  62. }
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