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  1. #include <iostream>
  2. #include <vector>
  3. #include <map>
  4. #include <string>
  5.  
  6. using namespace std;
  7. const unsigned F = 0, I = 1, L = 2, N = 3, T = 4;
  8.  
  9. bool die(const string & msg) {
  10.     cout << "Fatal Error:" << msg << endl;
  11.     exit(EXIT_FAILURE);
  12. }
  13.  
  14. void filnt(vector<double> & v) {
  15.     v[T] = v[F];
  16.     for (double i = (v[F] + v[I]); i <= (v[L] + v[I]); i += v[I]) {
  17.         v[T] += i;
  18.     }
  19.     cout << "T:" << v[T] << " ";
  20.     v[N] = (2 * v[T]) / (v[F] + v[L]);
  21.     cout << "N:" << v[N] << endl;
  22. }
  23. void finlt(vector<double> & v) {
  24.     v[L] = v[F];
  25.     for (double i = 1; i < v[N]; i++) {
  26.         v[L] += v[I];
  27.     }
  28.     cout << "L:" << v[L] << " ";
  29.  
  30.     v[T] = v[F];
  31.     for (double i = (v[F] + v[I]); i <= (v[L]); i += v[I]) {
  32.         v[T] += i;
  33.     }
  34.     cout << "T:" << v[T] << endl;
  35. }
  36.  
  37. void fitln(vector<double> &) {
  38.     die("not checking this condition");
  39. }
  40.  
  41. void flnit(vector<double> & v) {
  42.     v[I] = (v[L] - v[F]) / (v[N] - 1);
  43.     cout << "I:" << v[I] << " ";
  44.     v[T] = v[F];
  45.     for (double i = (v[F] + v[I]); i <= (v[L] + v[I]); i += v[I]) {
  46.         v[T] += i;
  47.     }
  48.     cout << "T:" << v[T] << endl;
  49. }
  50.  
  51. void fltin(vector<double> & v) {
  52.     v[N] = (2 * v[T]) / (v[F] + v[L]);
  53.     cout << "N:" << v[N] << " ";
  54.     v[I] = (v[L] - v[F]) / (v[N] - 1);
  55.     cout << "I:" << v[I] << endl;
  56. }
  57.  
  58. void ftnil(vector<double> & v) {
  59.     v[L] = ((2 * v[T]) / v[N]) - v[F];
  60.     cout << "L:" << v[L] << " ";
  61.     v[I] = (v[L] - v[F]) / (v[N] - 1);
  62.     cout << "I:" << v[I] << endl;
  63. }
  64.  
  65. void iltfn(vector<double> &) {
  66.     die("not checking this condition");
  67. }
  68. void ilnft(vector<double> & v) {
  69.     v[F] = v[L];
  70.     for (double i = 1; i < v[N]; i++) {
  71.         v[F] -= v[I];
  72.     }
  73.     cout << "F:" << v[F] << " ";
  74.     v[T] = v[F];
  75.     for (double i = (v[F] + v[I]); i <= (v[L]); i += v[I]) {
  76.         v[T] += i;
  77.     }
  78.     cout << "T:" << v[T] << endl;
  79. }
  80.  
  81. void itnfl(vector<double> & v) {
  82.     v[F] = ((v[T] * (2 / v[N])) - ((v[N] - 1)*v[I])) / 2;
  83.     cout << "F:" << v[F] << " ";
  84.     v[L] = ((2 * v[T]) / v[N]) - v[F];
  85.     cout << "L:" << v[L] << endl;
  86. }
  87.  
  88. void lntfi(vector<double> & v) {
  89.     v[F] = ((2 * v[T]) / v[N]) - v[L];
  90.     cout << "F:" << v[F] << " ";
  91.     v[I] = (v[L] - v[F]) / (v[N] - 1);
  92.     cout << "I:" << v[I] << endl;
  93. }
  94.  
  95. void assign(std::vector<double>& v, std::vector<bool>& flags, char c, double value)
  96. {
  97.     switch (c)
  98.     {
  99.         case 'F': case 'f': v[F] = value; flags[F] = true; break;
  100.         case 'I': case 'i': v[I] = value; flags[I] = true; break;
  101.         case 'L': case 'l': v[L] = value; flags[L] = true; break;
  102.         case 'N': case 'n': v[N] = value; flags[N] = true; break;
  103.         case 'T': case 't': v[T] = value; flags[T] = true; break;
  104.     }
  105. }
  106.  
  107. int main()
  108. {
  109.     vector<double> v(5);
  110.     vector<bool> flags = { false, false, false, false, false };
  111.     for (int i = 0; i != 3; ++i) {
  112.         char c;
  113.         double value;
  114.         std::cin >> c >> value;
  115.         assign(v, flags, c, value);
  116.     }
  117.     const std::map<std::vector<bool>, void(*)(std::vector<double> &)> m = {
  118.         {{true, true, true, false, false}, filnt},
  119.         {{true, true, false, true, false}, finlt},
  120.         {{true, false, true, true, false}, flnit},
  121.         {{true, false, true, false, true}, fltin},
  122.         {{true, false, false, true, true}, ftnil},
  123.         {{false, true, true, true, false}, ilnft},
  124.         {{false, true, false, true, true}, itnfl},
  125.         {{false, false, true, true, true}, lntfi}
  126.     };
  127.  
  128.     auto it = m.find(flags);
  129.     if (it == m.end()) {
  130.         std::cout << "Fatal Error: not checking this condition\n";
  131.         return EXIT_FAILURE;
  132.     }
  133.     it->second(v);
  134. }
  135.  
Success #stdin #stdout 0s 15248KB
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https://ideone.com/82Pa7h
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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