added solution for simple mastermind

VL03-04-02/main.cc

@@ -0,0 +1,58 @@
+#include <iostream>
+
+int main() {
+  std::string coder = "";
+  std::string encoder = "";
+  const int max_attempts = 8;
+  int attempts = max_attempts;
+
+  std::cout << "~~ Mastermind ~~" << std::endl;
+  std::cout << std::endl;
+  std::cout << "Konfiguration:" << std::endl;
+  std::cout << "\tFarben: 8 (1 bis 8)" << std::endl;
+  std::cout << "\tCodelänge: 4" << std::endl;
+  std::cout << "\tMehrfache Farben: Nein" << std::endl;
+  std::cout << "\tVersuche: " << max_attempts << std::endl;
+  std::cout << std::endl;
+
+  std::cout << "Kodierer: ";
+  std::cin >> coder;
+
+  for (int i = 0; i < 10; i++) {
+    std::cout << std::endl;
+  }
+
+  while (encoder != coder && attempts > 0) {
+    int current_attempt = (max_attempts - attempts) + 1;
+    std::cout << "Versuch " << current_attempt << " von " << max_attempts << ": ";
+    std::cin >> encoder;
+
+    std::string feedback = "";
+    int black = 0;
+    int white = 0;
+
+    for (int i = 0; i < coder.length(); i++) {
+      if (encoder[i] == coder[i]) {
+        black++;
+      } else {
+        if (coder.find(encoder[i]) != std::string::npos) {
+          white++;
+        }
+      }
+    }
+
+    attempts -= 1;
+    
+    if (encoder == coder) {
+      std::cout << std::endl << "Du hast gewonnen!" << std::endl;
+    } else {
+      std::cout << "Feedback: " << std::string(black, 'B') << std::string(white, 'W') << std::endl;
+
+      if (current_attempt == max_attempts) {
+        std::cout << std::endl << "Du hast keine Versuche mehr!" << std::endl;
+      }
+    }
+  }
+
+  return 0;
+}