Add Memory Card Pairs implementation for issue #870

onirestart · web-flow · commit 18817fdd0a32 · 2025-10-15T12:39:23.000+05:30
diff --git a/870_MEMORY_CARD_PAIRS/memory_card_pairs.py b/870_MEMORY_CARD_PAIRS/memory_card_pairs.py
@@ -0,0 +1,85 @@
+import random
+import os
+
+
+def clear_screen():
+    """Clear the terminal screen."""
+    os.system('cls' if os.name == 'nt' else 'clear')
+
+
+def create_board(pairs=8):
+    """Create a board with matching pairs."""
+    symbols = list(range(1, pairs + 1)) * 2
+    random.shuffle(symbols)
+    return symbols, [False] * len(symbols)
+
+
+def display_board(symbols, revealed, selected):
+    """Display the current board state."""
+    clear_screen()
+    print("\nMemory Card Pairs - Match all pairs!\n")
+    for i in range(len(symbols)):
+        if revealed[i] or i in selected:
+            print(f"[{symbols[i]:2}]", end=" ")
+        else:
+            print(f"[{i:2}]", end=" ")
+        if (i + 1) % 4 == 0:
+            print()
+    print()
+
+
+def get_input(prompt, max_val):
+    """Get valid input from user."""
+    while True:
+        try:
+            val = int(input(prompt))
+            if 0 <= val < max_val:
+                return val
+            print(f"Enter a number between 0 and {max_val - 1}")
+        except ValueError:
+            print("Invalid input. Please enter a number.")
+
+
+def play_game():
+    """Main game logic."""
+    symbols, revealed = create_board()
+    attempts = 0
+    matches = 0
+
+    while matches < len(symbols) // 2:
+        display_board(symbols, revealed, [])
+        print(f"Attempts: {attempts} | Matches: {matches}/{len(symbols) // 2}")
+
+        first = get_input("Select first card: ", len(symbols))
+        while revealed[first]:
+            print("Card already matched! Choose another.")
+            first = get_input("Select first card: ", len(symbols))
+
+        display_board(symbols, revealed, [first])
+
+        second = get_input("Select second card: ", len(symbols))
+        while second == first or revealed[second]:
+            if second == first:
+                print("Choose a different card!")
+            else:
+                print("Card already matched! Choose another.")
+            second = get_input("Select second card: ", len(symbols))
+
+        display_board(symbols, revealed, [first, second])
+        attempts += 1
+
+        if symbols[first] == symbols[second]:
+            print("\nMatch found! ✓")
+            revealed[first] = revealed[second] = True
+            matches += 1
+        else:
+            print("\nNo match. Try again.")
+
+        input("Press Enter to continue...")
+
+    display_board(symbols, revealed, [])
+    print(f"\nCongratulations! You won in {attempts} attempts!")
+
+
+if __name__ == "__main__":
+    play_game()
