Merge pull request steam-bell-92#1090 from Saloni885/main

👑 Added N-Queens Problem Solver (Console + Web App)

Author: steam-bell-92

utilities/N-Queens/N-Queens.py

@@ -0,0 +1,42 @@
+def print_board(board, n):
+    for row in board:
+        print(" ".join("♛" if col else "⬜" for col in row))
+    print()
+
+def is_safe(board, row, col, n):
+    # Check column
+    for i in range(row):
+        if board[i][col]:
+            return False
+    # Check upper-left diagonal
+    for i, j in zip(range(row, -1, -1), range(col, -1, -1)):
+        if board[i][j]:
+            return False
+    # Check upper-right diagonal
+    for i, j in zip(range(row, -1, -1), range(col, n)):
+        if board[i][j]:
+            return False
+    return True
+
+def solve(board, row, n, solutions):
+    if row == n:
+        solutions.append([r[:] for r in board])
+        return
+    for col in range(n):
+        if is_safe(board, row, col, n):
+            board[row][col] = 1
+            solve(board, row + 1, n, solutions)
+            board[row][col] = 0
+
+def main():
+    n = int(input("Enter board size (n): "))
+    board = [[0]*n for _ in range(n)]
+    solutions = []
+    solve(board, 0, n, solutions)
+
+    print(f"Total solutions for {n}-Queens: {len(solutions)}\n")
+    for sol in solutions:
+        print_board(sol, n)
+
+if __name__ == "__main__":
+    main()

web-app/index.html

@@ -574,6 +574,19 @@ <h2 class="playground-title">🐍 Python Playground</h2>
             </p>
           </div>
 
+                <div class="project-card" data-project="nqueens" data-category="utilities">
+                <div class="card-icon">👑</div>
+                <h3>N-Queen Problem Solver</h3>
+                <p>Place queens safely on the board using backtracking.</p>
+                 <button class="btn-play">Try It</button>
+                </div>
+
+
+                <div class="project-card" data-category="utilities" data-project="tower-of-hanoi">
+                    <div class="card-icon">🗼</div>
+                    <h3>Tower of Hanoi</h3>
+                    <p>Solve the classic puzzle!</p>
+                    <button class="btn-play">Try It</button>
           <div class="playground-body">
             <div class="editor-panel">
               <div class="panel-header">