Add NQueen.py

CONTRIBUTORS.md

@@ -32,5 +32,6 @@ United Kingdom - https://github.com/cu-sanjay/HacktoberFest2023/assets/96792511/
 |[Darshit Dudhaiya](https://github.com/darshitdudhaiya)   | <img src="https://github.com/cu-sanjay/HacktoberFest2023/assets/96792511/5adfd776-ce7e-4467-92dd-727a12239cd1" alt="India" width="32" height="32">   | I'm a Student and full-stack web developer and i enthusiast about coding. |
 |[Naveen Kumar .v](https://github.com/NK-dev-24)    | <img src="https://github.com/cu-sanjay/HacktoberFest2023/assets/96792511/5adfd776-ce7e-4467-92dd-727a12239cd1" alt="India" width="32" height="32">  | I'm a Student. |
 |[Chandan Arya](https://github.com/alpha2lucifer)    | <img src="https://github.com/cu-sanjay/HacktoberFest2023/assets/96792511/5adfd776-ce7e-4467-92dd-727a12239cd1" alt="India" width="32" height="32">  | I am a passionate developer with a keen interest in blockchain technology and decentralized applications. My focus lies in creating efficient and secure solutions, and I enjoy exploring various programming languages and frameworks to build innovative applications.|
+|[Subhikshaa S](https://github.com/Subhikshaa23)    |   <img src="https://github.com/cu-sanjay/HacktoberFest2023/assets/96792511/5adfd776-ce7e-4467-92dd-727a12239cd1" alt="India" width="32" height="32"> | A passionate web developer and a curious learner |
 
 

Python/NQueen.py

@@ -0,0 +1,32 @@
+#N-Queens Problem
+def attack(i, j):
+    for k in range(0,N):
+        if board[i][k]==1 or board[k][j]==1:
+            return True
+    for k in range(0,N):
+        for l in range(0,N):
+            if (k+l==i+j) or (k-l==i-j):
+                if board[k][l]==1:
+                    return True
+    return False
+
+def N_queens(n):
+    if n==0:
+        return True
+    for i in range(0,N):
+        for j in range(0,N):
+            if (not(attack(i,j))) and (board[i][j]!=1):
+                board[i][j] = 1
+                if N_queens(n-1)==True:
+                    return True
+                board[i][j] = 0
+    return False
+
+print ("Enter the number of queens: ")
+N = int(input())
+board = [[0]*N for _ in range(N)]
+
+N_queens(N)
+print("Solution:")
+for i in board:
+    print (i)