Nqueen problem with python

#Number of queens
print ("Enter the number of queens")
N = int(input())

#chessboard
#NxN matrix with all elements 0
board = [[0]*N for _ in range(N)]

def is_attack(i, j):
    #checking if there is a queen in row or column
    for k in range(0,N):
        if board[i][k]==1 or board[k][j]==1:
            return True
    #checking diagonals
    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_queen(n):
    #if n is 0, solution found
    if n==0:
        return True
    for i in range(0,N):
        for j in range(0,N):
            '''checking if we can place a queen here or not
            queen will not be placed if the place is being attacked
            or already occupied'''
            if (not(is_attack(i,j))) and (board[i][j]!=1):
                board[i][j] = 1
                #recursion
                #wether we can put the next queen with this arrangment or not
                if N_queen(n-1)==True:
                    return True
                board[i][j] = 0

    return False

N_queen(N)
for i in board:
    print (i)

Source: codesdope.com

Similar codes

0 vote132 views1 answer
Add checkbox box rows in tabulator
Java
29 votes135 views3 answers
String in java
Java
1 vote138 views2 answers
String comparison using == in java
Java
0 vote140 views1 answer
What singleton java spring
Java
0 vote133 views2 answers
Java print 2d array row and column
Java
3 votes191 views1 answer
What is vector in java
Java
0 vote155 views1 answer
Windows Jmeter java.net.BindException: Address already in use: connect
Java
0 vote145 views1 answer
Java mockito print called methods
Java
0 vote143 views1 answer
For each loop java string array
Java
0 vote134 views1 answer
Keycloak spring boot application.properties
Java