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我正在尝试用2D数组来完成nQueens拼图问题。我无法检查当前元素的对角元素是否被占用?我试着做另一个for循环,但它只改变了下一行的输出,其余的都是一样的。如何检查二维数组中的对角线元素是否被占用?
这里是我的代码:
package main;
public class Board {
public static final int n = 8;
static boolean isSafe(boolean[][]board , int r, int c) {
int i;
int j;
for(i = 0; i < r; i++){
if(board[i][c] == true){
return false;
}
}
return true;
}
static boolean fillPositions(boolean [][]board, int r){
for(int c = 0; c < n; c++){
if(isSafe(board, r, c)){
board[r][c] = true;
if(r == (n - 1) || fillPositions(board, r+1)){
return true;
}
board[r][c] = false;
}
}
return false;
}
public static void main(String[] args){
boolean[][] board = new boolean[n][n];
if(fillPositions(board, 0)){
for(int i = 0; i < n; i++){
for(int j = 0; j < n; j++){
if(board[i][j]){
System.out.print("|Q");
} else {
System.out.print("|*");
}
}
System.out.println("|");
}
} else {
System.out.println("None");
}
}
}