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我正在嘗試用2D數組來完成nQueens拼圖問題。我無法檢查當前元素的對角元素是否被佔用?我試着做另一個for循環,但它只改變了下一行的輸出,其餘的都是一樣的。如何檢查二維數組中的對角線元素是否被佔用?
這裏是我的代碼:
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");
}
}
}