编辑代码

#include <stdio.h>
#include <stdbool.h>

#define N 8

void print_solution(int board[N][N]) {
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < N; j++) {
            printf("%2d ", board[i][j]);
        }
        printf("\n");
    }
    printf("\n");
}

bool is_safe(int board[N][N], int row, int col) {
    // 检查当前位置是否安全
    for (int i = 0; i < row; i++) {
        if (board[i][col] == 1 ||               // 检查同一列
            (col - (row - i) >= 0 && board[i][col - (row - i)] == 1) ||   // 检查左上对角线
            (col + (row - i) < N && board[i][col + (row - i)] == 1)) {    // 检查右上对角线
            return false;
        }
    }
    return true;
}

bool solve_eight_queens(int board[N][N], int row) {
    if (row == N) {
        // 找到一种解决方案
        print_solution(board);
        return true;
    }

    bool result = false;

    for (int col = 0; col < N; col++) {
        if (is_safe(board, row, col)) {
            // 在当前位置放置皇后
            board[row][col] = 1;

            // 递归到下一行
            result = solve_eight_queens(board, row + 1) || result;

            // 回溯，尝试下一列
            board[row][col] = 0;
        }
    }

    return result;
}

void eight_queens() {
    int board[N][N] = {0};

    if (!solve_eight_queens(board, 0)) {
        printf("无解\n");
    }
}

int main() {
    eight_queens();

    return 0;
}