原题链接:蓝桥杯2016年第七届真题-路径之谜
解题思路:
注意事项:
参考代码:
package 练习;
import java.util.*;
public class Main {
static Scanner sc = new Scanner(System.in);
static int n = sc.nextInt();
static int count = 0;
static ArrayList<Integer> ans = new ArrayList<>();
public static void main(String[] args) {
// int[] north ={2,4,3,4};
// int[] west = {4,3,3,3};
int[] north = new int[n];
int[] west = new int[n];
for (int i = 0; i < north.length; i++) {
north[i] = sc.nextInt();
}
for (int i = 0; i < west.length; i++) {
west[i] = sc.nextInt();
}
int[][] map = new int[n][n];
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
map[i][j] = count++;
}
}
dfs(map, 0, 0, north, west);
}
private static void dfs(int[][] map, int x, int y, int[] north, int[] west) {
boolean check = true;
if (x >= n || y >= n || x < 0 || y < 0) {
return;
}
for (int i = 0; i < n - 1; i++) {
if (north[i] != 0 || west[i] != 0) {
check = false;
}
}
if (north[n - 1] != 1 || west[n - 1] != 1) {
check = false;
}
for (int i = 0; i < n; i++) {
if (north[i] < 0 || west[i] < 0) {
return;
}
}
if (x == n - 1 && y == n - 1 && check == false) {
return;
}
if (x == n - 1 && y == n - 1 && check) {
ans.add(map[x][y]);
for (int i = 0; i < ans.size(); i++) {
System.out.print(ans.get(i) + " ");
}
System.exit(0);
}
west[x]--;
north[y]--;
ans.add(map[x][y]);
dfs(map, x, y + 1, north, west);
dfs(map, x + 1, y, north, west);
dfs(map, x - 1, y, north, west);
dfs(map, x, y - 1, north, west);
ans.remove(ans.size()-1);
west[x]++;
north[y]++;
}
}0.0分
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