Java迷宫最短路径误解
Java Maze Shortest Path misunderstanding
这是代码,使用递归,我试图用最短路径解决迷宫问题,但它正在用更长的路径解决,我真的不明白为什么。这是递归代码:
public boolean findPath(int row, int col) {
board[row][col].visit();
if ((col == 7) && (row == 7)) {
board[row][col].selectCell();
return true;
}
if ((row > 0) && !board[row - 1][col].marked() &&
!board[row - 1][col].blocked() && !board[row - 1][col].visited()) {
block(row, col);
if (findPath(row - 1, col)) {
board[row][col].selectCell();
return true;
}
unblock(row, col);
}
if ((row < 7) && !board[row + 1][col].marked() &&
!board[row + 1][col].blocked() && !board[row + 1][col].visited()) {
block(row, col);
if (findPath(row + 1, col)) {
board[row][col].selectCell();
return true;
}
unblock(row, col);
}
if ((col > 0) && !board[row][col - 1].marked() &&
!board[row][col - 1].blocked() && !board[row][col - 1].visited()) {
block(row,col);
if (findPath(row, col - 1)) {
board[row][col].selectCell();
return true;
}
unblock(row,col);
}
if ((col < 7) && !board[row][col + 1].marked() &&
!board[row][col + 1].blocked() && !board[row][col + 1].visited()) {
block(row,col);
if (findPath(row, col + 1)) {
board[row][col].selectCell();
return true;
}
unblock(row,col);
}
return false;
}
它是 8x8 板,块功能是这样的:
public void block(int row, int col) {
if (row > 0) {
board[row - 1][col].block();
}
if (row < 7) {
board[row + 1][col].block();
}
if (col > 0) {
board[row][col - 1].block();
}
if (col < 7) {
board[row][col + 1].block();
}
}
当我尝试解决它时,它给了我这样的东西:
而不是:
如有任何帮助,我们将不胜感激!
试试这个,它应该可以直接完成:
public boolean findPath(int row, int col) {
board[row][col].visit();
if ((col == 7) && (row == 7)) {
board[row][col].selectCell();
return true;
}
if ((row < 7) && !board[row + 1][col].marked() &&
!board[row + 1][col].blocked() && !board[row + 1][col].visited()) {
block(row, col);
if (findPath(row + 1, col)) {
board[row][col].selectCell();
return true;
}
unblock(row, col);
}
if ((col > 0) && !board[row][col - 1].marked() &&
!board[row][col - 1].blocked() && !board[row][col - 1].visited()) {
block(row,col);
if (findPath(row, col - 1)) {
board[row][col].selectCell();
return true;
}
unblock(row,col);
}
if ((col < 7) && !board[row][col + 1].marked() &&
!board[row][col + 1].blocked() && !board[row][col + 1].visited()) {
block(row,col);
if (findPath(row, col + 1)) {
board[row][col].selectCell();
return true;
}
unblock(row,col);
}
if ((row > 0) && !board[row - 1][col].marked() &&
!board[row - 1][col].blocked() && !board[row - 1][col].visited()) {
block(row, col);
if (findPath(row - 1, col)) {
board[row][col].selectCell();
return true;
}
unblock(row, col);
}
return false;
}
您需要更改订单。
这是代码,使用递归,我试图用最短路径解决迷宫问题,但它正在用更长的路径解决,我真的不明白为什么。这是递归代码:
public boolean findPath(int row, int col) {
board[row][col].visit();
if ((col == 7) && (row == 7)) {
board[row][col].selectCell();
return true;
}
if ((row > 0) && !board[row - 1][col].marked() &&
!board[row - 1][col].blocked() && !board[row - 1][col].visited()) {
block(row, col);
if (findPath(row - 1, col)) {
board[row][col].selectCell();
return true;
}
unblock(row, col);
}
if ((row < 7) && !board[row + 1][col].marked() &&
!board[row + 1][col].blocked() && !board[row + 1][col].visited()) {
block(row, col);
if (findPath(row + 1, col)) {
board[row][col].selectCell();
return true;
}
unblock(row, col);
}
if ((col > 0) && !board[row][col - 1].marked() &&
!board[row][col - 1].blocked() && !board[row][col - 1].visited()) {
block(row,col);
if (findPath(row, col - 1)) {
board[row][col].selectCell();
return true;
}
unblock(row,col);
}
if ((col < 7) && !board[row][col + 1].marked() &&
!board[row][col + 1].blocked() && !board[row][col + 1].visited()) {
block(row,col);
if (findPath(row, col + 1)) {
board[row][col].selectCell();
return true;
}
unblock(row,col);
}
return false;
}
它是 8x8 板,块功能是这样的:
public void block(int row, int col) {
if (row > 0) {
board[row - 1][col].block();
}
if (row < 7) {
board[row + 1][col].block();
}
if (col > 0) {
board[row][col - 1].block();
}
if (col < 7) {
board[row][col + 1].block();
}
}
当我尝试解决它时,它给了我这样的东西:
而不是:
如有任何帮助,我们将不胜感激!
试试这个,它应该可以直接完成:
public boolean findPath(int row, int col) {
board[row][col].visit();
if ((col == 7) && (row == 7)) {
board[row][col].selectCell();
return true;
}
if ((row < 7) && !board[row + 1][col].marked() &&
!board[row + 1][col].blocked() && !board[row + 1][col].visited()) {
block(row, col);
if (findPath(row + 1, col)) {
board[row][col].selectCell();
return true;
}
unblock(row, col);
}
if ((col > 0) && !board[row][col - 1].marked() &&
!board[row][col - 1].blocked() && !board[row][col - 1].visited()) {
block(row,col);
if (findPath(row, col - 1)) {
board[row][col].selectCell();
return true;
}
unblock(row,col);
}
if ((col < 7) && !board[row][col + 1].marked() &&
!board[row][col + 1].blocked() && !board[row][col + 1].visited()) {
block(row,col);
if (findPath(row, col + 1)) {
board[row][col].selectCell();
return true;
}
unblock(row,col);
}
if ((row > 0) && !board[row - 1][col].marked() &&
!board[row - 1][col].blocked() && !board[row - 1][col].visited()) {
block(row, col);
if (findPath(row - 1, col)) {
board[row][col].selectCell();
return true;
}
unblock(row, col);
}
return false;
}
您需要更改订单。